hp LaserJet 4200 4200n 4200tn 4200dtn 4200dtns 4200dtnsl service hp LaserJet 4300 4300n 4300tn 4300dtn 4300dtns 4300dtnsl
hp LaserJet 4200/4300 Series Printers Service
Copyright Information © Copyright Hewlett-Packard Company 2002 All Rights Reserved. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. Publication number: Q2431-90912 Edition 1, 08 2002 Warranty The information contained in this document is subject to change without notice. Hewlett-Packard makes no warranty of any kind with respect to this information.
Table of contents List of figures List of tables 1 Printer description Printer configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Model and serial numbers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Site requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Printer specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Printer operation Using the control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 Control-panel layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 Control-panel lights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 Control-panel buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37 Using the printer Help system . . . . . . . . .
Image-formation system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrostatic latent-image formation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Formatter system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PowerSave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Resolution Enhancement technology . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paper-pickup assembly, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .183 Main drive assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .186 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .188 Paper-feed belt assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .191 Tray 1 paper-pickup assembly . . . . . . . . . . . . . . . . . . . . . . . . . . .
Image-formation troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306 Print quality problems associated with media . . . . . . . . . . . . . . . . . . . . . . . 306 Overhead transparency defects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307 Print quality problems associated with the environment . . . . . . . . . . . . . . . 307 Print quality problems associated with jams . . . . . . . . . . . . . . . . . . . . . . . . 307 Image defects . . . . . .
viii Table of contents Q2431-90912
List of figures Figure 1. Printer physical dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 2. Sample cleaning page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Figure 3. Replacing the stapler unit (1 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 Figure 4. Replacing the stapler unit (2 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 54. Transferring the image. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 55. Fusing the image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 56. Cleaning the transfer charging roller and photosensitive drum . . . . . . . . . . . . . . . . Figure 57. Print cartridge memory chip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 58.
Figure 118. Laser/scanner (2 of 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 119. Laser/scanner (3 of 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 120. Laser/scanner (4 of 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 121. Print-cartridge motor (HP LaserJet 4300 series only; 1 of 2) . . . . . . . . . . . . . . . . . Figure 122.
Figure 182. 1,500-sheet feeder roller (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 183. 1,500-sheet feeder door (1 of 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 184. 1,500-sheet feeder door (2 of 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 185. 1,500-sheet feeder door (3 of 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 186.
Figure 246. Tray 2 lifter driver assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 247. Paper pickup assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 248. Paper-feed assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 249. Registration assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
xiv List of figures Q2431-90912
List of tables Table 1. Product configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Table 2. Printer weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 3. Power consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 4. Circuit requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 54. Print quality image defects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 55. Light print (partial page) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 56. Light print (entire page) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 57. Specks or dots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 58.
Table 115. Stacker and stapler/stacker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 116. Stacker and stapler/stacker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 117. Alphabetical pars list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 118. Numerical pars list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
xviii List of tables Q2431-90912
1 Printer description Contents Printer configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Model and serial numbers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Site requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Printer specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Physical dimensions. . . . . . . . . . . . . . . . . . . .
Environmental product stewardship program . . . . . . . . . . . . . . . . . . . Protecting the environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Energy consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Toner consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Paper use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Plastics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Printer configurations The HP LaserJet 4200/4300 series printer is available in a total of 12 models. Table 1.
Model and serial numbers The model number and printer serial number are listed on an identification label located under the top cover on the right side of the printer. The model number is alphanumeric, such as Q2431A for the HP LaserJet 4200/4300 products. The serial number contains information about the country/region of origin, the revision level, the production code, and the production number of the printer. An example of a serial number is USBB123456.
Site requirements The following environmental specifications must be maintained to ensure the correct operation of the printer. Consider the following points before installing the printer: ● Install in a well-ventilated, dust-free area. ● Install on a hard, flat, continuous surface, with all four printer feet level. Do not install on carpet or other soft surfaces. ● Make sure that adequate power is supplied. Printer circuit requirements are listed in table 4 on page 8.
Physical dimensions Maximum length with trays and rear output bin open HP LaserJet 4200/4200n/4200tn/ 4200dtn/4200dtns/4200dtnsL HP LaserJet 4300/4300n/4300tn/ 4300dtn/4300dtnsL 412 mm (16.2 inches) 1,045 mm (41.1 inches) HP LaserJet 4200/4200n/4300/4300n (top cover open) 547 mm (21.5 inches) HP LaserJet 4200tn/4200dtn/ 4300tn/4300dtn (top cover open) 670 mm (26.4 inches) 1,045 mm (41.1 inches) HP LaserJet 4200dtns/4200dtnsL/ 4300dtns/4300dtnsL 740 mm (29.1 inches) Figure 1.
Printer weights (without print cartridge) Table 2.
Table 4. Circuit requirements HP LaserJet 4200 series HP LaserJet 4300 series 110-volt models Power requirements 110 to 127 volt s(+/-10 percent) 220 to 240 volts (+/-10 percent) 50/60 Hz (+/-2 Hz) 50/60 Hz (+/-2 Hz) Rated short-term current for a typical 8.2 amps product 220-volt models 3.3 amps Table 5. Acoustic ratings Sound power level Declared per ISO 9296 Printing, 35 ppm (HP LaserJet 4200 series) LWAd= 6.8 bels (A) Printing, 45 ppm (HP LaserJet 4300 series) LWAd= 7.
Paper specifications HP LaserJet 4200/4300 printers produce excellent print quality. This printer accepts a variety of print media, such as cut-sheet paper (including recycled paper), envelopes, labels, transparencies, and custom-size paper. Paper properties such as weight, grain, and moisture content are important factors that affect printer performance and output quality. The printer can use a variety of paper and other print media in accordance with the following guidelines.
Supported sizes and weights of media Note The printer always prints at half speed from tray 1. The printer also prints at half speed from all other trays when printing on media sizes other than letter, legal, and A4. Table 7. Tray 1 Media specifications Size Dimensions1 Letter 216 by 279 mm (8.5 by 11 inches) A4 210 by 297 mm (8.3 by 11.7 inches) Legal 216 by 356 mm (8.5 by 14 inches) Executive 184 by 267 mm (7.3 by 10.5 inches) A5 148 by 210 mm (5.8 by 8.3 inches) B5 (ISO) 176 by 250 mm (6.
Table 7. Tray 1 Media specifications (continued) Labels Minimum: 76 by 127 mm (3 by 5 inches) Thickness: 0.127 to 0.229 mm (0.005 to 0.009 inch) 50 labels Maximum: 216 by 356 mm (8.5 by 14 inches) 1. The printer supports a wide range of sizes. Check the printer software for supported sizes. 2. Capacity can vary depending on paper weight and thickness, as well as environmental conditions. 3. All sizes can be stacked, but only letter, legal, and A4 can be stapled. Table 8.
Table 10. Duplex accessory media specifications Size Dimensions Letter 216 by 279 mm (8.5 by 11 inches) A4 210 by 297 mm (8.3 by 11.7 inches) Executive 184 by 267 mm (7.3 by 10.5 inches) Legal 216 by 356 mm (8.5 by 14 inches) B5 (JIS) 182 by 257 mm (7.2 by 10.1 inches) A5 148 by 210 mm (5.8 by 8.3 inches) Weight 60 to 120 g/m2 (16 to 32 lb) Table 11. Envelope feeder accessory Size Dimensions Monarch #7-3/4 98 by 191 mm (3.9 by 7.5 inches) Commercial#10 105 by 241 mm (4.1 by 9.
Table 12. Stacker or stapler/stacker accessory Size Dimensions1 Capacity2 Weight Stacker or stacker part of stapler/stacker only Letter 216 by 279 mm (8.5 by 11 inches) A4 210 by 297 mm (8.3 by 11.7 inches) Executive 184 by 267 mm (7.3 by 10.5 inches) Legal 216 by 356 mm (8.5 by 14 inches) B5 (JIS) 182 by 257 mm (7.2 by 10.1 inches) A5 148 by 210 mm (5.8 by 8.3 inches) Custom3 Minimum: 148 by 210 mm (5.8 by 8.
Supported types of media The printer supports the following types of paper and other print media: ● plain ● preprinted ● letterhead ● transparency ● prepunched ● labels ● bond ● recycled ● color ● card stock ● rough ● envelopes Guidelines for using paper For best results, use conventional 75- to 90-g/m2 (20- to 24-lb) paper. Make sure that the paper is of good quality, and free of cuts, nicks, tears, spots, loose particles, dust, wrinkles, voids, and curled or bent edges.
Paper weight equivalence table Use the following table to determine approximate equivalent points in weight specifications other than U.S. bond weight. For example, to determine the equivalent of 20-lb U.S. bond weight paper in U.S. cover weight, locate the bond weight (in row 3, second column) and scan across the row to the cover weight (in the fourth column). The equivalent is 28 lb. The shaded areas indicate a standard weight for that grade. Table 13. Paper weight equivalents U.S.
Labels Use tray 1 to print labels. Labels are multiple-layer media that typically consists of a face sheet (the printable surface), pressure-sensitive adhesive, and a liner (a carrier sheet coated with a release agent). Labels used in the HP LaserJet printer must be specifically designed for laser printers. If labels other than those compatible with laser printers are used, there is a significant risk of labels peeling or of adhesive contamination that can severely damage the printer.
Envelopes Envelope construction Envelope construction is critical. Envelope fold lines can vary considerably, not only between manufacturers, but also within a box from the same manufacturer. Successful printing on envelopes depends upon the quality of the envelopes. When selecting envelopes, consider the following components. Many envelope manufacturers are now making envelopes optimized for laser printers.
Envelope margins The following table gives typical address margins for a Commercial #10 or DL envelope. Hint Type of address Top margin Left margin Return address 15 mm (0.6 inches) 15 mm (0.6 inches) Delivery address 51 mm (2 inches) 89 mm (3.5 inches) For the best print quality, position margins no closer than 15 mm (0.6 inch) from the edges of the envelope. Envelope storage Proper storage of envelopes helps contribute to good print quality. Envelopes should be stored flat.
Types of print media to avoid The following characteristics can affect the performance of the HP LaserJet 4200/4300 printer unless the paper or other print media used is specifically designed to work with HP LaserJet printers. Note Q2431-90912 ● Print media that is very rough, highly textured, or heavily embossed. ● Multipart forms. ● Print media that offsets materials or discolors. ● Print media that is damaged, curled, wrinkled, or irregularly shaped. ● Paper that is extremely shiny or glossy.
Safety information Print cartridge and toner safety Handling and storage For information about handling and storing toner, see section 7 in the material safety data sheet (MSDS) at the http://www.hp.com/go/msds website. First aid measures For information about toner safety, see section 4 in the material safety data sheet (MSDS) at the http://www.hp.com/go/msds website. Clothing contact Note Toner can stain clothing.
EMI statement (Korea) VCCI statement (Japan) Q2431-90912 Chapter 1 Printer description 21
Laser statement (Finland) Luokan 1 laserlaite Klass 1 Laser Apparat HP LaserJet 4200 series, 4300 series laserkirjoitin on käyttäjän kannalta turvallinen luokan 1 laserlaite. Normaalissa käytössä kirjoittimen suojakotelointi estää lasersäteen pääsyn laitteen ulkopuolelle. Laitteen turvallisuusluokka on määritetty standardin EN 60825-1 (1994) mukaisesti.
Regulatory information FCC regulations This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy. If this equipment is not installed and used in accordance with the instructions, it may cause harmful interference to radio communications.
Environmental product stewardship program Protecting the environment Hewlett-Packard Company is committed to providing quality products in an environmentally sound manner. This product has been designed with several attributes to minimize impacts on our environment. Energy consumption Energy usage drops while in PowerSave mode, which saves natural resources and saves money without affecting the high performance of this product.
Material restrictions This HP product does not contain added mercury. This HP product contains lead in solder that might require special handling at end-of-life. This HP product does not contain batteries. For recycling information, you can contact http://www.hp.com/recycle, your local authorities, or the Electronics Industries Alliance at http://www.eiae.org. Material Safety Data Sheet Material Safety Data Sheets (MSDS) can be obtained by contacting the HP LaserJet Supplies website at http://www.hp.
Declarations of Conformity Declaration of Conformity according to ISO/IEC Guide 22 and EN 45014 Manufacturer’s Name: Hewlett-Packard Company Manufacturer’s Address: 11311 Chinden Boulevard Boise, Idaho 83714-1021, USA declares that the product Product Name: HP LaserJet 4200 series HP LaserJet 4300 series Regulatory Model Numbers: BOISB-0203-00 BOISB-0204-00 Product Options: ALL conforms to the following Product Specifications: 1) Safety: IEC 60950:1999 / EN 60950:2000 IEC 60825-1:1993+A1 / EN 608
2 Service approach Contents Service approach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Parts and supplies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Related documentation and software . . . . . . . . . . . . . . . . . . . . . . . . . 28 Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service approach Repair of the printer normally begins with the use of the printer’s internal diagnostics in conjunction with the troubleshooting procedures that are described in chapter 7. When a faulty part is located, repair is generally accomplished by assembly-level replacement of fieldreplaceable units (FRUs) (listed in chapter 8). Some mechanical assemblies might be repaired at the subassembly level. Hewlett-Packard does not support replacement of components on printed circuit boards.
HP provides free telephone support during the product warranty period. When you call, you will be connected to a responsive team waiting to help you. For the number you should call in your country/region, see the support sheet that came in the box with your printer. Before calling have the following information available: ● product name (for example, HP LaserJet 4300 dtns) ● product serial number (found on the underside of the control-panel door.
Worldwide service and support offices ● For the U.S., call (1) (208) 323-2551 Monday through Friday from 6 A.M. to 6 P.M., Mountain time. ● For Canada, call (1) (905) 206-4663 or (1) (800) 387-3867 Monday through Friday from 8 A.M. to 8 P.M., Mountain time. ● For customers outside of North America, use the following list and call the appropriate telephone number for the country/region.
Print-cartridge information The print cartridge is designed to simplify replacement of the major consumable parts. The print cartridge contains the printing drum and a supply of toner. At five-percent page coverage, a print cartridge prints approximately 12,000 pages (for the HP LaserJet 4200) or 18,000 pages (for the HP LaserJet 4300).
Hewlett-Packard limited warranty statement HP PRODUCT DURATION OF WARRANTY HP LaserJet 4200, 4200n, 4200tn, 4200dtn, 4200dtns, and 4200dtnsL 1 year from purchase date - return for repair HP LaserJet 4300, 4300n, 4300tn, 4300dtn, 4300dtns, and 4300dtnsL 1 year from purchase date - return for repair 1. HP warrants to you, the end-user customer, that HP hardware and accessories will be free from defects in materials and workmanship after the date of purchase, for the period specified above.
Limited warranty for toner cartridge life Note The warranty below applies to the print cartridge that came with this printer. This warranty supersedes all previous warranties. The HP print cartridge is warranted to be free from defects in materials and workmanship for the life of the cartridge until the HP toner is depleted. The HP toner is depleted when the printer indicates a toner-low message.
34 Service approach Q2431-90912
3 Printer operation Contents Using the control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Control-panel layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Control-panel lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Control-panel buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Using the printer Help system . . . . . . . . . . . . . . . . . . . . . . .
Using the control panel Control-panel layout The printer control panel consists of the following features: CANCEL JOB button UP ARROW button BACK ARROW button Ready light SELECT button Data light Attention light PAUSE/RESUME button Figure 2. Display DOWN ARROW button Printer online HELP button Control-panel layout Control-panel lights The control-panel lights provide information about printer status. Table 15.
Control-panel buttons The following table explains the function of each button on the printer control panel. Table 16. Control-panel buttons Button Function CANCEL JOB ● PAUSE/RESUME ● Cancels the print job that the printer is processing, clears the paper path, and clears any continuable errors that are associated with the canceled job. The time that it takes to cancel depends on the size of the print job. (Press the button only once.) When the printer is processing a print job, pauses the print job.
Settings and defaults The printer makes most printing decisions based on either temporary settings or permanent defaults. Note Settings sent from software applications override printer defaults. Table 17. Settings and defaults Note Setting or default Explanation Temporary setting A value that is set in the software program for the current print job. For example, a request from the software to print three copies instead of the control panel default value of one copy is a temporary setting.
Control-panel menus Overview Most routine printing tasks performed by the printer come from a computer using an application program or a printer driver. These two methods are the most convenient way to control the printer, and they override the printer control-panel settings. See the Help file for your program for more information. Printer settings can also be changed by using the printer control panel.
To change a control-panel setting 1. Press the SELECT ( ) button to open the menus. 2. Use the UP ARROW ( ) button or the DOWN ARROW ( want, and then press the SELECT ( ) button. ) button to scroll to the menu that you 3. Some menus might have several submenus. Use the UP ARROW ( ) button or the DOWN ARROW ( ) button to scroll to the submenu item that you want, and then press the SELECT ( ) button. 4.
Retrieve Job menu This menu supplies a list of the jobs stored in the printer and provides access to the Job Storage feature. You can print or delete these jobs at the printer control panel. Note If you turn the printer power off, all stored jobs are deleted unless an optional hard disk is installed. Table 18. Retrieve job menu Item Values Explanation NO STORED JOBS No stored job. Indicates that there are no stored jobs to print or delete.
Paper Handling menu If paper-handling settings are correctly configured at the printer control panel, you can print by selecting the type and size of paper in the software program or the printer driver. For more information about configuring for paper types and sizes, and information about supported paper types and sizes, see “Supported sizes and weights of media” on page 10 and “Supported types of media” on page 14.
