HP HP LaserJet 1100A Service Manual Copyright© 1998 Hewlett-Packard Co. Printed in USA Manual Part No.
HP LaserJet 1100A Service Manual ______________
© Copyright Hewlett-Packard Company 1998 All Rights Reserved. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. Publication number C4224-90962 First edition, October 1998 Trademark Credits Adobe and PostScript are trademarks of Adobe Systems Incorporated which may be registered in certain jurisdictions. Windows is a U.S. registered trademark of Microsoft Corporation.
Conventions This manual uses the following conventions: The names of major printer parts and assemblies are Capitalized. Color is used to emphasize items which are important to the material under discussion. Bold is used for emphasis, particularly in situations where italic type would be confusing. Italic type is used to indicate related documents or emphasis. NOTE: Notes contain important information set off from the text.
Chapter Descriptions 1 Printer Specifications Contains printer features and product overview, printer specifications, and required safety and compliance statements. 2 Product Operation Contains descriptions of the Control Panel, printer key functionality, scanner Control Panel, paper handling, toner cartridge, and warranty statement.
Contents 1 Printer Specifications Printer description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Firmware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Removal and Replacement Removal and replacement strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Required tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 External assemblies and covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Paper guides removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Document scanner removal . . . . . . . . . . . .
5 Troubleshooting/Maintenance Basic troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 Fatal errors/accessory errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 Image formation troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 Checking the toner cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 Solving image quality problems . . . . . . . . .
8 C4224-90962
1 Printer Specifications Chapter contents Printer description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Firmware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Printer description The HP LaserJet 1100 Printer is the next generation low-cost HP LaserJet printer. It provides 600 dots-per-inch (dpi) LaserJet features and add-on scanner capabilities at the lowest possible price. The scanner is 300 dpi/8 bits per pixel (bpp) and contains an automatic document feed (ADF) holding up to 20 pages. The HP LaserJet 1100 Printer prints eight pages-per-minute (ppm). It provides an excellent Windows printing solution, ease of use, and higher performance.
Hardware description The HP LaserJet 1100 Printer engine prints eight pages per minute. The HP LaserJet 1100 Printer has a compact design with vertical paper trays. There is one main Paper Input Bin with a 125-sheet capacity for continuous, multiple-page printing. Manual, single-sheet printing is possible through the Single Sheet Input Slot. Both trays are center justified for all supported paper sizes. The output tray holds up to 100 sheets.
Firmware description The firmware in the HP LaserJet 1100 Printer includes: • Enhanced PCL 5 with Status Readback • 26 scalable Intellifont Fonts • Full page 600 dpi bitmap • 600 dpi • Pixel Placement, Mosaic Characters • Memory Enhancement technology (MEt) with Hardware Compression/Decompression The HP LaserJet 1100 Printer firmware also has REt and EconoMode functionality. Scan capability for the scanner attachment includes 300 dpi and 256 levels of gray (8 bpp).
Specifications Table 1-1. Printer specifications Environmental specifications Operating environment Storage environment Printer plugged into an AC outlet: • Temperature: 10° C to 32.5° C (50° F to 90.5° F) • Humidity: 20% to 80% (no condensation) Printer unplugged from an AC outlet: • Temperature: 0° C to 40° C (32° F to 104° F) • Humidity: 10% to 90% (no condensation) Acoustics Noise level During printing: • 6.
Table 1-1. Printer specifications (continued) Physical specifications Dimensions (1100) • Width: 367 mm (14.5 inches) • Depth: 306 mm (12.8 inches) • Height: 266 mm (14.9 inches) Weight (cartridge installed) • 7.2 kg (16.1 lb) 1100A • Width: 367 mm (14.5 inches) • Depth: 402 mm (15.8inches) • Height: 378 mm (14.9 inches) • 8.7 kg (19.
Table 1-1. Printer specifications (continued) Scan Speed Up to 8 pages per minute (Letter size paper) Input Capacity Up to 20 pages of regular weight 20 lb (75 g/m2) paper Minimum Paper Size 51 x 89 mm (2 x 3.5 inches) C4224-90962 Maximum Paper Size 216 x 762 mm (8.
FCC compliance 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 it 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 HP LaserJet printer has been designed with several attributes to minimize impacts on our environment. This HP LaserJet printer eliminates: Ozone production The printer uses charging rollers in the electrophotographic process and therefore generates no appreciable ozone gas (O3).
The design of this HP LaserJet printer facilitates the recycling of: Plastics Plastic housing parts have markings according to international standards that enhance the ability to identify plastics for recycling purposes at the end of the printer’s life. HP LaserJet printing supplies In many countries, this product's printing supplies (e.g., toner cartridge, drum, fuser) can be returned to HP through the HP Planet Partners Printing Supplies Environmental Program.