Table 20. Paper-handling menu (continued) Q2431-90912 Item Values Explanation TRAY [N] TYPE ANY Automatically detects the standard media size currently *PLAIN loaded in the specified tray, where [N] is the number of PREPRINTED the tray.
Configure Device menu This menu contains administrative functions in the following submenus:. ● Printing submenu • PCL submenu ● Print quality submenu ● System setup submenu ● Stapler/stacker submenu ● I/O submenu Printing submenu Some items on this menu are available in the software program or the printer driver (if the appropriate driver is installed). Program and printer-driver settings override control-panel settings.
Table 21. Printing submenu (continued) Item Values Explanation OVERRIDE A4/ LETTER *NO YES Use this item to instruct the printer to print an A4-size job on letter-size media if A4-size paper is not loaded in the printer (or vice versa). MANUAL FEED *OFF ON Use this item to instruct the printer to feed the media manually from tray 1, rather than automatically from a tray. If MANUAL FEED=ON and tray 1 is empty, the printer goes offline when it receives a print job.
Table 22. PCL submenu (continued) Item Values Explanation SYMBOL SET *PC-8 Several Use this item to select any one of several available symbol sets at the printer control panel. A symbol set is a unique grouping of all the characters in a font. PC8 or PC-850 is recommended for line-draw characters. APPEND CR TO LF *NO YES Select YES to append a carriage return to each line feed that is encountered in backward-compatible PCL jobs (pure text, no job control).
Table 23. Print quality submenu (continued) Item Values Explanation FUSER MODES [Paper Type]= Use this item to configures the fuser mode associated with each media type. PLAIN PREPRINTED LETTERHEAD TRANSPARENCY PREPUNCHED LABELS BOND RECYCLED COLOR CARDSTOCK>164 G/M2 ROUGH NORMAL LOW HIGH1 HIGH2 ENVELOPE RESTORE MODES Change the fuser mode only if you are experiencing problems printing on certain types of media.
Table 23. Print quality submenu (continued) Item Values Explanation RET OFF LIGHT *MEDIUM DARK Use the Resolution Enhancement technology (REt) setting to produce print with smooth angles, curves, and edges. REt does not affect print quality if the print resolution is set to FastRes 1200. All other print resolutions benefit from REt. Note It is best to change the REt setting in the software program or the printer driver. (Program and printer-driver settings override control-panel settings.
System Setup submenu Items on this menu affect printer behavior. Configure the printer according to your printing needs. The following section lists the settings and their possible values in the System Setup submenu. The default value for each setting is the one that has an asterisk (*) next to it. Table 24. System setup submenu Item Values Explanation JOB STORAGE LIMIT 1 to 100 (*32) Use this item to specify the number of quick copy jobs that can be stored on the printer.
Table 24. System setup submenu (continued) Item Values Explanation CLEARABLE WARNINGS *JOB ON The amount of time that a clearable warning is shown on the printer control-panel display. JOB: The clearable warning message appears until the end of the job that generated the message. ON: The clearable warning message appears until you press the SELECT ( ) button. AUTO CONTINUE OFF *ON Use this item to tell the printer how to react to errors.
Table 24. System setup submenu (continued) Item Values Explanation RAM DISK OFF *AUTO Use this item to configure the RAM disk. OFF: The RAM disk is disabled. AUTO: The printer determines the optimal RAM-disk size based on the amount of available memory. Note If you change the setting from OFF to AUTO, the printer automatically reinitializes when it becomes idle. *ENGLISH (Selections are available depending on the installed fonts.
I/O submenu Items on the I/O (input/output) menu affect the communication between the printer and the computer. The contents of the I/O submenu depend on which EIO card is installed. The following section lists the settings and their possible values in the I/O submenu. The default value for each setting is the one that has an asterisk (*) next to it. Table 26. I/O submenu Item Values Explanation I/O TIMEOUT 5 to 300 (*15) Select the I/O timeout period in seconds.
4 Printer maintenance Contents Cleaning the printer and accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Cleaning the fuser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Running the cleaning page manually . . . . . . . . . . . . . . . . . . . . . . . . . 56 To run the cleaning page manually . . . . . . . . . . . . . . . . . . . . . . . . 56 Running the cleaning page automatically . . . . . . . . . . . . . . . . . . . . . .
Cleaning the printer and accessories To maintain superior print quality and performance, thoroughly clean the printer and the paperhandling accessories: ● every time you change the print cartridge. ● after printing approximately 10,000 pages. ● whenever print-quality problems occur. Clean the outside surfaces of the printer and accessories with a water-dampened cloth. Clean the inside parts as indicated in “Cleaning the printer” on page 55.
Table 27. Cleaning the printer Component Cleaning method/notes Outside covers Use a water-dampened cloth. Do not use solvents or ammonia-based cleaners. Inside With a dry, lint-free cloth, wipe any dust, spilled toner, and paper particles from the paper-path area, the registration roller, and the print cartridge cavity. Do not touch the transfer roller with bare hands. Paper-pickup, feed, and separation rollers Use a water-dampened, lint-free cloth. Tray 1 separation pad Use a dry, lint-free cloth.
Running the cleaning page manually In order for the cleaning page to work properly, print the page on copier-grade paper (not bond, heavy, or rough paper). Hint If you have an optional duplexer installed, this cleaning method is the only one you can use. To make sure that automatic cleaning option is not selected. To ensure good print quality, run the cleaning page every time the print cartridge is replaced.
Running the cleaning page automatically Use the following procedure to set the printer to print cleaning pages automatically at an interval that you select. In order for the cleaning page to run without intervention, you must keep the selected size and the plain paper type available in the printer. The printer will not interrupt a printing job in process to run a cleaning page.
Performing preventative maintenance You should replace certain parts when the PERFORM PRINTER MAINTENANCE message appears on the printer control-panel display. This helps your printer maintain optimum performance. The maintenance message appears every 200,000 pages. The message can be temporarily cleared for approximately 10,000 pages using the CLEAR MAINTENANCE MESSAGE item on the Resets submenu. (See “Control-panel menus” on page 247.
Expected life of components The following table shows the expected life of certain components in the printer. To order parts, see chapter 8. Table 29.
Maintaining the stapler unit Removing and replacing the stapler unit Use this procedure to replace a defective stapler unit in the optional stapler/stacker. To remove and replace the stapler unit 1. Locate the stapler unit on the right side of the stapler/stacker. 2. Rotate the stapler unit toward the front of the printer until the unit clicks. Hold the stapler unit in this open position. 3. Push down on the tab at the top of the stapler unit. 4.
6. Remove the new stapler unit from its packaging. 7. Connect the cable on the new stapler unit to the stapler/stacker. 8. Place the pivot pin that is located on the bottom of the new stapler unit into the hole in the stapler/stacker (located in the cavity that was created when the staple unit was removed earlier in this procedure). 9. Press down on the tab at the top of the stapler unit and push the unit into the stapler/stacker. 10.
Loading staples Load staples if the printer control panel display prompts you with a STAPLER LOW ON STAPLES message (the staple cartridge contains fewer than 70 staples) or a STAPLER OUT OF STAPLES message (the staple cartridge contains 15 or fewer staples). For more information see “Staple level detection” on page 116. Once the stapler runs out of staples, jobs may continue to print to the stapler/stacker (if STAPLES OUT = CONTINUE), but they will not be stapled.
Downloading a remote firmware update Note Not all HP LaserJet 4200/4300 printers support remote firmware updates. A remote firmware update (RFU) can be downloaded from http://www.hp.com/go/lj4200_firmware or http://www.hp.com/go/lj4300_firmware. The RFU file on the website is a self-extracting .EXE file. Downloading a RFU is similar to downloading printing-system software and printer drivers. These web sites also features an “E-mail me when new software is available” link.
64 Printer maintenance Q2431-90912
5 Theory of operation Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Basic operation of the printer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Printer operating sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Control system overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 Pickup and feed system overview . . . . . . . . . . . . . . . . . . . . . . . . .
Envelope feeder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 Envelope feeder pickup and feeding . . . . . . . . . . . . . . . . . . . . . . . 96 Envelope feeder jam detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 Envelope feeder pickup delay jam . . . . . . . . . . . . . . . . . . . . . . . . 97 Envelope feeder pickup stationary jam . . . . . . . . . . . . . . . . . . . . . 97 Duplexer . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction This chapter presents an overview of the relationships between major components in the printer. It also provides a general description of the following: ● Basic operation of the printer ● Power supply ● Laser/scanner assembly ● Image formation ● Paper pickup and feeding ● 500-sheet feeder operation ● 1,500-sheet feeder operation ● Envelope feeder ● Duplexer ● Stacker and stapler/stacker Basic operation of the printer Printer operation can be divided into four systems.
Control system overview The control system consists of the power supply and the DC controller PCA. It controls the pickup and feed, laser/scanner, and image formation systems. The microprocessor on the DC controller PCA controls the operating sequence of the printer. When the printer power is in the standby sequence (see table 30 on page 67), direct current power (dc voltage) is supplied to the DC controller PCA by the power supply.
General descriptions This section describes individual components found in the printer. Information is provided about the following components. ● DC controller PCA ● 500-sheet feeder ● Power supply assembly ● 1,500-sheet feeder ● Pickup and feed assembly ● envelope feeder ● Laser/scanner assembly ● Duplexer ● Image formation system ● Stacker and stapler/stacker DC controller PCA The DC controller PCA controls the operation of the printer and its components.
Motor and fan control The HP LaserJet 4200 printer has three dc brushless motors. The main motor, the lifter driver motor (inside of the lifter driver assembly), and a fan motor. The main motor is used for image formation (rotating the photosensitive drum in the print cartridge) and paper pickup and feed. The lifter motor raises the plate in the tray cassette. The fan motor rotates the fan blades. The HP LaserJet 4300 printer has five dc brushless motors.
Power supply The power supply consists of the fuser-control circuit, the high-voltage circuit, and the lowvoltage circuit. The fuser-control and high-voltage circuits control the temperature of the fuser and generate high-voltage according to signals from the DC controller PCA. The low-voltage circuit generates the dc voltages used by other components in the printer (for example the DC controller PCA, the motors, and fans). Figure 7.
Fuser over-temperature protection The fusing heater safety circuit is located on the power supply and constantly monitors the fusing temperature. To protect the fuser from excessive temperatures, the printer has the following three protective functions: ● The CPU monitors the voltage of the thermistor. If the fuser temperature reaches 240° C (464° F) or higher, the CPU turns off the relay (RL101) to interrupt the power to the fusing heater.
High-voltage circuit The high-voltage circuit produces the voltage biases that are applied to the primary charging roller, the developing cylinder, the transfer charging roller, and the pressure roller. Figure 10. High-voltage circuit block diagram The primary charging voltage (bias) applies a uniform negative charge to the photosensitive drum in the print cartridge. There are two types of primary charging biases. The primary charging dc negative voltage and the primary charging ac bias.
The developing voltage (bias) causes the toner to adhere to the electrostatic image that the laser/scanner assembly created on the photosensitive drum. There are two types of developing biases. The developing dc negative bias and the developing ac bias. Both biases are generated by the high-voltage circuit on the power supply. These biases are superimposed on one another and then applied to the primary charging roller which will transfer the biases to the drum.
Overcurrent/overvoltage protection If a short-circuit or other problem on the load side causes an excessive current flow or generates abnormal voltage, the overcurrent/overvoltage protection systems automatically cut off the output voltage to protect the power supply circuit. If the overcurrent or overvoltage protection system are activated and the power supply circuit does not generate dc voltage, it is necessary to turn the power off, correct the problem, and then turn the printer on again.
Laser/scanner assembly The laser/scanner produces the latent electrostatic image on the photosensitive drum in the print cartridge.The main components of the laser/scanner assembly are the laser driver PCA, the scanner motor, various mirrors, and the focusing lenses. Scanner motor PCA Scanner motor Scanner mirror BD PCA Focusing lens BD mirror Mirror Photosensitive drum (inside the print cartridge) Laser beams Figure 12.
Laser/scanner control The laser/scanner control circuit on the laser driver PCA turns the laser diodes on an off according to image data signals received from the DC controller PCA. The DC controller PCA sends image data signals VD01/VD01,VD02, and /VD02 and the laser control signals CNT0, CNT1, and CNT2 to the logic circuit on the laser driver PCA. The laser control signals control laser emission, automatic power control (APC), horizontal synchronization control, and image mask control. Figure 13.
Paper pickup system The paper pickup and feed system consists of various kinds of pickup and feed rollers that are driven by the printer’s motor(s). The printer uses tray 1 (the manual feeding tray) and a cassette in tray 2 as media sources. The printed media is delivered to either the rear output bin (straight through printing) or the top output bin (the default destination). Two additional 500-sheet feeders and one 1,500-sheet feeder can be added to the printer.
The paper pickup and feed system is divided into two blocks. The paper pickup/feed block, and the fuser/delivery block. Fuser/delivery block Paper pickup/feed block Figure 15. Paper pickup/feed and fuser/delivery block diagram Paper pickup and feed block The printer functions that take place in the pickup/feed block are cassette media size and presence detection, media entering the paper path from tray 1 or tray 2, Lifting of the tray 2 paper plate, multiple feed prevention, and page skew correction.
Printing from tray 1 The presence of paper in tray 1 is detected by the tray 1 paper sensor (PS105). When the DC controller PCA receives the print command, the printer starts the initial rotation phase. (This consists of main motor warm-up, scanner motor warm-up, high-voltage control sequence and fuser warm-up.) When the initial rotation phase ends, the tray 1 pickup solenoid (SL102) is activated. The cam rotates, the paper tray lifter rises, and the media comes in contact with the tray 1 pickup roller.
Separation pad Tray 1 pickup roller Tray 1 pickup solenoid Cam Lifter Figure 17.
Printing from tray 2 When the DC controller PCA receives print command, the main motor (M101) and scanner motor start rotation. When the main motor reaches its prescribed speed, the feed roller clutch (CL101) and tray 2 pickup solenoid (SL101) are activated. (The tray 2 pickup roller, tray 2 feed roller, tray 2 separation roller, and paper feed rollers are driven by the main motor rotation.) The tray 2 pickup roller, activated by the pickup solenoid, rotates once and picks up the media in the tray.
Tray 2, 500-, 1,500-sheet feeder media size detection Media size in the cassette are detected by three switches. The switches are active after the cassette is placed in the tray 2 feeder. (this also applies to the optional 500- and 1,500-sheet feeder). The DC controller PCA microprocessor detects the size and presence of the media by the combinations of the switches. Table 32.
Lifter-driver operation The lifter driver keeps the media stack surface at a specific level in order to have a stabilized pickup operation regardless of the size of the media in the tray 2 cassette. The DC controller PCA operates the lifter driver motor (M103) for 50 seconds. The motor stops when the paper stack position sensor (PS107) detects the media.
Media skew prevention The printer uses a registration shutter on the registration assembly to prevent media from entering the printer skewed (without decreasing the throughput speed). When media is fed to the registration assembly its leading edge contacts the registration shutter, but does not yet open the shutter. The feed roller continues to rotate and the media begins to sag.
Fixing/delivery block The paper pickup and feed system is divided into two blocks. The paper pickup tray to the fuser block, and the fuser to output bin block. Fuser/delivery block Paper pickup/feed block Figure 21. Paper pickup/feed and fuser/delivery block diagram The fuser/delivery block consists of the various rollers, sensors, the fuser, and the output delivery assembly. The rollers transport the media through the fuser/delivery block paper path.
Printer jam detection The printer uses the following sensors to detect the presence of media and to verify if the media is being fed properly or has jammed. For information about the location of these sensors, see “Printer switches and sensors” on page 336. ● Pre-fed sensor (PS102) ● Top of page sensor (PS103) ● Fuser delivery sensor (PS108) The microprocessor on the DC controller PCA checks for media jamming by timing the passing of the media as it moves past these sensors.
Printer delivery wrap jam when feeding regular media Regular size media is defined as A4, letter, legal, B5, executive or A5. If the fuser delivery sensor (PS108) does not detect the trailing edge of the media after a specified fusing time the microprocessor on the DC controller PCA determines there is a fuser wrap jam. The transport process is stopped and a 13.XX.YY JAM message appears on the control-panel display.
Printer door open jam If the top door is opened (this will activate the top door open switch; SW101) during a print operation, the microprocessor on the DC controller PCA determines there is door open jam. The transport process is stopped and a 13.XX.YY JAM message appears on the control-panel display. For more information about jam messages, see “Alphabetical printer messages” on page 258 and “Numerical printer messages” on page 274.
Printing from the 500-sheet feeder Note The HP LaserJet 4200/4300 series printers support up to two optional 500-sheet feeders. The paper-feeder driver controls the operation sequences of the 500-sheet feeder. An 8-bit microprocessor in the paper-feeder driver controls the 500-sheet feeder sequences and the communication with the DC controller PCA. The paper-feeder driver drives the solenoid in response to the pickup command.
The pickup roller, activated by the solenoid, rotates once, picking up the media inside the 500sheet tray. The separation roller removes any unnecessary sheets and the media travels to the pre-feed sensor (PS102). The sheet then reaches the registration assembly, where its skew is corrected. Then it goes through transfer, separation, and fusing stages; passes through the delivery unit; and is delivered to the output bin. Note Figure 23.