Material safety data sheet The Toner Cartridge/Drum MSDS can be obtained by contacting the HP LaserJet Supplies website at http://www.ljsupplies.com/planetpartners/datasheets.html. If you do not have access to the Internet, try calling the U.S. HP FIRST (fax-on-demand service) at 1-800231-9300. Use Index number 7 for a listing of the Toner Cartridge/Drum Material/Chemical Safety Data Sheets. Non-US customers should refer to the front of this manual for appropriate phone numbers and information.
Additional product stewardship Environmental conformity The design of this HP LaserJet printer facilitates the recycling of: Printer and parts Design for recycling has been incorporated into this printer and its accessories. The number of materials has been kept to a minimum while ensuring proper functionality and high product reliability. Dissimilar materials have been designed to separate easily. Fasteners and other connections are easy to locate, access, and remove with common tools.
Regulatory statements Declaration of Conformity according to ISO/IEC Guide 22 and EN45014 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 1100 Printer Model Number: C4224A Product Options: ALL conforms to the following Product Specifications: Safety: IEC 950:1991+A1+A2+A3+A4 / EN 60950:1992+A1+A2+A3+A4 IEC 825-1:1993 / EN 60825-1:1994 Class 1 (Laser/LED) EMC: 1 CISPR 22
Laser safety statement The Center for Devices and Radiological Health (CDRH) of the U.S. Food and Drug Administration has implemented regulations for laser products manufactured since August 1, 1976. Compliance is mandatory for products marketed in the United States. The printer is certified as a “Class 1” laser product under the U.S. Department of Health and Human Services (DHHS) Radiation Performance Standard according to the Radiation Control for Health and Safety Act of 1968.
Canadian DOC regulations Complies with Canadian EMC Class B requirements. «Conforme á la classe B des normes canadiennes de compatibilité électromagnétiques. «CEM».
Laser statement for Finland LASERTURVALLISUUS LUOKAN 1 LASERLAITE KLASS 1 LASER APPARAT HP LaserJet 1100 Printer -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 (1993) mukaisesti.
2 Product Operation Chapter contents HP LaserJet 1100 Printer control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Printer key functionality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Scanner control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Printer paper handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Toner cartridge information . . . . .
HP LaserJet 1100 Printer control panel Hardware overview The HP LaserJet 1100 Printer’s Control Panel consists of two LEDs and a Go key containing a third LED. There is one amber LED (the Attention LED), and two green LEDs (the Ready LED and the Go LED). The green LEDs are contained in the Go key. If the scanner is attached, there are two additional buttons. Scanner modes are not shown on the printer LEDs and scan keys have no effect on printer functionality.
Table 2-1. Control panel light messages Light status Condition of the printer PowerSave mode (or the printer is off) The printer uses PowerSave mode to conserve energy. Ready The printer is ready to print. Processing Self test page Form Feed Action Low power consumption mode. Pressing the Go key on the printer control panel or printing will awaken the printer from PowerSave mode.
Table 2-1. Control panel light messages (continued) Light status Condition of the printer Action Memory out The page being printed may have been too complex for the memory capacity of the The printer ran out of memory in printer. the middle of a print job. ● See “Memory (DIMMs)” in the HP LaserJet 1100 Printer User Guide to add memory. ● Reset/Printer initialization The printer memory is being reset and all previously sent print jobs are being purged. Or, a printer initialization is taking place.
Printer key functionality The following table contains each printer mode and the result from a short press (when the Go key is pressed for less than five seconds), and the results from a long press (when the Go key is pressed for five or more seconds). Scanner keys have no effect on printer functionality other than the sharing of power resources, which may slow down either function. Table 2-2.
while data is in the printer, a form feed pending will occur. Once the data the printer has received is completely formatted and no more data is in the I/O, the partial page will be ejected due to the form feed pending. Normal printer operation When power is supplied to the printer, all LEDs go on and then off. The LEDs will sequence on and off, one after the other, from the first LED (Go key/LED) to the last LED (Attention LED).
Scanner control panel Figure 2-2 Scanner control panel The scanner Control Panel consists of two keys; a scan key and a copy key. These keys have no effect on the printer other than contention for resources. Scan Pressing the scan key sends a message to the computer that opens the appropriate software application to start the scan or starts a scan depending on how the computer software is configured. If the scan is initiated with no paper in the ADF, an error message will appear on the computer.
Table 2-3.
Table 2-3.