Printing from the 1,500-sheet feeder The paper-feeder driver controls the operation sequences of the 1,500-sheet feeder. An 8-bit microprocessor in the paper-feeder driver controls the 1,500-sheet feeder sequences and the communication with the DC controller PCA. The paper-feeder driver drives the solenoid in response to the pickup command. The paperfeeder driver also returns the status of the paper feeder to the DC controller PCA.
Figure 25.
1,500-sheet feeder lifting mechanism The lifting mechanism maintains the media stack surface at a specific position inside the 1,500sheet feeder. This allows the feeder to perform a stabilized pickup operation regardless of the size of the media loaded in the feeder. The lift plate inside of the feeder is lifted by two wire cables. A motor (M1) winds these wires up using pulleys in the feeder.
Envelope feeder The envelope-feeder driver controls the operation sequences of the envelope feeder. An 8-bit microprocessor in the envelope feeder driver controls the envelope-feeder sequence and the communication with the DC controller PCA. The DC controller PCA sends the pickup command to the envelope-feeder driver with the necessary timing. The envelope-feeder driver activates the solenoid in response to the command.
Envelope feeder pickup and feeding In the envelope feeder, the envelope sensor (PS901) detects the presence of envelopes and the envelope-size sensor (PS903) detects the width of the envelope. The envelope pickup motor (M901) drives all of the rollers in the envelope feeder. When the DC controller PCA sends a print command the main motor (M101) in the printer begins to rotate. After the main motor initial rotation phase is completed, the scanner motor begins to rotate.
Envelope feeder jam detection The envelope feeder uses the envelope multiple feed sensor (PS902) along with sensors in the printer to detect the presence of media and to determine whether the media is feeding properly or is jamming. If a jam occurs in the envelope feeder, the error message 13.XX.YY appears on the control-panel display. For more information see “Numerical printer messages” on page 274.
Duplexer The duplexer driver controls the operation of the duplexer. An 8-bit microprocessor in the duplexer driver controls the duplexer sequence and the communication with the DC controller PCA. The duplexer driver drives the solenoid, motors, and fan according to commands that the DC controller PCA sends to the duplexer. The duplexer also communicates its status to the DC controller PCA. The printer delivers a charge of +24 vdc to the duplexer, which then generates +5 v for the integrated circuits.
Reversing and duplexer pickup The duplexer has two stepping motors: the reversing motor (M701) and the duplex feed motor (M702). The duplexer driver controls forward and reverse rotations of the motor. The face-up output tray diverter, which is controlled by the duplexer solenoid, feeds print media to the duplexer. Note The duplexer cannot be used if the face-up tray is open,. When the trailing edge of the media passes the reverse sensor (PS703), the reversing motor changes direction.
Duplexer jam detection The following paper sensors detect whether or not the print media is present and is feeding normally.
Stacker and stapler/stacker The stacker delivers media from the printer to the stacker delivery bin. The stapler/stacker staples the media together, and then delivers it to the stapler/stacker delivery bin. The DC controller PCA controls the stacker and stapler/stacker. When the stacker or stapler/stacker feeds, the DC controller PCA sends page information (for example, the paper size or whether the page is the first or last page of the job) to the stacker or stapler/stacker. Stacker Figure 31.
The following diagram illustrates the power-on sequence for the stacker and stapler stacker. Figure 32.
Stacker The DC controller PCA controls the stacker and sends signals to the stacker driver PCA. The stacker driver PCA then controls the operation of the stacker components like the stacker motor, solenoid, and sensors. When the printer power is turned on, dc power from the printer’s lowvoltage supply circuit is supplied to the stacker. The stacker performs the power-on sequence (see figure 32 on page 102) and enters the standby mode.
Stacker feed and delivery The stacker feed and delivery system consists of several feed rollers and guides that the stacker motor and solenoids drive. Sensors along the stacker paper path detect the arrival and passing of media and confirm the position of the jogger guide. The jogger guide helps to align the pages before placing them in the delivery bin. Table 34.
Stacker jam detection The stacker uses the following sensors to detect the presence of media and to verify whether the media is feeding correctly or is jamming. For information about the location of these sensors, see “Stacker and stapler/stacker switches and sensors” on page 345.
Stapler/stacker The DC controller PCA controls the stapler stacker by sending signals to the stapler/stacker driver PCA. The stapler/stacker PCA controls the stapler/stacker motor, solenoids, sensors, and the stapler unit. When the printer power is turned on dc power from the printer’s low-voltage supply circuit is supplied to the stapler/stacker. The stapler/stacker performs the power on sequence (see figure 32 on page 102) and enters the standby mode.
Stapler/stacker feed and delivery The stapler/stacker feed and delivery system consists of several feed rollers and guides that are driven by the stapler/stacker motors and solenoids. Sensors along the stapler/stacker paper path detect the arrival and passage of media and confirm the position of the jogger guide. The jogger guide helps to align the pages before stapling and dropping them into the delivery bin. The stapler/stacker has two modes.
Figure 36.
Staple mode feed and delivery In this mode, two to fifteen pages of media are stapled into one set and the stacks are then delivered to the delivery bin. After the leading edge of the media reaches the fixing delivery sensor (PS108) in the printer the DC controller PCA sends a signal to the stapler/stacker driver PCA.
The jogger guide motor (M1101) moves the jogger guides to the waiting position, and the stapler/ stacker driver PCA again activates the paddle motor (M1101) counterclockwise to engage the upper and lower delivery rollers. Jogger guides Upper delivery roller Lower delivery roller Waiting position Stapler/stacker Turn-out position Printer Media Figure 38.
At a specific time after the paper inlet sensor (PS1101) detects the trailing edge of the media, the stapler/stacker driver PCA activates the clamp solenoid (SL1102). The clamp keeps the page from being pushed out of position by the pages that follow. Jogger guides Upper delivery roller Lower delivery roller SL1102 PS1101 Waiting position Figure 40. Staple mode feed and delivery diagram (4 of 6) The stapler/stacker now operates according to the following conditions.
After the pages are stapled, the stapler/stacker driver PCA activates the feed motor (M1103; counterclockwise) to again engage the upper and lower delivery rollers. The stapled stack is moved all of the way out onto the jogger guides. The stapler/stacker driver PCA activates the jogger motor (M1102) to move the jogger guide into the turn-out position and allow the stack to drop into the delivery bin. Jogger guide moves into the turn-out position Jogger guide Stapled media Drop Figure 42.
Stapler unit The major components of the stapler unit are the stapler motor (M104), the staple cartridge, the staple-detection switch, and the staple-module home-position switch. The staple cartridge holds a maximum of 1,000 staples. The stapler/stacker driver PCA controls the stapler unit. Stapler unit Stapler/stacker Figure 44.
Stapler unit operation The stapler unit uses the stapler unit motor (M104), staple cam, staple press head plates, staple arm, and support base to staple media together. The staple mode is enabled by using the printer’s settings (see “Stapler/stacker submenu” on page 51). The stapling procedure begins when media enters the staple guide and the DC controller PCA sends the end-of-job signal to the stapler/stacker driver PCA.
As staple cam 1 rotates, it raises the staple press head plate 1. This forms the flat staple into a “u” shape. While this is happening, the staple arm raises the swing guide. Staple Side view Figure 47. Front view Staple operation (2 of 3) As staple cam 2 rotates, it raises staple press head plate 2. This pushes the staple up and through the media.
Staple level detection The stapler/stacker driver PCA uses the staple-detection switch to detect the presence and number of staples in the stapler unit. A spring on the staple-detection switch holds the stapledetection flag in the raised position. When this flag is fully raised, the switch is open. There is a slot cutout in the bottom of the staple cartridge.
Stapler/stacker jam detection The following sensors detect the presence of media in the stapler/stacker and determine whether the media is feeding properly or jamming. For information about the location of these sensors, see “Stacker and stapler/stacker switches and sensors” on page 345.
Image-formation system The image-formation system is the main system in the printer. It consists of five stages: ● Electrostatic latent (potential) image formation During this operation a uniform negative charge is applied to the surface of the photosensitive drum in the print cartridge. The drum is then exposed to the laser beam from the laser/scanner which neutralizes portions of the drum to create the electrostatic latent image, which is invisable. ● Developing the image Toner is applied to the drum.
Figure 50.
Electrostatic latent-image formation Forming the electrostatic latent image on the photosensitive drum requires applying a uniform negative charge (bias) to the surface of the drum and then the exposing it to the laser beam. The laser beam naturalizes the section of the drum so that it attracts toner during the developing operation. Primary charging The conditioning process consists the primary charging roller applying a uniform negative charge on the surface of the drum.
Writing the image The laser/scanner contains two diodes in the laser unit. During the writing process, the modulated laser diodes project two beams onto the rotating six-sided scanning mirror. As the mirror rotates, the beams reflect off the mirror, through a set of focusing lenses, through a slot in the top of the toner cartridge, and onto the photosensitive drum. The beams sweep the drum from left to right, discharging the negative potential wherever the beams strike the surface.
Developing the image The developing process makes the latent electrostatic image a visible image on the drum. The developing unit consists of a metallic cylinder that rotates around a fixed magnetic core inside the toner cavity. Toner is a powdery substance made of black plastic resin bound to iron particles, which is uniformly attracted to the magnetic core of the cylinder.
Transferring the image During the transferring process the toner image on the drum surface is transferred to the paper. A positive charge that the transfer roller applies to the back of the media causes the negatively charged toner on the drum surface to be attracted to the sheet of media. The small diameter of the drum, combined with the stiffness of the paper, causes the paper to peel away from the drum. The static eliminator teeth also help separate the paper from the drum.
Fusing the image The image is only held in place by electrostatic attraction when it is transferred from the drum to the media. The lightest touch will smear it. During the fusing process, heat and pressure fuse the image to the media to produce a permanent image. The media passes between a heated fusing roller and a soft pressure roller. This melts the toner and presses it into the media. This printer utilizes an on-demand fusing method.
Cleaning the transfer charging roller and photosensitive drum Residual (left over) toner is cleaned off of the transfer charging roller and photosensitive drum so that subsequent images are crisp and clear. Because not all of the toner is attracted to the media when the image is transferred from the drum, some toner remains on the drum. Toner may also remain on the transfer roller if a jam occurs and the transfer of toner to the media operation is not completed.
Print cartridge memory chip The print cartridge memory chip is a non-volatile memory device built into the print cartridge. It stores information about the cartridge. The DC controller PCA reads and writes memory data to the memory chip to monitor the print cartridge usage and condition. The DC controller PCA reads and writes to the memory chip at specific times. If the read-write process fails four times in a row, the DC controller PCA detects a print cartridge memory failure and a 10.00.
Formatter system The formatter is responsible for the following procedures: ● Controlling the PowerSave mode ● Receiving and processing print data from the various printer I/Os ● Monitoring control panel functions and relaying printer status information (through the control panel and the bidirectional I/O) ● Developing and coordinating data placement and timing with the DC controller PCA ● Storing font information ● Communicating with the host computer through the bidirectional interface The for
EconoMode The EconoMode setting uses up to 50 percent less toner than standard mode printing by reducing the dot density. However, EconoMode does not extend the life of toner cartridge components. EconoMode, which can be thought of as “draft mode,” can be selected from the control panel (print-quality menu) and through some software applications and printer drivers. The default setting is OFF. CAUTION HP does not recommend full-time use of EconoMode.
Printer memory If the printer encounters difficulty managing available memory, a clearable warning message appears on the control panel. Some printer messages are affected by the auto-continue and clearable warning settings from the configuration menu on the printer control panel. If CLEARABLE WARNING=JOB is set on the control panel, warning messages appear on the control panel until the end of the job from which they were generated.
PJL overview Printer job language (PJL) is an integral part of configuration, in addition to the standard printer command language (PCL). With standard cabling, PJL allows the printer to perform functions such as: ● Two-way communication with the host computer through a bidirectional parallel connection. The printer can tell the host about such things as the control panel settings, and it allows the control panel settings to be changed from the host.
6 Removing and replacing parts Contents Removal and replacement strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 Required tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 Before performing service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 After completing service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133 Screws used in the printer . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tray 1 paper-pickup assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Paper feed assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Registration assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transfer assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500-sheet feeder assembly . . . . . . . . .
Removal and replacement strategy This chapter describes how to remove, replace, and reassemble the major assemblies of the printer. Replacement is generally the reverse of removal. To identify the left side and right side of the printer, face tray 1 on the front of the unit. WARNING! Unplug the power cord from the power outlet (at the wall receptacle) before attempting to service the product. If you do not follow this warning, severe injury can result.
Screws used in the printer This table describes the screws used in the printer and provides guidelines to help determine where each type of screw is used. The screws can vary in length depending on the thickness of the material that is being fastened. Always note where each type of screw is located and replace each one in its original location. Hint When you are disassembling the product, place the screws into the chassis holes from which they were removed.
Parts-removal tree Use the following diagram to determine the order in which parts must be removed. Print cartridge Transfer roller Note Control-panel overlay Tray 1 Tray 2 feed rollers Rear output bin Some components in the parts-removal tree have a superscript number listed next to the component name (for example, “Right-side cover1”). The superscript indicates that this component must be removed to gain access to the transfer assembly and to the registration roller assembly.
Printer input tray, and cabinet wheel locks When the printer and input trays are placed on the cabinet stand, the printer and trays must be locked together to prevent them from tipping over. This is not necessary (but it is recommended) if the printer and trays are placed on a level work surface. When servicing the printer and accessories, unlatch the locking mechanism and separate the printer and its accessory components. The cabinet stand includes lock for the wheels at its base.
User-replaceable parts Print cartridge 1. Open the control-panel door. Figure 59. Print cartridge (1 of 2) 2. Firmly grasp the print cartridge and pull it up and out of the printer. CAUTION Figure 60. Q2431-90912 Do not expose the print cartridge to bright light or direct sunlight for long periods of time. This can damage the cartridge, which will result in print-quality defects.
Transfer roller 1. Open the control-panel door and tray 1. CAUTION Do not touch the black rubber on the roller. Skin oils on the roller can cause print-quality problems. The use of disposable gloves is recommended when you remove the transfer roller. 2. Use a flat-blade screwdriver to lift the left end of the metal shaft out of place near the blue gear. Slide the transfer roller to the left to remove it. Figure 61.
Tray 1 pickup roller Note If the optional envelope feeder accessory is installed, press the release button that is on the left side and remove it. Then proceed to step 2. 1. Remove the front accessory cover (callout 1). 1 Figure 62. Tray 1 pickup roller (1 of 2) 2. Release the pickup roller by sliding apart the latches that are located on each side at the top of the roller. Lift the roller out of the opening. 2 Figure 63.
Tray 1 separation pad Note If the optional envelope feeder accessory is installed, press the release button that is on the left side and remove it. Then proceed to step 2. 1. Remove the front accessory cover (not shown). See “Accessory covers and the tray 2 extension door” on page 143. 2. Insert the tip of a a small flat-blade screwdriver under the tray 1 separation pad. 3. Carefully twist the screwdriver to dislodge the separation pad. Remove the tray 1 separation pad. Figure 64.
Tray 2 feed rollers 1. Remove tray 2 and place it on a level work surface. Locate and open the cover (arrow) that is next to the roller in tray 2. Figure 65. Tray 2 feed rollers (1 of 4) 2. Pinch the blue latch that is on the left side of the roller. Slide the roller off of the shaft (arrows). 1 Figure 66. CAUTION Q2431-90912 Tray 2 feed rollers (2 of 4) When you install the roller, make sure that it locks into place.
WARNING! Do not allow the front of the printer to extend beyond the edge of the work surface. The printer can become unbalanced and fall, which can cause damage to the printer or personal injury to the service technician. 3. Move the front of the printer to the edge of the work surface for better access to the feed roller. To find the rollers, look up into the inside of the opening that was created when you removed tray 2. Figure 67. Tray 2 feed rollers (3 of 4) 4.
Covers, tray 1, and the rear output bin Accessory covers and the tray 2 extension door Note Accessory covers will not be in place if any installed accessories (for example, the optional stapler/stacker) have been removed to service the printer. 1. Grasp the top accessory cover (the mounting position for the optional stapler/stacker or stacker). Rotate the cover toward the front of the printer to release it, and then lift it up to remove it. Figure 69. Accessory covers (1 of 4) 2. Open tray 1.
3. Grasp the rear accessory cover (the mounting position for the optional duplexer) and pull it straight out of the printer. Figure 71. Accessory covers (3 of 4) 4. Rotate the tray 2 extension door to the horizontal position. Lift up on the right side of the door to unlock its pivot bar. Slide the left-side pivot pin out of its retainer and remove the door. Figure 72.
Formatter cover 1. Grasp the formatter cover. 2. Pull the cover straight back and away from the printer. Figure 73.
Top cover Note If the optional stapler/stacker or stacker accessory is installed, lift it straight up and off of the printer to remove it. Then proceed to step 2. 1. Remove the top accessory cover. See “Accessory covers and the tray 2 extension door” on page 143. 2. Remove the two rear mounting screws (callout 1). 1 2 Figure 74. Top cover (1 of 5) 3. Open the print-cartridge door. Remove the front two mounting screws (callout 2). 2 Figure 75.
4. Use needle-nose pliers to release the print-cartridge drive-arm (callout 3). Hint Push the drive-arm back into the printer to avoid damaging it when you remove the top cover. 3 Figure 76. Top cover (3 of 5) 5. Open tray 1 and the rear door. Grasp the top cover and carefully rotate the left edge up and away from the printer. Do not apply stress to the control-panel wire-harness (callout 4) when rotating the top cover away from the printer. 4 Figure 77.
6. Disconnect the control-panel wire-harness (callout 5) from the DC controller PCA. Remove the top cover. 5 3 Figure 78. Top cover (5 of 5) CAUTION When the top cover is re-installed, make sure that the wire-harnesses are properly routed through the cable guides. If the wire-harnesses are not properly routed, they can be damaged when the top cover is installed. Hint The control-panel wire-harness connector can easily be disconnected when you install the top cover.
Right-side cover 1. Remove the following assemblies: ● Formatter cover. See “Formatter cover” on page 145. ● Top cover. See “Top cover” on page 146. 2. Release the upper right-side cover-locking tab near the formatter (callout 1). 1 Figure 79. Right-side cover (1 of 4) 3. Locate the arrow that is embossed on the tray-number indicator. Use a small flat-blade screwdriver to push in on the lower cover-locking tab to release it. Figure 80.
4. Locate the arrow (callout 2) that is embossed on the pickup gear cover near the optional envelope feeder power connector (not shown; open tray 1 to locate this arrow). Use a small flat-blade screwdriver to push in on the locking tab to release it 2 Figure 81. Right-side cover (3 of 4) 5. Open the formatter door and rotate the right-side cover away from the printer and lift it up to remove it. 3 2 Figure 82.
Left-side cover 1. Remove the top cover. See “Top cover” on page 146. 2. Release the upper (callout 1) and front left-side cover-locking tabs. 1 Figure 83. Left-side cover (1 of 2) 3. Rotate the top of the cover away from the printer and lift the cover up to remove it. Figure 84.
Tray 1 1. Open tray 1. Use your fingers to gently pry the paper-guide slide-pin hinges out of the hinge slots on the tray 1 door to release the pins. Figure 85. Tray 1 (1 of 6) 2. Slide the tray 1 door to the right and remove it. 1 1 2 Figure 86. Reinstall note Tray 1 (2 of 6) When you install the tray 1 door, the door-stop pin (callout 1) must be installed in the stop receptacle on the door (callout 2) so that the door will open and close properly.
3. Firmly pull both sides of the tray 1 sensor arm cover down to release it from the shaft. Figure 87. Tray 1 (3 of 6) Reinstall note When the tray 1 sensor cover is installed, verify that the sensor arms move freely. Note Be sure to look at how the spring (callout 3) is positioned before removing it. 4. Rotate tray 1 upward and release the return spring (callout 3) from the bottom of tray 1. 3 Figure 88.
5. Rotate the paper guide down and away from the printer to release the left paper-guide hinge. Figure 89. Tray 1 (5 of 6) 6. Slide the paper guide to the left to remove it. Figure 90. Tray 1 (6 of 6) Hint Tape the return spring in place on tray 1 so that you will not lose it. Reinstall note When installing the tray 1 paper guide, hook the short end of the return spring in the small notch located below the right-side hinge-pin receptacle.
Rear output bin Note If the optional duplexer accessory is installed, lift it up slightly and pull it away from the printer to remove it. 1. Open the rear output bin. Use your finger to squeeze the hinge pin (formatter side) out of its mounting hole. Figure 91. Rear output bin (1 of 2) 2. Rotate the output bin away from the printer until the right hinge pin is released, and then remove the output bin. Figure 92.
Control-panel display Control-panel overlay 1. Use a small flat-blade screwdriver to carefully pry the top of the control-panel overlay (circled; callout 1) away from the printer. 2. Remove the overlay. 1 Figure 93.
Control-panel assembly CAUTION Always remove the top cover before attempting to remove the control panel. If you drop any of the control-panel mounting screws into the printer when you remove the control panel, they might be difficult to recover. Severe damage to the printer can result if the power is turned on when loose screws are inside the unit. 1. Remove the top cover. See “Top cover” on page 146. 2. Place the top cover upside-down on a padded work surface. 3. Remove six screws (callout 1).
4. Raise the top cover so that the print cartridge door begins to open. This allows the door-open flag (callout 2) on the print cartridge door to clear the opening (callout 3) in the top cover. Remove the control panel PCA cover. 3 2 Figure 95. Control-panel assembly (2 of 4) 5. Remove the grounding-strip screw and clip (callout 4). Reinstall note When you install the grounding strip (callout 5), do not forget to replace the protective clip.
CAUTION The product contains components that are sensitive to electrostatic discharge (ESD). Always perform service work at an ESD-protected workstation. 6. Use your fingers to gently pry the front of the print-cartridge door away from the controlpanel display to release the retainer clip (callout 6). Unplug the control-panel wire-harness (callout 7). Remove the control panel. 6 7 5 6 Figure 97.
Internal components Firmware DIMM CAUTION The product contains components that are sensitive to electrostatic discharge (ESD). Always perform service work at an ESD-protected workstation. If an ESD-protected workstation is not available, discharge body static by grasping the printer chassis before touching an ESD-sensitive component. Ground the printer chassis before servicing the product 1. Remove the formatter cover. See “Formatter cover” on page 145.
Formatter assembly Hint If possible, print a menu map and a configuration page. See“Menu map” on page 240 and “Configuration page” on page 241. Use the information on the these pages to restore any user-set product configuration options after you install a replacement formatter. 1. Remove the formatter cover. See “Formatter cover” on page 145. 2. Remove two screws (callout 1). 3. Slide the formatter assembly toward the rear of the printer to release it. Remove the formatter assembly. 1 Figure 99.
Fuser WARNING! The fuser is very hot. After turning the printer power off, allow the fuser to cool for at least 30 minutes before removing it. 1. Remove the rear output bin. See “Rear output bin” on page 155. 2. Squeeze the blue fuser release tabs (callout 1). 1 Figure 100. Fuser (1 of 2) 3. Pull the fuser straight back and out of the printer. CAUTION Figure 101. Hint Do not drop or jar the fuser. It can easily be damaged if it is mishandled.
Output delivery assembly 1. Remove the following assemblies: ● Top cover. See “Top cover” on page 146. ● Rear output bin. See “Rear output bin” on page 155. 2. Release the locking pin on the shaft lock and rotate the lock toward the rear of the printer until the inner retaining tab (gear side) aligns with the hole in the output delivery assembly frame. Slide the shaft lock to the right and remove it to release the gear shaft from the output delivery assembly. Hint Figure 102.
CAUTION The rear face-down output-bin-sensor (callout 1) wire is routed through a notch (callout 2) on the output delivery system at the gear end of the assembly. When you remove the assembly, make sure that this wire-harness is carefully removed from the notch and is not damaged. 3. Lift up the gear end of the assembly slightly and move the assembly toward the formatter assembly to remove it. 2 1 Figure 103.
Duplexing pendulum assembly Note The duplexing pendulum assembly is part of the paper-path switching mechanism when the optional duplexer accessory is installed. It also drives the output delivery assembly. 1. Remove the following assemblies: ● Top cover. See “Top cover” on page 146. ● Rear output bin. See “Rear output bin” on page 155. ● Formatter assembly. See “Formatter assembly” on page 161. ● Output delivery assembly. See “Output delivery assembly” on page 163. 2.
CAUTION The gears in this assembly are not captive when the assembly is removed. They can easily slide off of the shafts. Handle the assembly carefully and place it gear-side up on your workstation to prevent the gears from coming off of the shafts. 3. Pull the duplexing pendulum assembly toward the laser/scanner until the upper gear-drive shaft clears the hole in the chassis, and then remove the assembly. Figure 105.
Tray 2 media-size sensor 1. Remove the following assemblies: ● Top and right-side covers. See“Top cover” on page 146 and “Right-side cover” on page 149. ● Formatter assembly. See “Formatter assembly” on page 161. 2. Unplug the sensor connector (callout 1). Remove two screws (callout 2). 2 1 Figure 106. Tray 2 media-size sensor (1 of 2) 3. Depress the locking tab (callout 3), and slide the sensor toward the front of the printer to release it. Remove the sensor. 3 Figure 107.
Main cooling fan (left side) 1. Remove the following assemblies: ● Top cover. See “Top cover” on page 146. ● Left-side cover. See “Left-side cover” on page 151. 2. Remove two screws (callout 1). Remove the power-supply shield (callout 2). 2 1 Figure 108. Main cooling fan (1 of 4) 3. Unplug the fan connector (callout 3) and thermistor sensor connector (callout 4) from the power supply. 4 3 Figure 109.
4. Remove one screw (callout 5). Slide the thermistor sensor bar (callout 6) to the right to release it. Remove the thermistor sensor bar. 6 5 7 6 Figure 110. Main cooling fan (3 of 4) 5. Release the two fan-locking tabs (callout 7). Slide the fan out of its mounting bracket. 7 8 Figure 111. Main cooling fan (4 of 4) Reinstall note When you install the fan, the air must flow into the printer. Verify that the airflow arrows that are embossed on the fan body point into the printer.
Cooling fan (right side; HP LaserJet 4300 series printer only) Note This fan is not installed in the HP LaserJet 4200 series printer. 1. Remove the following assemblies: ● Top cover. See “Top cover” on page 146. ● Right-side cover. See “Right-side cover” on page 149. 2. Gently pry back the two retaining tabs (callout 1) and slip the anti-static bar (callout 2) bar off of them. 8 2 Figure 112. 8 1 Cooling fan (HP LaserJet 4300 series only; 1 of 5) 3.
4. Unplug the fan connector from the DC controller PCA (location J78; callout 3) and unweave it from the harness guide (callout 4). Hint It might be necessary to unplug various connectors or release some wire-harness retainer clips to provide enough slack in the wire-harnesses to unweave them easily from the harness guide. 3 4 Figure 114. Cooling fan (HP LaserJet 4300 series only; 3 of 5) 5. Use a screwdriver to push against the fan through the fan duct, from inside the printer.
6. If it is necessary to remove the fan duct (for example, if the main drive assembly is going to be removed), unweave the remaining wire-harness (callout 6) from the harness guide (callout 7). Remove two screws (callout 8) and remove the fan-duct bracket. Hint It might be necessary to unplug various connectors or release some wire-harness retainer clips to provide enough slack in the wire-harnesses to unweave them easily from the harness guide. 8 6 7 Figure 116.
Laser/scanner assembly 1. Remove the following assemblies: ● Top cover. See “Top cover” on page 146. ● Right-side cover. See “Right-side cover” on page 149. 2. Unplug the laser/scanner wire-harness connector from the DC controller PCA (location J84; callout 1). Remove the laser/scanner wire-harness from the wire guide (callout 2). 2 1 Figure 117. Laser/scanner (1 of 4) 3. Unplug the laser/scanner wire-harness (callout 3) from the laser/scanner PCA 3 4 Figure 118.
4. Remove four screws (callout 4). Do not turn the laser/scanner adjustment screw (circled). 4 3 Figure 119. Reinstall note Laser/scanner (3 of 4) The two front mounting screws have grounding clips that are not captive when the screws are removed. Be sure to replace these clips when the laser/scanner is installed. 5. Carefully lift the laser/scanner up and out of the printer. Make sure the wires along the bottom of the laser/scanner assembly don’t get snagged by the assembly when the assembly is removed.
Print-cartridge motor (HP LaserJet 4300 series printer only) Note This motor is not installed on the HP LaserJet 4200 series printer. 1. Remove the following assemblies: ● Top cover. See “Top cover” on page 146. ● Right-side cover. See “Right-side cover” on page 149. 2. Unplug the print-cartridge motor wire-harness connector from the DC controller PCA (location J86; callout 1). Unweave the harness from the wire guide (callout 2).
3. Slip the toroid (callout 3) off of its retainer clip. Support the motor and remove three screws (callout 4). Remove the print-cartridge motor. 3 4 Figure 122.
Main motor 1. Remove the following assemblies: ● Top cover. See “Top cover” on page 146. ● Right-side cover. See “Right-side cover” on page 149. 2. Unplug the power-supply ribbon cables and the main motor harness connector from the DC controller PCA (locations J80, J81, and J98; callout 1). Unweave all of the wire-harnesses from the wire guide (callout 2). 1 2 Figure 123. Main motor (1 of 3) 3. Push in on the wire guide locking tabs (callout 3) to release the guide and push down to remove it.
4. Remove three screws (callout 4). Remove the main motor. 4 3 Figure 125.
Tray 2 lifter-drive assembly 1. Remove the following assemblies: ● Top cover. See “Top cover” on page 146. ● Right-side cover. See “Right-side cover” on page 149. 2. Use a small flat-blade screwdriver to pry up the lifter-drive assembly connector (callout 1) retaining tab and unplug the connector from the DC controller PCA (location J93). Unweave the harness from the wire guides (callout 2).
3. Unhook the tension spring (callout 3). Remove one screw (callout 4). Remove the lifter-drive assembly. Hint It might be necessary to remove some wire guides to easily remove the lifter-driver assembly. 3 4 Figure 127.
DC controller PCA 1. Remove the following assemblies: ● Top and right-side covers. See “Top cover” on page 146 and “Right-side cover” on page 149. ● Formatter assembly. See “Formatter assembly” on page 161. CAUTION The product contains components that are sensitive to electrostatic discharge (ESD). Always perform service work at an ESD-protected workstation.
3. Remove the two screws (callout 4) that fasten the formatter connector bracket to the chassis. Unweave the formatter connector wire-harness from the wire guides (callout 5). Hint It might be necessary to remove additional wire-harnesses from the wire guide to gain access to the formatter connector harness. 4 5 Figure 129. DC controller PCA (2 of 3) 4. Push in on the locking tab (callout 6) on the rear of the DC controller PCA wire guide (callout 6), and then push up on the guide to release it.
Paper-pickup assembly, 1. Remove the following assemblies: ● Top cover. See “Top cover” on page 146. ● Right-side cover. See “Right-side cover” on page 149. 2. Remove one e-clip (callout 1) and the shaft collar (callout 2). Lift the power-switch connector-bar (callout 3) up and swing it away from the paper-pickup gear assembly. 3 1 2 Figure 131. Paper-pickup assembly (1 of 5) 3. From the right side of the printer, push the tray drive-gear/shaft into the tray 2 cavity and remove it.
4. Unplug the paper-pickup gear assembly solenoid (callout 4) connector from the DC controller PCA (location J92; callout 5). Unweave the solenoid wire-harness from the wire guide and the cable clips (callout 6). Hint It might be necessary to remove additional wire-harnesses from the wire guide to gain access to the solenoid wire-harness. 4 5 5 6 4 Figure 133. Paper-pickup assembly (3 of 5) 5. Remove four screws (callout 7).
6. Remove the paper-pickup gear assembly. Figure 135. Reinstall note Paper-pickup assembly (5 of 5) When you install the tray 2 drive gears and shaft, verify that the gears are seated on the shaft locking bars and that the shaft collars are correctly positioned in the paper-pickup gear assembly mounting bracket and printer chassis. When you install the paper-pickup assembly, reach up inside the printer and push the rear feeder roller (see figure 68 on page 142) up into its raised position.
Main drive assembly 1. Remove the following assemblies: ● Top and right-side covers. See “Top cover” on page 146 and “Right-side cover” on page 149. ● Right-side fan (HP LaserJet 4300 series only) and fan duct. See “Cooling fan (right side; HP LaserJet 4300 series printer only)” on page 170. ● Print-cartridge motor (HP LaserJet 4300 series only). See “Print-cartridge motor (HP LaserJet 4300 series printer only)” on page 175. ● DC controller PCA. See “DC controller PCA” on page 181. 2.
3. Remove five screws (callout 3). Remove the main drive assembly. 3 Figure 138.
Power supply 1. Remove the following assemblies: ● Rear output bin. See “Rear output bin” on page 155. ● Rear accessory cover and tray 2 extension door. See “Accessory covers and the tray 2 extension door” on page 143. ● Top, right-side, and left-side covers. See “Top cover” on page 146 through“Left-side cover” on page 151. ● Fuser. See “Fuser” on page 162. ● Formatter assembly. See “Formatter assembly” on page 161. 2.
3. Remove two screws (callout 4). Depress the tray 2 right-side guide lock (callout 5) and slide the guide (callout 6) toward the back of the chassis to release it. Remove the guide. Rotate the power-switch connector bar (callout 7) away from the printer. 7 4 6 5 Figure 140. Power supply (2 of 5) 4. Remove five screws (callout 8). Unplug the left-side fan and thermistor sensor connectors on the power-supply PCA (callout 9; behind the cover plate). 8 9 7 8 7 8 Figure 141.
5. Feed the two ribbon cables and the wire-harness through the hole in the right side of the chassis (callout 9) under the power supply. Pull down on the power-switch connector bar (callout 10) to slide it out of its mounting bracket, and remove it. 9 8 Figure 142. CAUTION 10 9 Power supply (tray 2 cavity; 4 of 5) When performing the next step, verify that the four rubber belts and plastic rollers (callout 3 in figure 145 on page 191) remain in place.
Paper-feed belt assembly 1. Remove the power supply. See “Power supply” on page 188. 2. Remove three screws (callout 1). 1 Figure 144. CAUTION Paper-feed belt assembly (1 of 2) Verify that the four rubber belts and plastic rollers (callout 3) remain in place. These belts and rollers can easily come off and be lost. When you install the paper-feed belt assembly, verify that the center foot (on the power-supply side; callout 4) is correctly hooked under the support leg on the power supply. 3.
Tray 1 paper-pickup assembly 1. Remove the following assemblies: ● Top, right-side, and left-side covers. See “Top cover” on page 146 through “Left-side cover” on page 151. ● Tray 1. See “Tray 1” on page 152. 2. Unplug the tray 1 pickup solenoid connector and the top-cover sensor from the DC controller PCA (locations J79 and J95; callout 1). Unweave the harnesses from the wire guide (callout 2).