Normal scanner operation At power up or after a Control Panel reset, the scan motor rotates to verify it is ready for operation. Scan functionality is only available through computer software. A scan can be initiated two ways: from the computer or from the scanner Control Panel. When the scan key is pressed on the scanner, it sends a signal to the computer to let it know the firmware is ready to scan.
Printer paper handling There are two vertical input paper trays: the Paper Input Bin and the Single Sheet Input Slot. With the vertical open trays, it is easier for the user to know exactly what paper is in the printer and when the printer is out of paper. There are two paper output paths: the vertical Paper Output Bin and the Front Output Slot in the front of the printer. The user may wish to use the Front Output Slot occasionally since it provides a straighter path and reduces curl.
Legal timing Legal timing refers to the time between the first page picked and the second page picked. Legal timing is the time it takes for a Legal page to go through the engine’s paper path. The HP LaserJet 1100 Printer may run at legal timing if manual feed is selected. If the first manual feed page is followed by a second manual feed page, the first manual feed page will run at legal timing. If a manual feed page is followed by a non-manual feed page, the manual feed page will run at engine speed.
Copy: Letter, Legal, A4, Executive Envelopes - Commercial 10, Monarch, C5, DL, B5, no custom Paper Input Sensor(s) None Paper size change As with the printer, the scanner has to receive paper size information on a job-by-job basis. There is an unchangeable default, but the scan width can be adjusted by the job. The scan length is determined by the media.
Toner cartridge information The Toner Cartridge is designed to simplify replacement of the major “consumable” parts. The Toner Cartridge contains the printing mechanism and a supply of toner. At 5% page coverage, a Toner Cartridge will print approximately 10,000 pages. However, a Toner Cartridge should print more pages if regularly printing pages with less coverage, such as short memos. The cartridge may print fewer pages if heavy or bold print is used.
Warranty statement This warranty gives specific legal rights. There may also be other rights which vary from area to area. See the user guide for further warranty information or see the warranty card included with the printer.
40 Chapter Product Operation C4224-90962
3 Functional Overview Chapter contents Basic functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Printer functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Engine Control Unit (ECU)/power system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Formatter system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Image formation system . . .
Basic functions This chapter presents a functional overview of the HP LaserJet 1100 Printer’s processes.
Printer functions Printer functions are divided into six groups: 1 ECU/power system 2 formatter system 3 image formation system 4 printer paper feed system 5 document scanner system 6 basic sequence of operation (formatter to printer) The following figure is a block diagram of the printer unit: To external device (host computer, etc.
Engine Control Unit (ECU)/power system The Engine Control Unit (ECU) coordinates all print engine activities, drives the laser, and coordinates print data from the formatter with the image formation process. The ECU also includes power supply and distribution circuitry.
Printer engine control system Printer laser/scanner drive Based on information received from the formatter, the ECU sends signals to the laser/ scanner assembly to modulate the laser diode “on” and “off” and to drive the laser/scanner motor. For more information, see “Image formation system” later in this chapter. Paper motion monitoring and control The ECU controls paper motion by continuously monitoring the various paper sensors and coordinating the timing with the other print processes.
Power system on ECU The AC, DC, and high-voltage power supply circuits are all contained within the ECU. AC power distribution The AC power circuitry supplies AC voltage whenever the power cord is connected to the AC power source. AC voltage is distributed to the DC power supply circuitry and to the AC driver circuitry, which controls AC voltage to the fusing assembly's heating element. DC power distribution The DC power distribution circuitry, located on the ECU, distributes +3.
This circuit also controls the image density by changing the primary AC voltage and the developing AC bias according to the print density setting. High voltage is disabled when the printer door is open.
Formatter system The formatter is responsible for the following: • controlling the optional document scanner • formatting and controlling copies • receiving and processing print data from the printer interface • monitoring the control panel and relaying printer status information • developing and coordinating data placement and timing with the print engine • communicating with the host computer through the bidirectional interface The formatter receives print data from the bidirectional Extended
Control panel • Three front panel status lights (one contained in the Go key) • Go key Draft mode Depending on which printer driver is used, selecting “draft” or EconoMode from the printer driver allows the HP LaserJet 1100 Printer to use approximately 50% less toner, extending the life of the toner cartridge. Memory Enhancement technology (MEt) The Hewlett-Packard Memory Enhancement technology (MEt) effectively doubles the standard memory through a variety of font and data compression methods.
PJL Overview Printer Job Language (PJL) is an integral part of configuration, in addition to the standard Printer Command Language (PCL). With standard ECP cabling, PJL allows the printer to perform functions such as: 50 • Two-way communication with the host computer through a bidirectional Parallel connection. The printer can tell the host such things as the control panel status. • Isolation of print environment settings from one print job to the next.
Image formation system Laser printing requires the interaction of several different technologies including electronics, optics, and electrophotographics to provide a printed page. Each process functions independently and must be coordinated with the other printer processes. Image formation consists of six processes: Figure 3-5 Image formation block diagram Toner cartridge As the heart of the image formation system, the Toner Cartridge houses the cleaning, conditioning, and developing steps of the process.
Step 2 Conditioning stage. This process consists of applying a uniform negative charge to the surface of the drum with the primary charging roller located in the Toner Cartridge. The primary charging roller is coated with conductive rubber. An AC bias is applied to the roller to erase any residual charges from any previous image. In addition, a negative DC bias is applied by the charging roller to create a uniform negative potential on the drum surface.
Printer paper feed system The paper input bin and the single-sheet input slot merge into one, main input area. Paper placed in either of these areas enables the paper-out sensor (PS001), which informs the ECU that paper is present. The following steps occur when the printer receives a print job: Step 1 The ECU enables the laser/scanner assembly and the motor. Paper motion begins when the ECU energizes the solenoid (SL001). Step 2 The paper pickup roller rotates once.
3 Paper sensor (PS001) 4 Pickup roller 5 Paper sensor (PS002) 6 Transfer roller 7 Toner cartridge 8 Pressure roller 9 Fusing unit 10 Paper exit sensor 11 Delivery rollers 12 Face-up/Face-down deflector 13 Face-down output path 14 Face-up output path Paper jam detection The paper out sensor (PS001), paper registration sensor (PS002), and the paper exit sensor (PS201) detect paper moving through the HP LaserJet 1100 Printer.
Solenoid, photosensors, and switches The following figure shows the locations of the solenoid, photosensors, and switches. Table 3-2. Solenoid, photosensors, and switches C4224-90962 1 Pickup solenoid (SL001) Enables the pickup roller. 2 Paper top sensor (SL001) Detects the leading and trailing edges of the paper. Synchronizes the photosensitive drum and the top of the paper. 3 Door open sensor (SW301) Detects whether or not the printer door is closed and the Toner Cartridge is present.
Document scanner system (optional) The document scanner system consists of the optical system and document pickup and feed systems. The optical system, also known as the contact image sensor, contains the following: • light-emitting diode (LED) array • contact glass • rod lens array • phototransistor array The LED array, which emits light from two LEDs, is controlled by the formatter. Light reflected from documents passes through the rod lens array and focuses on the phototransistor array.
Figure 3-7 Simplified scanner document path C4224-90962 1 Input path 2 Document pickup roller 3 Document sensor 4 Contact image sensor (CIS) 5 CIS roller 6 Output path Document scanner system (optional) 57
Basic sequence of operation (formatter to printer) The formatter and the ECU share information during printer operation. The ECU-to-formatter connector (J201) forms a link that operates as a serial data bus. This allows printer status, command information, and dot-image data to be passed between the two.
Figure 3-8 General timing diagram C4224-90962 Basic sequence of operation (formatter to printer) 59
60 Functional Overview C4224-90962
4 Removal and Replacement Chapter contents Removal and replacement strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Required tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 External assemblies and covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Document scanner removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal and replacement strategy This chapter documents removal and replacement of field replaceable units (FRUs) only. Replacement is generally the reverse of removal. Occasionally, notes are included to provide direction for difficult or critical replacement procedures. WARNING! Unplug the power cord from the power outlet before attempting to service the HP LaserJet 1100 Printer. If this warning is not followed, severe injury can result.
Required tools CAUTION: C4224-90962 • #1 Phillips screwdriver with magnetic tip • #2 Phillips screwdriver with magnetic tip • Small flat-blade screwdriver • Needle nose pliers • ESD mat • Pod removal tool (optional, part number BZ99-R72-8010-4) A Posidrive screwdriver will damage screw heads on the HP LaserJet 1100 Printer. Use Phillips screwdriver only.
External assemblies and covers Paper guides removal Figure 4-1 Removing the paper guides 1 64 Remove the clear plastic paper guides from the paper output trays and the scanner.
Document scanner removal Figure 4-2 Removing the optional scanner unit C4224-90962 1 Rotate the document scanner latch down and to the right to the “open” position. 2 Pull out on the bottom of the document scanner unit, then push it up slowly to clear the connector at the top of the scanner. 3 Lift the scanner off. 4 Move the scanner latch back to the “closed” position.