3. Remove three screws (callout 3). Depress the pickup-gear-cover upper retainer tab (callout 4) to release it. Lift up on the cover to release the lower retaining tab (not shown) and remove the cover. 4 3 Figure 147. Tray 1 pickup assembly (2 of 4) 4. Unplug the pickup sensor connector (callout 5). Remove six screws (callout 6). Reinstall note One of the screws (callout 7) on the left side is longer that the others. Make sure that this screw is replaced in the same hole it is removed from.
CAUTION Carefully thread the solenoid wire-harness through the hole provided in the chassis. When you remove the pickup assembly, avoid pinching the pickup solenoid wire-harness between the assembly and the chassis. 5. Rotate the left side of the assembly away from the chassis and then slide the assembly to the left to remove it. Carefully feed the pickup assembly solenoid wire-harness through the opening in the chassis as you remove the assembly. Figure 149. Reinstall note Figure 150.
Paper feed assembly 1. Remove the following assemblies: ● Tray 1. See “Tray 1” on page 152. ● Tray 1 pickup assembly. See “Tray 1 paper-pickup assembly” on page 192. 2. Unplug the paper-feed assembly wire-harness connector from the DC controller PCA (location J89; callout 1). Unweave the wire-harness from the wire guide (callout 2). Hint It might be necessary to remove additional wire-harnesses from the wire guides to gain access to the paper-feed assembly wire-harness. 1 2 Figure 151.
3. Feed the paper-feed assembly wire-harness through the hole in the chassis (callout 2). Remove three screws (callout 3). 3 2 Figure 152.
Reinstall note When the paper feed assembly is installed, the sensor-flag spring must be correctly positioned for the flag to operate. If a paper-jam error message (13.20.00 JAM) appears on the control-panel display after you replace the paper feed assembly, verify that this sensor-flag spring is installed correctly. Hook the spring over the flag tab (see 1 in Figure 153). Fasten the paper feed assembly to the chassis with the flag spring positioned in the hole in the transfer assembly.
Registration assembly 1. Remove the main drive assembly. See “Main drive assembly” on page 186. 2. Remove one e-clip retainer (callout 1) and one screw (callout 1). Remove the registration roller drive gear (callout 2). 1 2 Figure 154. Registration assembly (1 of 3) 3. Remove three screws (callout 3). 3 Figure 155.
CAUTION Do not remove the screw (callout 4) that holds the registration-roller plate return spring in place. It is not necessary to remove this spring. 4. Use the green handle (located at the right edge of the registration plate) to raise the registration-roller plate. Remove three screws (two large self-tapping screws on the right-hand side and one silver machine screw; callout 5). Remove the registration assembly. 5 4 Figure 156.
Transfer assembly 1. Remove the following assemblies: ● Output delivery assembly. See “Output delivery assembly” on page 163. ● Paper-pickup and main drive assemblies. See “Paper-pickup assembly,” on page 183 through “Main drive assembly” on page 186. ● Power supply. See “Power supply” on page 188. ● Tray 1 pickup assembly. See “Tray 1 paper-pickup assembly” on page 192. 2. Remove four screws (callout 1; right side). Remove the one e-ring retainer clip and gear (callout 2). 2 1 Figure 157.
3. Remove the tray 2 left-side guide mounting screw (callout 3). Depress the tray 2 left-side guide locking tab (callout 4). Slide the guide out of the chassis to remove it. 3 4 Figure 158.
4. Push the paper-feed and transfer assembly wire-harnesses through the hole in the chassis (callout 5). Reinstall note The plastic clip (callout 5) that lines the hole in the chassis protects the wire-harnesses from chaffing on an exposed edge of the sheet-metal chassis. This clip can easily become dislodged and lost. Make sure that this clip is installed when you replace the transfer assembly. 5 6 Figure 159. Transfer assembly (3 of 5) 5.
6. Support the transfer assembly and carefully separate the left side of the chassis from the laser/scanner shelf and the chassis bottom panel. Slide the transfer assembly away from the right side of the chassis and remove it. Figure 161. Reinstall note Transfer assembly (5 of 5) Feed the tray 1 pickup assembly wire-harness through the hole in the left side of the chassis, before installing the left side chassis. The left-side chassis must be correctly aligned when it is installed.
Accessories 500-sheet feeder assembly 500-sheet feed rollers Note The removal procedure for the two paper-feed rollers located up inside of the 500-sheet feeder is the same as the procedure for the tray 2 feed rollers. See “Tray 2 feed rollers” on page 141. 500-sheet feeder right-side cover 1. Remove two screws (callout 1) and the front cover (callout 2). 1 2 Figure 163.
2. Use a flat-blade screwdriver to release the right-side cover front locking tab. Figure 164. 500-sheet feeder right-side cover (2 of 5) 3. Depress the edge of the cover and release the three center locking tabs. Figure 165.
4. Use flat-blade screwdriver to release the rear locking tab. Figure 166. 500-sheet feeder right-side cover (4 of 5) 5. Rotate the top of the cover away from the tray assembly and lift it up to remove it. Figure 167.
500-sheet feeder control PCA CAUTION The product contains components that are sensitive to electrostatic discharge (ESD). Always perform service work at an ESD-protected workstation. If an ESD-protected workstation is not available, discharge body static by grasping the 500-sheet feeder chassis before touching an ESD-sensitive component. Ground the 500-sheet feeder chassis before servicing the product. 1. Remove the 500-sheet feeder right-side cover. See “500-sheet feeder right-side cover” on page 204. 2.
500-sheet feeder media-size sensor 1. Remove the 500-sheet feeder PCA. See “500-sheet feeder control PCA” on page 207. 2. Remove two screws (callout 1). 1 1 2 Figure 169. 500-sheet feeder media-size sensor (1 of 2) 3. Push the locking tab (figure 169; callout 2) and slide the sensor toward the front of the feeder to release it. Remove the sensor. Figure 170.
500-sheet feeder lifter-drive assembly 1. Remove the 500-sheet feeder right-side cover. See “500-sheet feeder right-side cover” on page 204. 2. Unplug the lifter-drive harness connector from the assembly PCA (location J803; callout 1). Disconnect the tension spring (callout 2) and remove one screw (callout 3). 1 2 3 Figure 171. 500-sheet feeder lifter-drive assembly (1 of 2) 3. Pull the tray lifter-drive assembly out towards the right side of the chassis until its pivot shaft clears the tray guide.
500-sheet feeder paper-pickup drive assembly 1. Remove the following assemblies: ● 500-sheet feeder right-side cover. See “500-sheet feeder right-side cover” on page 204. ● 500-sheet feeder tray lifter-drive assembly. See “500-sheet feeder lifter-drive assembly” on page 209. 2. Unplug the main drive solenoid harness connector (callout 1) from the CA (location J802). Remove the harness from the harness clip (callout 2). 1 2 Figure 173. 500-sheet feeder paper-pickup drive assembly (1 of 7) 3.
4. Unplug the accessory-connector wire-harness from the PCA (callout 4). 4 Figure 175. 500-sheet feeder paper-pickup drive assembly (3 of 7) 5. Remove 8 screws (callouts 5, 6, and 7). Remove the chassis gutter (callout 8). Callout 5 consists of 1 screw on the end and 1 screw at the top of the angular brace 5 Callout 6 consists of 1 screws on the end and 1 screw at the top of the angular brace 5 6 5 7 6 8 Figure 176.
6. Remove one e-clip and the shaft collar (callout 9). 9 7 Figure 177. 500-sheet feeder paper-pickup drive assembly (5 of 7) 7. Push the shaft into the paper-pickup drive assembly. Grasp the tray drive gear inside the tray cavity and pull the gear/shaft assembly out of the paper-pickup gear assembly. Figure 178.
CAUTION Some gears are not captive when the paper-pickup assembly is removed. They can easily slide off of the shafts and be lost. Also, the solenoid is not captive when the paper-pickup assembly is removed. 8. Remove five screws (callout 10). Pull the paper-pickup gear assembly away from the chassis and remove it. 10 7 Figure 179.
1,500-sheet feeder assembly 1,500-sheet feeder feed rollers Note The removal procedure for the two paper-feed rollers that are located up inside of the 1,500-sheet feeder is the same as the procedure for the tray 2 feed rollers. See “Tray 2 feed rollers” on page 141. 1,500-sheet feeder separation roller 1. Open the 1,500-sheet feeder door. Open the feed roller cover. Figure 181. 1,500-sheet feeder roller (1 of 2) 2.
1,500-sheet feeder door 1. Remove one screw (callout 1) and remove the door-stop plate (callout 2). 2 Figure 183. 1 1,500-sheet feeder door (1 of 3) 2. Open the 1,500-sheet feeder door about halfway. Gently pry open the door slide-bar slot and disengage the door slide-bar from the feeder. Figure 184.
3. Lift the door straight up and off of the door hinge pins. 2 Figure 185. Hint 1,500-sheet feeder door (3 of 3) The door hinge pins are not captive when the door is removed. If the feeder must be turned on its side or placed upside down, remove the hinge pins and the door spring (callout 2). Place the pins and the spring where you will not lose them.
1,500-sheet feeder rear cover 1. Locate the upper rear-cover locking tabs (callout 1) on each side of the rear cover (they are marked with arrows; callout 2). Use a flat-blade screwdriver to release these tabs. 1 2 Figure 186. 1,500-sheet feeder rear cover (1 of 2) 2. Rotate the top of the cover away from the feeder. Lift up on the cover to release it. Figure 187.
1,500-sheet feeder right-side cover 1. Remove the following assemblies: ● Door. See “1,500-sheet feeder door” on page 215. ● Rear cover. See “1,500-sheet feeder rear cover” on page 217. 2. Remove one screw (callout 1). 1 Figure 188. 1,500-sheet feeder right-side cover (1 of 3) 3. Use a flat-blade screwdriver to release the cover-locking tab (door hinge side; callout 2) 2 Figure 189.
4. Rotate the top of the cover away from the chassis and then lift it up and remove it. Figure 190.
1,500-sheet feeder control PCA 1. Remove the following assemblies ● Door. See “1,500-sheet feeder door” on page 215. ● Rear and right-side covers. See “1,500-sheet feeder rear cover” on page 217 and “1,500-sheet feeder right-side cover” on page 218. 2. Unplug six wire-harness connectors (callout 1). 1 Figure 191. 1,500-sheet feeder control PCA (1 of 2) 3. Remove two screws (callout 2). Use a pair of needle-nose pliers to squeeze the top of one of the nylon PCA tabs (callout 3).
1,500-sheet feeder media-size sensor 1. Remove the following assemblies: ● Door. See “1,500-sheet feeder door” on page 215. ● Rear and right-side covers. See “1,500-sheet feeder rear cover” on page 217 and “1,500-sheet feeder right-side cover” on page 218. 2. Unplug the sensor wire-harness at the sensor (callout 1). 3. Remove one screw (callout 2). 4. Remove the sensor. CAUTION There are two plastic locator pins on the back of the sensor. Be careful not to break them when the sensor is removed.
1,500-sheet feeder lifter-drive assembly 1. Remove the following assemblies: ● Door. See “1,500-sheet feeder door” on page 215. ● Rear and right-side covers. See “1,500-sheet feeder rear cover” on page 217 and “1,500-sheet feeder right-side cover” on page 218. 2. Unplug the lifter-drive harness connector from the PCA (location J1003; callout 1). 3. Unplug the lifter-drive sensor harness from the sensor (callout 2) and remove the sensor harness from the wire clip (callout 3). 2 3 1 2 Figure 194.
4. Remove seven screws (callout 4) and then remove the bracket (callout 5). 5. Slide the spring-gear assembly (callout 6) away from the chassis until the gear shaft clears the hole in the chassis. Slide the assembly towards the rear of the feeder and then remove it. 6 4 5 Figure 195. 1,500-sheet feeder lifter-drive assembly (2 of 4) 6. Release the lifter-gear shaft-collar locking pin and rotate the collar until the inner locking tabs align with the corresponding holes in the bracket.
7. Slide the lifter-drive assembly away from the chassis until the lifter-drive gear-shaft clears the corresponding hole in the bracket. Remove the assembly. Figure 197.
1,500-sheet feeder paper-pickup drive assembly 1. Remove the following assemblies: ● Door. See “1,500-sheet feeder door” on page 215. ● Rear and right-side covers. See “1,500-sheet feeder rear cover” on page 217 and “1,500-sheet feeder right-side cover” on page 218. 2. Unplug the paper-pickup drive-solenoid harness connector from the assembly PCA (location J1005; callout 1). Remove four screws (callout 2). 3.
226 Removing and replacing parts Q2431-90912
7 Troubleshooting Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230 Troubleshooting process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231 Initial troubleshooting checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232 Troubleshooting flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234 Power-on checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display-message troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Status messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Warning messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Error messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Critical-error messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Alphabetical printer messages . . . . . . . . . .
Accessory component locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339 500-sheet feeder main parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339 500-sheet feeder switches, sensors, solenoids, and PCAs. . . . . . . . 340 1,500-sheet feeder main parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341 1,500-sheet feeder switches, sensors, solenoids, and PCAs . . . . . . 343 Stapler/stacker stapler assembly. . . . . . . . . . . . . . . . . . . . . . . .
Introduction In order to use the information in this chapter, you should have a basic understanding of the LaserJet printing process. Explanations of each mechanical assembly, the printer systems, and the basic theory of operation are contained in chapter 5 of this manual. Do not perform any of these troubleshooting processes unless you understand the function of each printer component.
Troubleshooting process When the printer malfunctions or encounters an unexpected situation, information on the printer control panel alerts you to the situation. This section contains an initial troubleshooting checklist that helps to eliminate many possible causes of the problem. The subsequent troubleshooting flowchart helps you to diagnose the cause of the problem. The remainder of the chapter provides steps for correcting the problems that have been identified.
Initial troubleshooting checklist The following checklist contains basic questions that you can ask the customer to help define the problem(s) quickly. For more information about printer and media specifications, see “Site requirements” on page 5 and “Paper specifications” on page 9. Table 37. Initial troubleshooting checklist Is the printer installed in a suitable environment? See “Site requirements” on page 5.
Table 37. Initial troubleshooting checklist (continued) Miscellaneous Q2431-90912 Are any non-HP components installed? Check for any non-HP components (print cartridges, memory modules, and EIO cards) installed in the printer and remove them. Hewlett-Packard recommends the use of HP components in its printers. ● Remove the printer from the network, and make sure that the failure is associated with the printer before beginning troubleshooting.
Troubleshooting flowchart The flowchart on these two pages highlights the general processes you can use to isolate and solve printer hardware problems quickly. Each heading depicts a major troubleshooting step. A "yes" answer to a question allows you to proceed to the next major step. A "no" answer indicates that additional testing is needed. Proceed to the appropriate section in this chapter, and follow the instructions there.
Troubleshooting flowchart (continued) Information pages Can you print a configuration page? YES Image quality Does the print quality meet customer requirements? NO YES Interface Can the customer print successfully from the host computer? NO NO Configuration page Print an event log. If error messages appear on the control-panel display when you try to see or print the configuration page, see “Alphabetical printer messages” on page 258 and “Numerical printer messages” on page 274.
Power-on checks The basic printer functions should start up as soon as the printer is plugged into an electrical wall receptacle and the power switch is pushed to the on position. Overview Turn on the printer power. If the control-panel display remains blank, random patterns appear, or asterisks remain on the display, perform power-on checks to locate the cause of the problem. During normal printer operation, the main cooling fan begins to spin briefly after the printer power is turned on.
Table 38. Power-on defect or blank display Problem Action The power cord is not plugged into the wall receptacle and connected to the printer. Make sure that the power cord is firmly plugged into the wall receptacle and connected to the printer. Proper power is not available. Measure the voltage at the outlet. If necessary, plug the power cord into another circuit outlet. The power switch is off. Set the switch to the on position. You should hear the switch toggle.
Table 38. Power-on defect or blank display (continued) Problem Action The fan works, but the control-panel display is blank. 1. Print an engine test. “Engine test page” on page 254 2. If the engine test is successful, perform the following steps in order. ● Reseat the control panel and formatter connector. See “Control-panel assembly” on page 157 and “Formatter assembly” on page 161. ● Replace the control panel cable. See “Control-panel assembly” on page 157. ● Replace the control panel assembly.
Troubleshooting tools Press the SELECT ( ) button to open the menus. Use the UP ARROW ( ) button or the DOWN ARROW ( ) button to scroll through the menus that appear. For more information about control panel menus, see “Control-panel menus” on page 39. The high-level menus appear in the following order: ● RETRIEVE JOB ● INFORMATION ● PAPER HANDLING ● CONFIGURE DEVICE ● DIAGNOSTICS ● SERVICE Information pages 1. Press the SELECT ( ) button to open the MENUS. 2. Press the DOWN ARROW 3.
Menu map Use the menu map to help navigate the printer submenus and select configuration settings. Printing a menu map is very helpful when you are changing numerous printer settings. 1. Press the SELECT ( Figure 201. ) button to open the menus. 2. Use the UP ARROW ( ) button or the DOWN ARROW ( and then press the SELECT ( ) button. ) button to scroll to INFORMATION, 3. Use the UP ARROW ( ) button or the DOWN ARROW ( then press the SELECT ( ) button.