Document scanner opening . Figure 4-3 Opening the scanner unit NOTE: The only serviceable part inside the scanner unit is the Contact Image Sensor (CIS). 1 66 Open the scanner unit by pressing the round button on the end of the unit.
Contact image sensor removal Figure 4-4 Removing the Contact Image Sensor (continued on next page) 1 C4224-90962 Remove the black rounded cable cover by pressing down on the small catch at the top of the cover and then sliding the cover down and back.
Contact image sensor removal (continued) Figure 4-5 Removing the Contact Image Sensor (continued) NOTE: 68 2 Gently pry open the snap connectors on each end of the Contact Image Sensor with a small flat-blade screwdriver. 3 Rotate the unit up, grasp the CIS on each end, pry the end pin out of the plastic frame, and slowly lift it out. Be careful with the CIS when you lift it out; it has two springs and a small cable connected to it.
Contact image sensor removal (continued) Figure 4-6 Disconnecting the CIS wire connector 4 C4224-90962 Gently pull the connector from the slot in the metal casing.
Printer door removal Figure 4-7 Opening the printer door Prior to this step: Remove the Document Scanner. The printer door is hinged at the bottom. 70 1 Pull out on the top of the printer door. 2 The printer door will then swing open until two plastic stabilizer bars on each side of the cover are fully extended.
Printer door removal (continued) Figure 4-8 Disconnecting the stabilizer bars To disconnect the two stabilizer bars from the front cover: C4224-90962 3 Move the printer door slightly back toward the “closed” position to ease tension on the stabilizer bar connection. 4 Using a small, flat-blade screwdriver, press down on the plastic connecting snaps underneath the end of the stabilizer bar (callout 1).
Printer door removal (continued) Figure 4-9 Storing the stabilizer bars CAUTION: Stabilizer bars can break if they are not inserted back into their slots. 6 72 Slide the stabilizer bars back into their slots.
Printer door removal (continued) Figure 4-10Removing the paper deflector C4224-90962 7 Deflect the plastic spring on the left end of the deflector using a small flat-blade screwdriver. 8 Lift the paper deflector, pivoting on the right side.
Printer door removal (continued) Figure 4-11Removing the door from the hinge mechanism (continued on next page) 9 74 Remove the two screws connecting the door to the hinge mechanism.
Printer door removal (continued) Figure 4-12Removing the cover from the hinge mechanism (continued) 10 Pull firmly on the cover to slide it off of the hinge mechanism, disconnecting the plastic tabs on each side.
Pod removal Figure 4-13Removing the stabilizing pods The pods connected to the bottom of the printer must be removed before the covers of the printer can be taken off. The end of the pod removal tool marked “L” removes the left pod; the end of the tool marked “R” removes the right. To release the pods: 1 Insert the pod removal tool into the slot below the corresponding pod, and press firmly. 2 Lift the pods from the frame.
Back cover removal Figure 4-14Removing the screws on the back cover Prior to this step: Remove the memory card (if applicable) and pods. To Remove the back cover: C4224-90962 1 Remove the two screws inside the deep holes in the back cover. 2 Remove the third screw underneath the small cover over the memory door.
Back cover removal (continued) Figure 4-15Removing the back cover 78 3 Release the plastic tabs on the bottom left and right side of the printer. 4 Pull out on the bottom of the cover and lift it clear of the printer.
Internal paper guide removal Figure 4-16Removing the paper guide Prior to this step: Remove the memory card (if applicable), pods, and back cover. 1 C4224-90962 There are no screws securing the paper guide. Remove it by pulling it up and out (two small snaps will release as you pull on the paper guide).
Front cover removal Figure 4-17Removing the front cover (continued on next page) Prior to this step: Remove the pods, front door, and scanner. NOTE: 80 The hinge mechanism cannot be easily removed until the formatter is removed, due to the presence of the flat flexible cable. 1 Remove the two screws on the top of the front cover. 2 Slightly extend the stabilizer bars and close the door hinge mechanism against the printer frame.
Front cover removal (continued) Figure 4-18Removing the front cover (continued) NOTE: C4224-90962 3 Pop the plastic snaps open on the bottom left and right of the cover. 4 Pull the bottom of the cover out and lift the cover up and away from the printer. During reassembly, you must realign small tongue-in-groove tabs on the left and right side of the front cover.
Stabilizer bars removal Figure 4-19 Stabilizer bars The stabilizer bars are secured by metal plates on each end of the printer chassis. 82 1 Remove the two screws holding the metal plate at the right end of the printer chassis. 2 Remove the remaining screw holding the metal plate at the left end of the printer.
Printer laser/scanner cover removal Figure 4-20Removing the printer laser/scanner cover Prior to this step: Remove the memory card (if applicable), pods, back cover, front door, front cover, scanner, and paper guides. NOTE: 1 Remove the three screws fastening the Printer Laser/Scanner Cover. Two of the screws are shown in the photo above (callout 1). The remaining screw at the right end of the scanner cover is not shown in the above photo. 2 Disconnect the cable from the Control Panel (callout 2).
Internal assemblies Scanner assembly removal Figure 4-21Disconnecting the scanner assembly cables Prior to this step: Remove the memory card (if applicable), pods, back cover, front door, front cover, scanner, and paper guides. 84 1 Remove the small foam cover over the small cable connector. 2 Disconnect both cable connections, and remove the cable from the routing. 3 Remove the four screws holding the assembly in place, and lift it free of the printer.
Output roller removal Figure 4-22Releasing the output roller (continued on next page) NOTE: This part can be removed without disassembling any other printer parts. 1 C4224-90962 Using a small flat-blade screwdriver, release the plastic snap on the right end of the output roller.
Output roller removal (continued) Figure 4-23Releasing the output roller snaps 86 2 Slide the roller to the right, releasing it from the gear on the left. 3 Lift the roller out of the printer.
Delivery assembly removal Figure 4-24Removing the torsion screws on the delivery assembly Prior to this step: Remove the output roller. NOTE: The springs underneath the torsion screws are not attached and may come loose during removal. 1 C4224-90962 Remove the two screws in the front of the assembly.
Delivery assembly removal (continued) Figure 4-25Removing the delivery assembly 2 88 Gently slide the assembly to the right, and lift it out of the printer.
Paper exit sensor flag removal Figure 4-26Paper Exit Sensor Flag Prior to this step: Remove the output roller and delivery assembly. NOTE: Before proceeding, examine the paper exit sensor flag. It is important to note the position of the spring mechanism on the flag. The spring must be reinstalled to exactly this position, because installing it incorrectly will cause a control panel error message. 1 Remove the paper exit sensor flag by pressing down on the left side and pulling up on the right side.
Fusing element removal Figure 4-27Metal Clips Holding Fusing Element Prior to this step: Remove the scanner, pods, printer door, front cover, memory card (if applicable), output roller, and delivery assembly. NOTE: Pay special attention to the way these metal clips are attached to the printer chassis before you remove them. This will make reassembly easier. The Fusing Element is held in place on each end by two metal spring-loaded clips. Each clip has a small black lever next to it.
Fusing element removal Figure 4-28Reassembly of fusing element clips NOTE: During reassembly, make sure the metal clips are seated properly. The front of the metal clip has a small threaded hole. There is a corresponding hole on the printer chassis. Slide the front of the metal clip underneath the threaded tab on the printer chassis so that the two holes line up.
Fusing element removal (continued) Figure 4-29Releasing the fusing element cable connection, left side The Fusing Element has electronic cable connections on both the left and right ends, outside the printer. 2 92 Disconnect the small cable on the left by gently pulling the connection apart.
Fusing element removal (continued) Figure 4-30Releasing the fusing element cable connection, right side The larger double cable on the right end is held in place by a plastic snap. C4224-90962 3 Press down on the top of the plastic snap with a flat-blade screwdriver. 4 Unwind the cable from the cable guides along the side of the printer.
Fusing element removal (continued) Figure 4-31Removing the fusing element 5 94 After the two cables are disconnected from the right and left sides of the printer, lift the element gently out of the printer.
Gear train motor and solenoid removal Figure 4-32Removing the motor cable connection to the gear train cover Prior to this step: Remove the pods, memory card (if applicable), scanner, back cover, printer door, paper guides, and front cover. The Gear Train, located behind the metal plate (Gear Train Cover) on the left side of the printer, must be removed to access the Pressure Roller. 1 C4224-90962 Disconnect the motor cable connection at the back of the printer.
Gear train motor and solenoid removal (continued) Figure 4-33Removing the gear train cover 2 96 Remove the four screws securing the metal plate over the Gear Train, and very gently release it.
Gear train motor and solenoid removal (continued) Figure 4-34Removing the gear train motor NOTE: C4224-90962 Some gears are not all held in place and may come apart during removal. 3 Remove the two screws holding the Gear Motor to the Gear Plate Cover. 4 Pull the Gear Motor out of the Gear Plate Cover.
Solenoid removal Figure 4-35Removing the solenoid NOTE: 98 5 Remove the single screw securing the solenoid to the printer chassis. 6 Release the solenoid. During reassembly, rotate the clutch so that the flat spot on the clutch allows the feed roller (gear) to turn freely.