Configuration page Use the configuration page to view current printer settings, to help troubleshoot printer problems, or to verify installation of optional accessories, such as memory (DIMMs), trays, and printer languages. The content of the configuration page varies, depending on the options currently installed in the printer. To decode the service identification information on the configuration page, see “Converting the Service ID to an actual date” on page 250.
Supplies status page Use the supplies status page to obtain information about the print cartridge installed in the printer, the amount of life left in the print cartridge, and the number of pages and jobs that have been processed. The page also lets you know when you should perform the next preventative maintenance. 1. Press the SELECT ( ) button to open the menus. 2. Use the UP ARROW ( ) button or the DOWN ARROW ( and then press the SELECT ( ) button. ) button to scroll to INFORMATION, 3.
Embedded Web server When the printer is directly connected to a computer, the embedded Web server is supported for Windows 95 and later. In order to use the embedded Web server with a direct connection, you must choose the Custom installation option when you install the printer driver. Select the option to load Printer Status and Alerts. The proxy server is installed as part of the Printer Status and Alerts software.
Information tab The Information tab contains the following pages. ● Device Status. Shows the printer status and the life that remains in HP supplies (0 percent represents that a supply is empty). This page also shows the type and size of print media set for each tray. To change the default settings, click Change Settings. ● Configuration page. Shows the information that is contained on the printer Configuration page. ● Supplies Status.
Other links This section of the embedded Web server contains links that connect you to the Internet. You must have Internet access in order to use any of these links. If you use a dial-up connection and did not connect when you first opened the embedded Web server, you must connect before you can visit these Web sites. Connecting to the Internet might require that you close your Web browser and reopen it. ● HP Instant Support™ connects to the HP website to help you find solutions.
To select status messages 1. Open Printer Status and Alerts in one of these ways: • Double-click the Printer Status and Alerts tray icon, which is near the clock in the Tray Manager. • On the Start menu, point to Programs, point to Printer Status and Alerts, and click Printer Status and Alerts. 2. Click the Options icon on the left side of the window. 3. In the For field, select the printer driver for this printer, or select All Printers. 4.
Control-panel menus Use the control-panel menus to control various printer functions. For example, you can use the Resets submenu to quickly reset and restore most of the factory default printer settings. Not all of the available menus are described in this manual. For more information about control-panel menus, see “Control-panel menus” on page 39. Using control-panel menus 1. Press the SELECT ( ) button to open the menus. 2.
Diagnostics menu Administrators can use this menu to isolate parts and to troubleshoot jam and print-quality issues. The following section lists the settings and their possible values in the Diagnostics menu. The default value for each setting is the one that has an asterisk (*) next to it. Table 40. Diagnostics menu Item Values Explanation PRINT EVENT LOG No values available. Press the SELECT ( ) button to generate a list of the 50 most recent entries in the event log.
Service menu (service PIN codes) Authorized HP service technicians can use this menu to gain access to printer settings that are reserved for service personnel. The service menu is protected by use of a personal identification number (PIN). When you select SERVICE from the list of menus, you are prompted to type an eight-digit PIN code. Note The printer automatically exits the service menu after about one minute if no menu items are selected or changed.
Service ID This information appears on the configuration page (see “Configuration page” on page 241), which eliminates the need for customers to keep paper receipts for proof of the warranty. Because the printer does not have an internal clock, the availability of the service ID date depends on the printer being connected to a source that can provide the date, in this case a time server on the same network as the printer.
Printer resets and power-on modes Cold reset A cold reset unlocks menus that have been previously locked and sets all control panel menu items (including EIO settings) back to the factory defaults. However, it does not clear the values in the service menu (such as the serial number and page counts). Note Before performing a cold reset, print a menu map and a configuration page (see “Menu map” on page 240 and “Configuration page” on page 241).
Hard-disk initialization CAUTION A hard-disk initialization erases and reformats the printer hard disk. Perform a hard disk initialization only if an error code on the control panel indicates an EIO disk error. Always try initializing the hard disk before replacing it. Note Before performing a hard-disk initialization, print a menu map and a configuration page (see “Menu map” on page 240 and “Configuration page” on page 241).
Self test 1. Turn the printer power off. 2. Hold down the SELECT ( ) button, and then turn the printer power on. Continue holding down the SELECT ( ) button until all three printer control panel lights flash once and then remain on. This might take up to 10 seconds. 3. Press the UP ARROW ( highlighted. ) button or the DOWN ARROW ( ) button until SELF TEST is 4. Press the SELECT ( ) button. The printer continues the power-on sequence and begins to continuously printing configuration pages. 5.
Test pages Printing test pages helps you determine whether or not the printer engine and the formatter are functioning. Engine test page To verify that the printer engine (all printer components except the formatter, formatter DIMMs, EIO products, and the stacker or stapler/stacker) is functioning, print an engine test page. Use a small, non-metallic, pointed object to depress the test-page switch, which is located on the right side of the printer (callout 1).
Interface troubleshooting Communications checks Note Communication problems are normally the customer’s responsibility. Time spent attempting to resolve these problems might not be covered by the Hewlett-Packard product warranty. Refer the customer to the network administrator for assistance in troubleshooting network problems. If the printer is not connected directly to a Windows or MS-DOS-based host, see “EIO troubleshooting” on page 255.
Jetdirect page A B C Figure 205. D Jetdirect page A. HP Jetdirect Configuration If the EIO Jetdirect card properly installed and the printer completes its internal diagnostics, the I/O CARD READY status message prints. If communication is lost, an I/O NOT READY status message prints, followed by a two-digit error code. See the HP Jetdirect Network Interface Configuration Guide for further details and recommended action. B.
Display-message troubleshooting The following tables explain the messages that might appear on the control-panel display or in the event log. Alphabetical printer messages and their meanings are listed in “Alphabetical printer messages” on page 258, and numerical printer messages are listed in “Numerical printer messages” on page 274. Note Not all messages are described in the tables; the messages that are not listed are self-explanatory.
Alphabetical printer messages Note Not all messages are described in the tables; the messages that are not listed are self-explanatory. Table 41. Alphabetical printer messages Message Description ACCESS DENIED MENUS LOCKED An attempt has been made to Contact the network systems modify a printer menu item, but administrator to change settings. the network systems administrator has enabled the control-panel security mechanism.
Table 41. Alphabetical printer messages (continued) Message Description CLOSE TOP COVER For help press The top cover is open or the top 1. Press the HELP ( ) button for cover switch (SW101) is defective. information. 2. Close the top cover. 3. Replace the top cover switch (SW101). See figure 212 on page 335. DATA RECEIVED To print last page press The printer received data and is Press the SELECT ( waiting for a form feed. When the continue. printer receives another file, the message should disappear.
Table 41. Alphabetical printer messages (continued) Message Description Action EIO DISK X NOT FUNCTIONAL For help press The EIO disk in slot X is not working correctly. 1. Remove the EIO disk from the indicated slot and reinstall it. 2. If the error persists, replace the EIO disk drive ENVELOPE FEEDER EMPTY The envelope feeder is empty. 1. Refill the envelope feeder. 2. Turn off the printer. 3. Remove and then reinstall the accessory. Turn the printer on. 4.
Table 41. Alphabetical printer messages (continued) Message Description Action INSERT OR CLOSE TRAY XX For help press Tray XX must be inserted or closed before the current job can be printed. 1. Press the HELP ( ) button for detailed information. 2. Press the UP ARROW ( ) button and the DOWN ARROW ( ) button to step through the instructions. 3. If the error persists, verify that the indicated tray’s media-size sensor (PS102, SW801, or SW1) is properly operating.
Table 41. Alphabetical printer messages (continued) Message Description INSTALL FUSER For help press The fuser is either not installed or 1. The fuser is not fully seated not correctly installed in the or has been removed and printer. must be reinstalled for printing to continue. See “Fuser” on page 162. ● If the fuser is in the printer, remove and reinstall it. ● If the fuser is not in the printer, install it. 2.
Table 41. Alphabetical printer messages (continued) Message Description LOAD TRAY XX: For help press Tray XX is either empty (based on 1. Press the HELP ( ) button the operation of the paper sensor) for detailed information. or configured for a type and size 2. Press the UP ARROW ( ) other than that specified in the button and the job. No other tray is available. DOWN ARROW ( ) button to step through the instructions. 3.
Table 41. Alphabetical printer messages (continued) Message Description Action NON HP CARTRIDGE DETECTED The printer has detected that an HP print cartridge is currently installed. If a new HP cartridge has been installed, this message appears for about 20 seconds and then is replaced by the READY message. 1. If the print cartridge appears to be an authentic HP cartridge, try installing another HP print cartridge that has the same shipment lot number.
Table 41. Alphabetical printer messages (continued) Message Description Action OUTPUT BIN 1 FULL REMOVE ALL PAPER FROM BIN The stacker or stapler/stacker output bin is full and must be emptied in order to continue printing. 1. Remove the media from the output bin. 2. If the error persists, verify that the output bin flapper (the four plastic paddles hanging down in front of the output bin rollers) can move freely. 3. Replace the stacker or stapler/stacker.
Table 41. Alphabetical printer messages (continued) Message Description RAM DISK DEVICE FAILURE The RAM disk had a critical failure 1. Turn the printer power off, and can no longer be used. and then on again. 2. If this error persists, a defective DRAM DIMM might be installed in the printer (on the formatter). Replace the DRAM DIMM(s). The procedure for replacing a DRAM DIMM is the same as replacing a firmware DIMM. See “Firmware DIMM” on page 160.
Table 41. Alphabetical printer messages (continued) Message Description Action REPLACE CARTRIDGE No toner remains in the print cartridge. Printing can continue until the toner supply is depleted. 1. Replace the print cartridge to continue printing. 1. Press the HELP ( ) button for detailed information. 2. Press the UP ARROW ( ) button and the DOWN ARROW ( ) button to step through the instructions. 3. Supplies-ordering information is also available from the embedded Web server. 4.
Table 41. Alphabetical printer messages (continued) Message Description SIZE MISMATCH TRAY XX= For help press The tray is loaded with media that 1. Adjust the side and rear is longer or shorter in the feed paper guides against the direction than the size setting for paper. From the control the tray. panel, set the tray 1 paper size to the media size that will be used in tray 1. 2.
Table 41. Alphabetical printer messages (continued) Message Description Action Fewer than 70 staples remain in 1. Press the HELP ( ) button the optional stapler/stacker staple for detailed information. cartridge. Printing will continue 2. Press the UP ARROW ( ) until the STAPLER OUT OF STAPLES button and the Note: message appears on the printer DOWN ARROW ( ) button to The stapler/stacker LED is control-panel display. step through the instructions. continuously illuminated green (this 3.
Table 41. Alphabetical printer messages (continued) Message Description Action TRAY XX CONTAINS UNKNOWN MEDIA The media type or size in the specified tray cannot be determined. 1. To change the media type, press the SELECT ( ) button. Use the UP ARROW ( ) button and the DOWN ARROW ( ) button to scroll to the type, and then press the SELECT ( ) button to select it. 2. To change the media size to Letter, A4, Executive, B5 JIS, A5, or Legal, leave the tray switch in the “standard” position. 3.
Table 41. Alphabetical printer messages (continued) Q2431-90912 Message Description Action TRAY XX SIZE= For help press A tray was installed with the 1. Use the control panel to standard/custom switch set to select the appropriate custom “custom”, or with the paper guides paper size. Press the in a non-standard configuration. SELECT ( ) button. 2.
Table 41. Alphabetical printer messages (continued) Message Description TRAY XX TO CHANGE TYPE PRESS The printer is reporting the current 1. To change the media type, configuration of tray XX. The tray press the SELECT ( ) button. Use the switch is in the “standard” UP ARROW ( ) button and position. the DOWN ARROW ( ) button to scroll to the type, and then press the SELECT ( ) button to select it. 2.
Table 41. Alphabetical printer messages (continued) Message Description TRAY XX SIZE SPECIFIED BY USER The printer is reporting the current 1. To change the media type, configuration of tray XX. The tray press the SELECT ( ) switch is in the “custom” position. button. Use the UP ARROW ( ) button and the DOWN ARROW ( ) button to scroll to the type, and then press the button to select it. SELECT 2.
Numerical printer messages Table 42. Numerical printer messages Message Description 10.00.00 The printer is unable to read the 1. Open the top cover, remove electronic information (e-label) on the print cartridge, and the print cartridge so that the reinstall it. See “Print printer can keep track of the page cartridge” on page 137. count for the print cartridge. 2. Install a new HP print cartridge. XX Description 3.
Table 42. Numerical printer messages (continued) Q2431-90912 Message Description Action 13.XX.YY JAM For help press A jam exists in the media path. 1. Press the HELP ( ) button for detailed information about clearing the jam. 2. Press the UP ARROW ( ) button and the DOWN ARROW ( ) button to step through the instructions. 3. If the media is folding into an accordion shape, make sure the shutter on the print cartridge opens as you insert the cartridge. Replace any defective print cartridge. 4.
Table 42. Numerical printer messages (continued) Message Description 13.01.00. or 13.03.00 JAM IN TRAY X For help press A page is jammed in tray X. or 13.03.00 PAPER JAM OPEN INPUT TRAYS THEN OPEN AND CLOSE TOP COVER 276 Troubleshooting Action 1. Press the HELP ( ) button for detailed information about A 13.01.00 error message clearing the jam. indicates that the media did not 2.
Table 42. Numerical printer messages (continued) Message Description Action CONTINUED 13.01.00. or 13.03.00 JAM IN TRAY X For help press CONTINUED CONTINUED 11. Verify that the top-of-page sensor (PS103) is operating correctly and that the sensor flag can freely move. Replace the sensor if it is not operating correctly. See “Printer switches and sensors” on page 336. 12. Replace the DC controller PCA. See “DC controller PCA” on page 181. or 13.03.
Table 42. Numerical printer messages (continued) Message Description Action 13.06.00 and 13.12.00 JAM INSIDE REAR DOOR For help press A page is jammed near the rear output door. 1. Press the HELP ( ) button for detailed information about clearing the jam. 2. Press the UP ARROW ( ) button and the DOWN ARROW ( ) button to step through the instructions. 3. Check the paper width and fuser delivery sensors (PS106, PS108) and verify that the sensor arms move freely.
Table 42. Numerical printer messages (continued) Message Description 13.12.07 JAM IN STAPLER There is a jam in the stapler 1. Press the HELP ( ) button cartridge (the stapler did not finish for detailed information. stapling but its motor was able to 2. Press the UP ARROW ( ) return to its home position). button and the DOWN ARROW ( ) button to step through the instructions. 3. Remove any jammed paper from the stapler/stacker. 4. Remove the staple cartridge from the stapler unit. 5.
Table 42. Numerical printer messages (continued) Message Description Action 13.12.10 JAM IN OUTPUT DEVICE For help press A page did not arrive at the stacker or staple/stacker inlet sensor in the specified time. 1. Press the HELP ( ) button for detailed information. 2. Press the UP ARROW ( ) button and the DOWN ARROW ( ) button to step through the instructions 3. Open the jam-access door and remove all of the pages. Close the access door. 4.
Table 42. Numerical printer messages (continued) Message Description Action 13.98.00 OPEN INPUT TRAYS THEN OPEN AND CLOSE TOP COVER ● The face-up tray was opened when the printer was attempting to send a page to the duplexer. ● A page shorter than 200 mm (7.87 inches) was sent to the duplexer. ● A page less than 120 mm (4.72 inches) in width was sent to the duplexer. ● A multi-feed paper jam has occurred. 1. Remove any jammed media from the paper path. 2. Open and close the top cover. 3.
Table 42. Numerical printer messages (continued) Message Description Action 40 EIO X BAD TRANSMISSION To continue press A connection with the card in EIO slot X has been broken abnormally. 1. Press the SELECT ( ) button to resume printing. Note: A loss of data will occur. 2. Check that all of the cables are connected to the EIO ports and that the EIO board is seated properly. 3. If possible, print to another network printer to verify the network is working properly. 4.
Table 42. Numerical printer messages (continued) Q2431-90912 Message Description 49.XXXX PRINTER ERROR To continue turn off then on A critical firmware error has occurred that caused the processor on the formatter to abort the operation. Action 1. Press CANCEL JOB to clear the print job from the printer memory. 2. Turn the printer off and then on. This type of error can be caused 3. Go to htpp://www.hp.com/ by invalid print commands, support/LJ4200 or htpp:// corrupt data, or invalid operations. www.
Table 42. Numerical printer messages (continued) Message Description Action Continued 49.XXXX PRINTER ERROR Continued Continued 11. Replace the DIMM or EIO device caused the error message. 12. Remember to reconnect all of the cables that connect the printer to the network or computer. 13. If this error message persists, replace the firmware DIMM. See “Firmware DIMM” on page 160. 14. Replace the formatter assembly. See “Formatter assembly” on page 161 49.24.
Table 42. Numerical printer messages (continued) Message Description Action 51.XY PRINTER ERROR For help press A printer error has occurred. 1. Press the SELECT ( ) button to continue. 2. Turn the printer off and then on. 3. Reseat the connectors between the laser/scanner and DC controller PCA (J83 and J84). 4. Replace the laser/scanner assembly. See “Laser/ scanner assembly” on page 173. 5. Replace the DC controller PCA. See “DC controller PCA” on page 181.