Pressure roller removal Figure 4-36 Removing the pressure roller (continued on next page) Prior to this step: Remove the scanner, pods, printer door, memory card (if applicable), paper guide, front cover, back cover, output roller, delivery assembly, fuser assembly, and gear train. C4224-90962 1 Using a flat-blade screwdriver, remove the gear from the end of the Pressure Roller by gently prying the small plastic tab up from the slot in the end of the roller axles.
Pressure roller removal (continued) Figure 4-37Removing the pressure roller CAUTION: This Pressure Roller is covered with light contact grease. Do not get it on your clothes. See Chapter 6, “Parts and diagrams,” for information about ordering pressure roller grease. NOTE: The half bushing on the right of the assembly or the full bushing on the left end of the assembly are not connected to the printer chassis and may come loose during removal.
Transfer roller removal NOTE: The Transfer Roller can be removed without disassembling any other printer parts. CAUTION: Do not touch the black portion of the Transfer Roller. NOTE: A grounding spring is attached to the bottom of the left end of the Transfer Roller. This spring may come loose during assembly or removal. C4224-90962 1 Using needle nose pliers, release the Transfer Roller by gently squeezing the small plastic snaps on the left end of the roller.
Pickup roller removal Figure 4-38Changing the pickup roller 102 1 Rotate the bottom of the pickup roller towards the front of the printer. 2 Gently pull the pickup roller straight out.
Paper pick-up assembly removal Figure 4-39Accessing the paper pick-up assembly area Prior to this step: Remove the memory card (if applicable), scanner, pods, front door, front cover, back cover, paper guide, top cover; and disconnect the laser/scanner. C4224-90962 1 Remove the screw attached to a bracket at the right end of the cover plate (callout 1). 2 Remove the two top screws attached to the right and left of the plate (callouts 2 and 3).
Paper pick-up assembly removal (continued) Figure 4-40Removing the paper pick-up assembly cover NOTE: NOTE: 104 The Pickup Assembly is in several pieces; these pieces should be kept together. Pay close attention to how the Assembly is aligned before removing it (see Reassembly Note on this page). 4 Lift the metal plate clear of the printer. 5 Remove the Paper Pickup Assembly.
Kick plate removal Figure 4-41Removing the kick plate Prior to this step: Remove the memory card (if applicable), scanner, pods, front door, front cover, back cover, paper guide, top cover; and disconnect the laser/scanner. C4224-90962 1 Rotate the cam to free the Kick Plate. 2 Rotate the Kick Plate arm up approximately 45 degrees and lift the left end up and out of the collar shaft securing it.
Separation pad removal Figure 4-42Removing the snap holding the separation pad Prior to this step: Remove the memory card (if applicable), scanner, pods, front door, front cover, back cover, paper guide, top cover, kick plate; and disconnect the laser/scanner. 1 106 Remove the plastic snap on the opposite side of the printer from the Kick Plate.
Separation pad removal (continued) Figure 4-43Removing the separation pad 2 C4224-90962 Slide the Separation Pad out through the brackets securing it.
Bottom assemblies Formatter pan removal Figure 4-44The formatter pan (continued on next page) 1 108 Remove the three screws holding the Formatter Pan to the bottom of the printer chassis. The third screw is located on a bracket at the end of the pan.
Formatter pan removal (continued) Figure 4-45Removing the formatter pan (continued) NOTE: NOTE: C4224-90962 Be careful not to damage or break the electronic cables and connections underneath the formatter pan. 2 Slowly rotate the Formatter Pan away from the chassis. 3 Unplug the small connector cable and two flat flexible cables. 4 Slide the Formatter Pan free of the metal brackets. 5 To remove the Formatter from the Formatter Pan, remove the four screws securing the Formatter.
Document scanner cable removal Figure 4-46Removing the ECU pan cable cover Prior to this step: Remove the scanner, pods, doors, back cover, front cover, and formatter. 110 1 Push down and back on the plastic cable cover on the bottom of the ECU Pan (the cable cover is marked with raised directional arrows). 2 Remove the cover, exposing the cable underneath.
Document scanner cable removal (continued) Figure 4-47Removing ECU pan flat flexible cable C4224-90962 3 Remove the screw from the cable guide. 4 Slide the flat cable and attached grounding slip out from under the holding tabs. 5 Carefully slide the cable and grounding slip out through the opening in the printer chassis.
Hinge mechanism removal Figure 4-48Removing the hinge mechanism 1 112 Slide the hinge mechanism and attached cables out of the chassis.