Table 42. Numerical printer messages (continued) Message Description 55.X PRINTER ERROR For help press The DC controller is not 1. Press the SELECT ( ) button communicating with the formatter. to continue. The problem could be caused by 2. Turn the printer off and then a timing error or an intermittent on. connection. 3. Reseat the connectors between the DC controller PCA and the formatter. 4. If the problem persists, replace the DC controller PCA. See “DC controller PCA” on page 181. 5.
Table 42. Numerical printer messages (continued) Message Description 57.X PRINTER ERROR To continue turn off then on A printer fan is not functioning. or Action Turn the printer off and then on. 57.3 Cartridge fan error (F2) X Description 3 EP cartridge fan, right side (LJ 4300 only) 4 Main cooling fan, left side 57.3 EP FAN FAILURE or 57.4 MAIN FAN FAILURE 1. Reconnect the connector between the fan and the DC controller PCA (location J78). 2. Replace the fan.
Table 42. Numerical printer messages (continued) Message Description Action 58.X PRINTER ERROR For help press A memory error has been detected. 1. Turn the printer off and then on. alternates with 58.X PRINTER ERROR To continue turn off then on 58.2 Air temperature sensor X 2 3 4 Description air-temperature sensor DC controller power supply 1. Turn the printer off and then on. 2.
Table 42. Numerical printer messages (continued) Message Description Action 59.XY PRINTER ERROR For help press A printer-motor error has occurred. 59.00, 59.10, 59.20 Motor failure alternates with 59.XY PRINTER ERROR To continue turn off then on X 0 1 2 4 A Description main-motor error motor startup error motor rotation error EP-motor error (LJ 4300 only) EP-motor error (LJ 4300 only) Y Description Y=0 1. Turn the printer off and then on. 2.
Table 42. Numerical printer messages (continued) Message Description Action 59.4 EP MOTOR ROTATION ERROR (LJ 4300 only) The print-cartridge drive motor (LJ 4300 only) is not functioning properly. 1. Turn the printer off and then on. 2. Replace the print cartridge. 3. Reconnect the EP-motor wire-harness on the DC controller PCA (location J86). 4. Replace the EP motor. See “Print-cartridge motor (HP LaserJet 4300 series printer only)” on page 175. 5. Replace the DC controller PCA.
Table 42. Numerical printer messages (continued) Message Description The tray 4 lifter-motor is not 60.4 TRAY 4 LIFTER MOTOR FAILURE functioning. Tray 4 can be a 500-sheet feeder or 1,500-sheet feeder accessory. Action 1. Turn the printer off and then on. 2. If the error persists. turn the printer off. 3. Verify that the tray 4 lifter wire-harness is fully seated in its connector on the sheet feeder PCA. 4. Replace the tray 4 lifter assembly.
Table 42. Numerical printer messages (continued) Message Description Action 66.12.XX OUTPUT DEVICE FAILURE For help press A stacker or stapler/stacker error has occurred. 1. Press the HELP ( ) button for detailed information. 2. Press the UP ARROW ( ) button and the DOWN ARROW ( ) button to step through the instructions. 3. Turn the power off. 4. Verify that the stapler/stacker is installed correctly and that its electrical connector is seated in the connector on the printer. 5. Turn the power on. 6.
Table 42. Numerical printer messages (continued) Message Description 68.X PERMANENT STORAGE FULL For help press A nonvolatile storage device is 1. Press the SELECT ( ) button full. Pressing the SELECT ( ) to continue. button should clear the message. 2. For 68.0 errors, turn the printer off and then on. Printing can continue, but behave 3. If a 68.0 error persists, unexpected in response to the Initialize NVRAM. See the changed settings.
Table 42. Numerical printer messages (continued) Message Description Action 79.XXXX PRINTER ERROR To continue turn off then on A critical hardware error has occurred. 1. Turn the printer off and then on. 2. If the problem persists, reseat the firmware DIMM. 3. Reseat the formatter. 4. Go to htpp://www.hp.com/ support/LJ4200 or htpp:// www.hp.com/support/ LJ4300. Select Download Drivers and Software. Check for the latest firmware image version at the bottom of the page.
Paper-path troubleshooting Overview If a jam message appears on the printer control-panel display, look for jammed paper or other print media in the locations that are indicated in the following figure. Then see the tables in this section for information about clearing the jam. You might need to look for media in locations other than those specified in the jam message. If the location of the jam is not obvious, look first in the top-cover area underneath the print cartridge.
Paper-jam recovery This printer can automatically provide paper-jam recovery. You can use the jam-recovery to automatically reprint jammed pages. Select whether or not you want the printer to attempt to reprint jammed pages. ● AUTO Printer will attempt to reprint jammed pages. ● OFF Printer will not attempt to reprint jammed pages. Hint To improve print speed and increase memory resources, you may want to disable paper jam recovery.
Avoiding paper jams Use this table to help avoid specific types of paper jams Table 43. Common causes of paper jams Cause Solution The print media does not meet HP recommended Use only media that meets HP specifications. See media storage and use specifications. chapter 1 in this manual or the HP print media guide (available at http://www.hp.com/support/ljpaperguide) for media recommendations. A supply item is installed incorrectly, which causes repeated jams.
Persistent jams If jams occur repeatedly, use the information in this section to diagnose the root cause of the problem. The tables in this section list possible causes and recommended solutions for jams in each area of the paper path. The information is listed in the order in which you conduct the investigation. In general, items at the beginning of the list are relatively minor repairs. Items at the end of the list are more significant repairs.
General paper-path troubleshooting Use the following information to isolate the cause of the problem. When you have identified the cause, use the tables that follow to find a recommended solution. ● View or print the event log to determine if a particular jam error occurs more often than others. Try to identify a pattern. ● View or print the event log, to determine the frequency of a particular jam.
Paper-path test This test generates one or more test pages that can be used to isolate the cause of jams. To isolate a jam, you can specify which input tray to use, which output bin to use, specify whether to use the duplex path, and the number of pages to print. Printing multiple pages helps to isolate intermittent jam problems. The following options are available for this test. ● Print test page. This option uses factory default settings to run the paper path test.
Jams in tray 1 Table 44. Causes of tray 1 jams Cause Solution The pickup roller is dirty, worn, or damaged. Clean the pickup roller. If it is dirty after cleaning, or if it is worn or damaged, replace the pickup roller. The separation pad is dirty, worn, or damaged. Clean the separation pad. If it is dirty after cleaning, or if it is worn or damaged, replace the separation pad. The drive gears are damaged. Check the drive gears in the tray 1 pickup assembly.
Jams in tray 3 and/or tray 4 Table 46. Causes of tray 3 and or tray 4 jams Cause Solution The feed or separation rollers are dirty, worn, or damaged. Clean the rollers. If they are dirty after cleaning, or if they are worn or damaged, replace the rollers. See “500-sheet feed rollers” on page 204 and/or “1,500-sheet feeder feed rollers” on page 214 and “1,500-sheet feeder separation roller” on page 214. The pickup roller is worn or damaged. Replace the pickup roller.
Jams in the paper path Table 47. Causes of paper-path jams Cause Solution The cartridge shutter open/close mechanism is damaged. The shutter in the print cartridge should open as you insert the print cartridge. If the shutter does not open, replace the print cartridge. The registration roller is dirty, worn, or damaged. (This applies to jams that occur before the registration rollers.) Clean the registration roller assembly if it is dirty.
Media transport problems If media is feeding incorrectly, use the information in this section to identify and resolve the problem. Multiple pages feed Table 49. Causes for multiple pages feeding Cause Solution The tray 1 separation pad is worn. Replace the separation-pad assembly. Too much media (particularly envelopes) is loaded in tray 1. Remove some of the media and resend the print job. The separation rollers in the tray are worn or damaged Replace the rollers.
Paper is skewed Table 52. Causes for skewed paper Cause Solution Paper dust or dirt has accumulated on the tray feed Clean or replace the rollers. roller or separation roller. Q2431-90912 The tray feed roller and separation roller are worn irregularly. Replace the affected roller. The registration assembly is defective. Replace the registration assembly.
Image-formation troubleshooting The image formation system is the central hub of the printer. During image formation, an image of toner is formed and then fused onto the paper.
Overhead transparency defects Overhead transparencies may display any of the image quality problems that any other type of media will, as well as defects specific to printing on transparencies. In addition, because transparencies are pliable while in the print path, they are subject to being marked by the media-handling components. Note Allow transparencies to cool at least 30 seconds before handling them. ● In the printer driver’s Paper tab, select Transparency as the media type.
Image defects Overview This section helps you define print-quality problems and what to do to correct them. Often print-quality problems can be handled easily by making sure that the printer is properly maintained, using print media that meets HP specifications, or running a cleaning page. Note Do not use letterhead paper that is printed with low-temperature inks, such as those used in some types of thermography. Do not use raised letterhead. The printer uses heat and pressure to fuse toner to the paper.
Check the print cartridge Image-formation defects are often the result of problems with the print cartridge. If you suspect that the print cartridge is the source of the problem, replace the print cartridge before troubleshooting image defects. Use the following list to make sure that the print cartridge is still operable. Note ● Check the print cartridge to see if it has been disassembled or refilled. ● Inspect the cartridge for toner leaking through worn seals.
Half self-test functional check The electrophotographic process can be subdivided into the following stages: ● Cleaning (removes excess toner from the drum surface) ● Conditioning (places a uniform electrical charge on the drum) ● Writing (the laser strikes the surface of the drum to create an electrostatic image) ● Developing (forms the toner image on the drum) ● Transferring (charges transfer the image to the print media) ● Fusing (heat and pressure produces a permanent image) The purpose of t
Image defect tables Table 54.
Table 54. Print quality image defects (continued) See “Black page” on page 322. 312 Troubleshooting See “Blank (or white) page” See “Dark print” on page 324. on page 323.
Table 55. Light print (partial page) Possible cause Recommended action(s) The print cartridge is not installed correctly. ● Toner supply is low or toner cartridge developer is defective. Transfer roller is worn or contaminated or maintenance might be due. Remove and then reinstall the print cartridge. The top cover should completely close when the cartridge is fully seated. 1. Shake the print cartridge gently to redistribute the toner. 2. Replace the cartridge.
Table 57. Specks or dots Possible cause Recommended action Specks Specks might appear on a page after a jam has been cleared. Print two to three more pages and see if they disappear. There is dirt in the printer. The print cartridge has damaged components. 1. Print a few more pages and see if the problem corrects itself. 2. Clean the inside of the printer (see chapter 4) 3. Process a printer cleaning page. See “Running the cleaning page manually” on page 56.
Table 58. Drop outs and character voids Possible cause Recommended action(s) Printing on the wrong side of the paper. 1. Check the arrow on the paper wrapper. Make sure that the The label on the ream of paper indicates paper loaded corresponds with the arrow pointing up in which side to print on. The different tray 1, or pointing down in the other trays. surface properties of some papers 2. Turn over the stack of paper in the tray.
Table 59. Lines Possible cause Recommended action(s) Vertical lines (in the paper path direction) The print cartridge is not seated correctly. ● Remove the print cartridge and the reinstall it. The top cover should be able to completely close when the print cartridge is fully seated. Defective print cartridge. ● Worn or dirty fuser roller. ● Static eliminator teeth (just beyond the transfer roller) are contaminated or defective. ● Light is leaking into the printer.
Table 60. Grey background Possible cause Recommended action(s) The media does not meet specifications 1. Turn over the stack of media in the tray. Also try rotating the or is not stored properly. media 180 degrees. 2. Check the media for type and quality. Replace the media, and advise the customer to use the HP recommended media and to store it correctly. See “Paper specifications” on page 9. Clean the inside of the printer (see chapter 4). Install a new print cartridge.
Table 62. Repeating defects and repeating images Possible cause Recommended action(s) The print cartridge or fuser is damaged. 1. Inspect the drum for scratches or other damage. Replace The circumference of the the print cartridge for defects that repeat at 37.7 mm photoconductive drum inside of the print (1.5 inches), 62.8 mm (2.5 inches), 54.0 mm (2.1 inches), cartridge is 94.2 mm (3.7 inches). If the and/or 94.2 mm (3.7 inches). defect repeats at this interval, the defect 2.
Table 64. Skew Possible cause Recommended action(s) The media does not meet specifications 1. Turn over the stack of media in the tray. Also try rotating the or is not stored properly. media 180 degrees. 2. Check the media for type and quality. Replace the media, and advise the customer to use the HP recommended media and to store it correctly. See “Paper specifications” on page 9. The media is not loaded properly or the trays are not adjusted correctly.
Table 67. White lines Possible cause Recommended action(s) White lines in the paper path Toner supply is low or the print cartridge 1. Shake the print cartridge gently to redistribute the toner. is defective. 2. Replace the cartridge. Dirt in the laser path. ● The fuser is defective. ● Dirty mirror in the laser/scanner. ● Clean the laser path. Remove the laser/scanner assembly (see “Laser/scanner assembly” on page 173) and check for dirt or other obstructions in the beam path. Replace the fuser.
Table 69. White spots on black Possible cause Recommended action(s) The media does not meet specifications 1. Turn over the stack of media in the tray. Also try rotating the or is not stored properly. media 180 degrees. 2. Check the media for type and quality. Replace the media, and advise the customer to use the HP recommended media and to store it correctly. See “Paper specifications” on page 9 The printers operating environment does not meet specifications. ● The print cartridge is defective.
Table 72. Black page Possible cause Recommended action(s) The print cartridge is defective. ● The high-voltage connector springs are dirty or damaged. ● The laser beam drive circuit or high-voltage circuit is defective (it is not supplying the correct voltage). Replace the print cartridge. The high-voltage connectors protrude into the print cartridge cavity. Clean the springs if they are dirty. Replace the springs if they are damaged or missing. 1.
Table 73. Blank (or white) page Possible cause Recommended action(s) Software configuration (intermittent problem). ● Network configuration. Some sharing devices on networks might generate a blank page as a print job separator. ● Multiple feeds. The printer might be feeding two or more pages at once (intermittent problem). ● The sealing tape was left in the print cartridge. ● Remove the sealing tape. The print cartridge is empty or defective. ● Replace the print cartridge.
Table 74. Dark print Possible cause Recommended action(s) Wrong toner density setting. ● The print cartridge drum is close to the end of its expected life. ● Access the print-quality menu at the control panel, and adjust the toner density setting. See “Print Quality submenu” on page 46. Replace the print cartridge. The media does not meet specifications 1. Turn over the stack of media in the tray. Also try rotating the or is not stored properly. media 180 degrees. 2.
Repetitive defects troubleshooting Defects on printer rollers can cause image defects to appear at regular intervals on the page. These defects appear at regular intervals that correspond to the circumference of the roller causing the defect. Measure the distance between defects that recur on a page. Use table 75 or the repetitive defect ruler (figure 207) to determine which roller is causing the defect. To resolve the problem, try cleaning the roller first.
Troubleshooting the stacker and the stapler/stacker Overview When troubleshooting the stacker or stapler/stacker it might be difficult to distinguish whether the malfunction relates to the stacker, stapler/stacker or to the printer. The troubleshooting procedures in this section assume the stacker or stapler/stacker is installed on a printer that is working normally. Always correct any printer errors before attempting to troubleshoot the stacker or stapler/stacker.
Jam errors Stacker and stapler/stacker paper path Delivery area Printer connection area Figure 208. Stacker and stapler/stacker paper path Stacker paper path test 1. Press the SELECT ( ) button to open the menus 2. Use the UP ARROW ( ) button or the DOWN ARROW ( ) button. and then press the SELECT ( ) button to scroll to DIAGNOSTICS, 3. Use the UP ARROW ( ) button or the DOWN ARROW ( ) button. TEST, and then press the SELECT ( ) button to scroll to PAPER PATH 4.
Stapler/stacker paper path test 1. Press the SELECT ( ) button to open the menus. 2. Use the UP ARROW ( ) button or the DOWN ARROW ( ) button. DEVICE, and then press the SELECT ( ) button to scroll to CONFIGURE 3. Use the UP ARROW ( ) button or the DOWN ARROW ( ) button. STACKER, and then press the SELECT ( ) button to scroll to STAPLER 4. Use the UP ARROW ( ) button or the DOWN ARROW ( ) button to scroll to STAPLES, and ) button. Scroll to ONE, and then press the SELECT ( ) button.
Table 76. Printer connection area jam troubleshooting (continued) Possible cause Recommended action(s) Printer connection area jam without the leading edge of the media sticking out of the top of the printer. The deflector cannot move freely or is defective. ● Inspect the deflector. Verify that it can move freely and is not damaged. If necessary, replace the stacker or stapler/stacker. The deflector solenoid (SL1101) is defective. ● The stacker of stapler/stacker PCA is defective.
Paper transport errors Table 78. Paper transport error troubleshooting Possible cause Recommended action(s) Worn, dirty, or defective rollers. ● The feed guide is damaged, causing the leading edge of the media to be bent. ● Obstruction in the paper path causes skewed print. ● Inspect all of the stacker or stapler/stacker rollers. Clean any dirty rollers. If necessary, replace the stacker or stapler/stacker. Inspect the feed guide. If, necessary, replace the stacker or stapler/ stacker.
Component errors Note Component errors will cause a control panel message to appear on the control-panel display. For more information about these messages, see “Alphabetical printer messages” on page 258 and “Numerical printer messages” on page 274. Table 80. Component error troubleshooting Q2431-90912 Possible cause Recommended action(s) The jogger mechanism or motor (M1102) is defective (stapler/stacker only). ● The paddle mechanism or motor (M1101) is defective (stapler/stacker only).
Printer component locations Main printer parts 2 1 3 4 5 6 Figure 209. Location of main printer parts (1 of 4) 1. Laser/scanner assembly 2. Duplex pendulum assembly 3. Main drive assembly 4. Lifter drive assembly 5. Paper pickup drive assembly 6.
1 2 3 4 Figure 210. Location of main printer parts (2 of 4) 1. Output delivery assembly 2. Registration roller assembly 3. Tray 1 pickup assembly 4.
1 2 3 Figure 211. Location of main printer parts (3 of 4) 1. Transfer roller 2. Tray 1 pickup roller 3.
1 2 3 Figure 212. Location of main printer parts (4 of 4) 1. Pickup roller 2. Feed roller 3.
Printer switches and sensors 1 2 10 3 4 9 5 8 6 7 Figure 213. Location of printer switches and sensors 1. Output bin full sensor (PS104) 2. Paper size switch (SW102) 3. Top cover open switch (SW101) 4. Paper stack position sensor (PS107) 5. Tray 2 paper sensor (PS101) 6. Tray 1 paper sensor (on the tray 1 pickup assembly; PS105) 7. Pre-feed sensor (PS102) 8. Paper width sensor (PS106) 9. Fuser assembly delivery sensor (PS108) 10.
Printer motors and fans 1 2 3 4 5 Figure 214. Location of printer motors and fans 1. Right-side cooling fan (HP LaserJet 4300 only) 2. Print cartridge motor (HP LaserJet 4300 only) 3. Main drive motor 4. Lifter-drive motor 5.
Printer PCAs 1 2 Figure 215. Location of printer PCAs 1. DC controller PCA 2.
Accessory component locations 500-sheet feeder main parts 1 2 3 4 5 Figure 216. Location of 500-sheet paper feeder main parts 1. 500-sheet feeder lifter drive assembly 2. 500-sheet feeder pickup gear assembly 3. 500-sheet feeder feed roller 4. 500-sheet feeder separation roller (in the tray) 5.
500-sheet feeder switches, sensors, solenoids, and PCAs 1 2 5 3 4 Figure 217. Location of 500-sheet paper feeder switches, sensors, solenoids, and PCAs 1. 500-sheet feeder control PCA 2. 500-sheet feeder paper pickup solenoid (SL801) 3. 500-sheet feeder paper stack position sensor (PS802) 4. 500-sheet feeder paper sensor (PS801) 5.
1,500-sheet feeder main parts 1 2 Figure 218. Location of 1,500-sheet paper feeder main parts (1 of 2) 1. 1,500-sheet feeder lifter-drive assembly 2.
1 2 3 Figure 219. Location of 1,500-sheet paper feeder main parts (2 of 2) 1. 1,500-sheet feeder feed roller 2. 1,500-sheet feeder pickup roller 3.
1,500-sheet feeder switches, sensors, solenoids, and PCAs 1 2 3 4 6 5 Figure 220. Location of 1,500-sheet switches, sensors, solenoids, and PCAs 1. 1,500-sheet feeder control PCA 2. 1,500-sheet feeder paper sensor (SR3) 3. 1,500-sheet feeder paper pickup solenoid (SL1) 4. 1,500-sheet feeder door sensor (SR1) 5. 1,500-sheet feeder paper stack position sensor (SR2) 6.
Stapler/stacker stapler assembly 1 Figure 221. Location of the stapler/stacker stapler unit 1.
Stacker and stapler/stacker switches and sensors 7 6 1 5 2 4 Figure 222. 3 Location of the stacker and stapler/stacker switches and sensors 1. Jogger home position sensor (stapler/stacker only; PS1105) 2. Door open switch (SW1101) 3. Paper inlet sensor (PS1101) 4. Paper delivery sensor (PS1102) 5. Delivery roller disengaging sensor (stapler/stacker only; PS1104)) 6. Paddle home position sensor (stapler/stacker only; PS1103) 7.
Stacker and stapler/stacker motors and solenoids 1 5 4 3 2 Figure 223. Location of the stacker and stapler/stacker motors and solenoids 1. Clamp solenoid (stapler/stacker only; SL1102) 2. Deflector solenoid (SL1101) 3. Feed mechanism and motor (M1103) 4. Paddle mechanism and motor (stapler/stacker only; M1101) 5.
Stacker and stapler/stacker PCAs 1 2 Figure 224. Location of the stacker and stapler/stacker PCAs 1. Stacker or staple/stacker LED PCA 2.
Printer and accessory wiring diagrams Figure 225.
Figure 226.
Figure 227.
Figure 228.
Figure 229.
Figure 230.
Figure 231.
Figure 232.
DC controller block diagram Paper feed clutch (3-pin; J89) Memory chip sensor (2-pin; J97) (from the print cartridge) Laser/Scanner PCA (7-pin; J84) Paper handling power connector (8-pin; J96) Output bin full sensor (3-pin; J83) Control Panel (8-pin; J77) Tray 1 pickup solenoid (2-pin; J79) Scanner PCA (12-pin; J83) DC controller top Tray 1 paper sensor Narrow media sensor Top of page sensor Paper feed sensor (12-pin; J87) Engine test button (SW830) Top cover sensor (3-pin; J95) Right-side fan L
General timing diagrams Figure 234.
Figure 235.
Figure 236.
360 Troubleshooting Q2431-90912
8 Parts and diagrams Contents Ordering parts, supplies, and getting support . . . . . . . . . . . . . . . . . . . . . 362 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 362 Related documentation and software . . . . . . . . . . . . . . . . . . . . . . . . 362 Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 362 HP-authorized resellers and support . . . . . . . . . . . . . . . . . . . . . .
Ordering parts, supplies, and getting support Ordering information This chapter contains field replaceable unit (FRU) and accessory part numbers. Replacement parts can be ordered from the HP Services. Go to http://www.hp.com/go/parts/ for information about ordering service parts in your area. Go to http://www.hp.com/go/partsinfo/ for the online HP service parts identification tool (HP PartSurfer). CAUTION Use only the parts and accessories that have been specifically designed for this printer.
HP provides free telephone support during the product warranty period. When you call, you will be connected to a responsive team waiting to help you. For the number you should call in your country/region, see the support sheet that came in the box with your printer. Before calling have the following information available: ● product name (for example, HP LaserJet 4300 dtns) ● product serial number (found on the underside of the control-panel door.
Accessories and supplies The following items are available through your local authorized HP Services provider. To find a dealer near you, see “Ordering information” on page 362 or “Worldwide service and support offices” on page 30. Table 82.
Table 83.
Table 85.
Table 86. Documentation Item Part number Description or use Service training kit Q2431-67907 A guide to HP LaserJet 4200 and HP LaserJet 4300 service training. Training service and support manual on CDROM Q2431-60114 Print Media Guide For The Hp Laserjet Family Of Printers 5980-8424 ENUS Training materials A guide to using paper and other print media with HP LaserJet printers (available only in English). To obtain an updated version of the media guide, go to http://www.hp.
Parts diagrams and lists 1 10 2 11 12 9 8 3 LJ 4300 4 LJ 4200 5 6 7 Figure 237.
Table 87.
1 LJ 4300 7 2 6 3 4 5 Figure 238.
Table 88.
1 2 3 8 7 6 4 5 Figure 239.
Table 89.
1 2 3 18 LJ 4300 4 17 5 15 16 6 14 7 12 8 13 11 9 10 Figure 240.
Table 90.
6 1 5 4 3 Figure 241. 2 Right-side assemblies Table 91.
1 110-127v 220-240v 2 Figure 242. Power supply and paper feed belt assembly Table 92.
1 2 Figure 243. Main drive assembly Table 93.
Figure 244. Paper-pickup assembly Table 94.
Figure 245. Duplexing pendulum assembly Table 95.
Figure 246. Tray 2 lifter driver assembly Table 96.
10 1 9 8 7 6 5 2 3 4 Figure 247. Paper pickup assembly Table 97.
1 2 3 4 Figure 248. Paper-feed assembly Table 98.
Figure 249. Registration assembly Table 99.
1 2 3 6 5 Figure 250. 4 Tray 1 assembly Table 100.
Figure 251. Output delivery assembly Table 101.
Figure 252. Transfer assembly Table 102.
1 2 3 4 Figure 253.
Table 103.
1 2 3 Figure 254. 500-sheet feeder external covers and panels Table 104.
1 3 Figure 255. 2 500-sheet feeder main assemblies (1 of 2) Table 105.
1 2 3 4 7 5 6 Figure 256.
Table 106.
Figure 257. 500-sheet feeder paper-pickup drive assembly Table 107.
Figure 258. 500-sheet feeder lifter driver assembly Table 108.
1 4 2 3 Figure 259. 500-sheet tray Table 109.
1 2 3 4 6 Figure 260. 5 1500-sheet feeder external covers and panels Table 110.
2 1 3 4 5 7 6 8 Figure 261.
Table 111.
Figure 262. 1,500-sheet feeder paper-pickup drive assembly Table 112.
Figure 263. 1,500-sheet feeder lifter-drive assembly Table 113.
1 2 3 Figure 264. 1,500-sheet feeder paper-pickup assembly Table 114.
1 2 Figure 265. Stacker and stapler/stacker Table 115.
1 Figure 266. Stacker and stapler/stacker Table 116.
Alphabetical parts list Table 117.
Table 117.
Table 117.
Table 117.
Numerical parts list Table 118.
Table 118.
Table 118.
Table 118.
Index Numerics 1,200-dpi resolution 47 1,500-sheet feeder cables 399 capacity 11 connector interface 399 control PCA 220, 343 covers and panels 397 door 215 door sensor 343 door sensor cable 399 feed rollers 214, 342, 402 feeder control PCA 399 front cover stop arm 397 jams 302 lifter-drive assembly 222, 341, 401 lifting mechanism 94 location of main parts 341 main assemblies 399 media size detection 83 media-size sensor 399 media-size sensor cable 399 media specifications 11 media-size sensor 221 operation
assemblies 1,500-sheet feeder 399 500-sheet feeder 391 500-sheet feeder media-size sensor 391 500-sheet feeder sensor cable 393 brake, left 373 brake, right 373 control panel 157 duplexing pendulum 332, 380 fuser 333 illustration and part numbers 371 laser/scanner 76, 332 lifter-drive, printer 332 lifter-drive, 1,500-sheet feeder 341, 401 lifter-drive, 500-sheet feeder 339, 395 main 370 main drive 332, 378 order in which to remove 135 output delivery 333, 386 paper delivery tray, stacker and stapler/stacker
cassettes. See trays CD-ROM, software documentation contents 367 part numbers 367 character sets, selecting 46 character voids in images, troubleshooting 315 charging biases 73 charging process 118, 120 checks.
counts estimated pages remaining for print cartridge 242 jobs processed 242 maintenance 249 pages printed 241, 242 resetting with NVRAM initialization 251 setting for pages 249 Courier font setting 45 covers 1,500-sheet feeder 397 1,500-sheet feeder rear 217 1,500-sheet feeder right-side 218 500-sheet feeder 204, 390 cleaning 55 envelope feeder 385 fan 375 formatter 145 illustration and part numbers 368, 369 inner front right side 375 jam locations 295 jams 89 left-side 151 order in which to remove 135 righ
DLC/LLC setting 52 DOC (Declarations of Conformity) 26 documentation CD-ROM contents 367 ordering 28 ordering related 362 part numbers 367 door open switch stacker 104, 345 stapler/stacker 107, 345 door sensor cable, 1,500-sheet feeder 399 door sensor, 1,500-sheet feeder 343 doors. See covers dots or specks on images, troubleshooting 314 dots per inch (dpi), setting 47 double-sided printing.
EWS (embedded Web server) description 243 Information tab 244 links for support and supplies 245 Networking tab 244 opening 243 requirements 243 setting language 244 Settings tab 244 using for troubleshooting 239, 243 viewing with Printer Status and Alerts 245 exchange numbers accessories and supplies 364 memory, fonts, and mass storage 365 printer maintenance kits 366 expandable memory 3, 8 F face-down tray paper-full sensor 100 factory defaults description 38 restoring 247 restoring using cold reset 251
fuser bias 73 cable 389 cleaning 55 illustration and part numbers 389 jam locations 295 jams 280 life expectancy 59 modes 47 operation 86 order in which to remove 135 over-temperature protection 72 part numbers 366 removing and replacing 162 temperature monitoring 71 troubleshooting 262, 284 voltage monitoring 71 fuser assembly 333 fuser assembly delivery sensor location 336 operation 78 fuser-control circuit 71 fuser delivery sensor 87, 100 fuser heaters 71 fuser thermal switch 71 fuser thermistor monitori
J jams automatic recovery 296 avoiding 297 common causes 297 connection areas 328 delivery areas 329 duplexer 100, 303 envelope feeder detection 97 fuser 280 locations 295 loose toner after clearing 295 paper path 303 persistent 298 printer detection 87 recovery setting 50 recovery settings 50 sensors 100 stacker 105, 327 stapler/stacker 117, 327 tray 1 301 tray 2 301 troubleshooting 276, 277, 278, 279, 280 Japanese VCCI statement 21 Jetdirect print servers.
maintenance agreements 29, 363 kits for printer 366 preventative maintenance notice 242 remaining life of kit components 242 setting count of pages printed 249 setting maintenance interval 249 See also cleaning malfunction error troubleshooting 330 manual feed settings 45, 49 manuals. See documentation margins on envelopes 18 registration settings for printing 46 mass storage devices.
Novell NetWare information on HP Jetdirect page 256 settings 52 number of copies, setting default 44 NVRAM (nonvolatile random-access memory) initialization 251 operation 129 troubleshooting 292, 293 O off-set images, preventing with fluorine coating 124 online help at control panel 37 operating environment specifications 5 operating temperature specifications 8 optimizing resolution 47 options.
paper stack position sensor 1,500-sheet feeder 343 500-sheet feeder 340 location 336 operation 84 paper stack sensor 382 paper transport errors 330 paper tray lifter 80 paper width sensor location 336 operation 100 paper pickup assembly printer 382 parallel interfaces buffer overflow 281 operation 128 part numbers 365 settings 52 testing 255 part numbers accessories and supplies 364 covers and panels 369 main assemblies 371 memory, fonts, and mass storage 365 printer maintenance kits 366 PartnerCare 29, 363
ppm (pages per minute) speed 8 pre-feed sensor location 336 operation 78, 79, 82, 87, 90, 92, 97, 100 preferences. See settings preprinted forms 14 preprinted paper fuser modes 47 print quality problems 306 specifications 308 prepunched paper, user modes 47 pressure roller operation 73 preventing toner from sticking 73 preventative maintenance.
recovery automatic jam 296 settings for jam 50 recycling print cartridges 31, 242 supplies 24 website 31 refilled print cartridges 31 reformatting printer hard disk 252 registration assembly illustration and part number 384 operation 80, 82, 85, 90, 92 removing and replacing 198 registration roller assembly gaining access to 135 location 333 order in which to remove 135 registration roller, cleaning 55 registration settings for printing 46 registration shutter 79, 85 regulatory information Declarations of C
Sensors (continued) paper delivery, stacker and stapler/stacker 345 paper inlet, stacker 105 paper inlet, stacker and stapler/stacker 345 paper size, 1,500-sheet feeder 343 paper stack 382 paper stack position 84, 94, 336 paper stack position, 1,500-sheet feeder 343 paper stack position, 500-sheet feeder 340 paper width 100, 336 paper, 1,500-sheet feeder 343 paper, 500-sheet feeder 340 pickup 97 pre-feed 78, 79, 82, 87, 90, 92, 97, 100, 336 printer 336 stacker 104 stacker and stapler/stacker 345 stapler/sta
specifications, printer environmental 5, 7 space requirements 5 temperature and humidity 8 specks or dots on images, troubleshooting 314 speed and EconoMode 128 data transmission settings 52 dpi resolution settings 47 link for DLC/LLC 52 main motor 121 motors 70 pages per minute 8 scanner motor 121 spilled toner, cleaning 57 SPL (sound power level) ratings 8 stabilizing toner 124 stacker capacity 13 cover 403 deflector solenoid 346 door open switch 345 driver PCA 347 feed mechanism and motor 346 jam detecti
supplies EWS status page 239 memory error 274 ordering 28, 362, 364 ordering with EWS 245 product, part, and exchange numbers 364 recycling 24 returns 31 status 244 status messages generated by Printer Status and Alerts 245 status page, from control panel 41 viewing status with EWS 243, 244 website 242 websites 362 supplies page, EWS 239 supplies status page 41 printing 242 using for troubleshooting 239, 242 support HP-authorized resellers 363 links in EWS 245 service agreements 363 telephone 363 websites 2
top cover sensor 356 top of page sensor 78, 87, 100 connector 356 location 336 top output bin setting destination 44 See also bins torque limiter, 500-sheet feeder 396 training materials 367 website 362 transfer assembly 387 gaining access to 135 order in which to remove 135 removing and replacing 200 transfer charging roller cleaning process 118, 125 operation 73 transfer DC negative bias 73 transfer DC positive bias 73 transfer roller cleaning 54, 55 illustration and part number 371 life expectancy 59 loc
troubleshooting flowchart 234 software 29, 363 tools 239 using control panel information pages 239 using control panel messages 257 using drum rotation functional check 310 using event log 248 using half self-test functional check 310 using paper path test 248 See also messages troubleshooting problem areas buffer overflow 281 components 331 connection areas 328 control panel 236 DC controller 286 delivery areas 329 DIMMs 260 duplexer 258, 266, 274, 293 duplexer fan 287 EIO 255, 260, 282, 294 electrophotogr
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