ECU pan removal Figure 4-49Removing the ECU pan Prior to this step: Remove the scanner, pods, doors, back cover, front cover, formatter; and disconnect the ECU cable. NOTE: C4224-90962 If the fuser cables are connected, disconnect them before removing the ECU pan. 1 Remove the two screws fastened to the brackets on the sides of the pan. 2 Remove the two screws accessed through openings in the side of the black plastic printer chassis.
ECU pan removal (continued) Figure 4-50Removing the ECU pan (continued on next page) 4 CAUTION: NOTE: 114 Slowly lift the ECU plate away from the printer chassis. Be very careful not to damage or break the connectors underneath the ECU plate as you lift it from the printer chassis. 5 Reach between the plate and the chassis and unwind the cables from their cable guides until there is enough slack in the cables to allow access to the bottom of the ECU plate.
Paper feed assembly removal Figure 4-51Removing the paper feed assembly (continued on next page) Prior to this step: Remove the scanner, pods, doors, back cover, front cover, formatter; disconnect the ECU cable; and remove the ECU pan. NOTE: C4224-90962 1 Disconnect the two cable connections. 2 Partially unwind the cables from their cable guides. 3 Remove the two screws securing the assembly to the printer chassis.
Paper feed assembly removal (continued) Figure 4-52Removing the paper feed assembly (continued) 5 116 Release the snap catches inside the gear on the left end of the Paper Feed Roller Shaft.
Paper feed assembly removal (continued) Figure 4-53Removing the paper feed assembly (continued) 6 C4224-90962 Slide the Paper Feed Roller to the right, and remove it from the printer chassis.
118 Removal and Replacement C4224-90962
5 Troubleshooting/ Maintenance Chapter contents Basic troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 Fatal errors/accessory errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 Image formation troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125 Solving image quality problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126 Cleaning procedures. . . .
Basic troubleshooting Table 5-1. Basic troubleshooting Verification steps Possible problems Solutions Is Power On successful? No power. 1. Verify that the product is plugged in. When the product is connected to a grounded power source, the printer motor should rotate for approximately six seconds and the document scanner motor should rotate for approximately two seconds. 2. Verify that the power cable is functional and that the power switch is on (220v only). 3.
Table 5-1. Basic troubleshooting Verification steps Possible problems Solutions Print an engine test, which is discussed later in this chapter. The engine test should print without paper feed problems or print quality problems. Also print self test (follow the instructions under “Printing self test” later in this chapter). Control panel displays an error light. Consult the list of common messages in Chapter 2, or “Fatal errors” in this chapter to correct the error. Self test does not print.
Fatal errors/accessory errors The printer may encounter a severe error, one that inhibits further operation. All LEDs will turn on or, in the case of an Accessory Error, all LEDs will start flashing. During this mode, pressing and holding the Go key down will reveal a pattern on the LEDs. Some LEDs might be on and some might be off, but it will be a non-changing pattern as long as the Go key is held down. This pattern can be used to identify what type of fatal error it was.
Table 5-2. Service and error messages Light status Description Recommended action Beam Error. There are a number of causes for this error, and some of the causes may disappear. 1. Power cycle the printer by unplugging the printer and plugging it back in. 2. Make certain the Laser/Scanner Assembly is correctly seated on the printer chassis. 3. Replace the Laser/Scanner cable. 4. Replace the Laser/Scanner Assembly. 5. Replace the ECU. Print Engine Error. The formatter and engine are not communicating.
Table 5-2. Service and error messages Light status Description Recommended action Incompatible DIMM Error (Accessory Error). Remove DIMM and power cycle. If error persists, replace formatter. Document Scan Engine Error. 1. Unplug the printer, remove and reattach the laser scanner, and then replug the printer. 2. Replace the document scanner unit. Document Scan Engine NVRAM Error. 1. Unplug the printer, remove and reattach the laser scanner, and then replug the printer. 2.
Image formation troubleshooting Checking the toner cartridge Image formation defects are many times the result of toner cartridge problems. If there is any doubt, always replace the toner cartridge before troubleshooting image defects. Use the following checklist to ensure that the toner cartridge is still operable. ❏ Ensure that the toner cartridge is seated properly. ❏ Inspect the toner cartridge for remaining toner. ❏ Check the expiration date stamped on the toner cartridge box.
Solving image quality problems Use the following table to help solve problems with printed pages. See “Solving paper feed problems” in this chapter. Table 5-3. Solving image quality problems Problem Cause Solution Parts of the page around the edges aren’t printing. The HP LaserJet 1100 Printer cannot print To get the image to fit into this printable to the edge of the paper. The HP LaserJet area, slightly reduce the size of the image. 1100 Printer has minimum margins on each edge of 0.25 in (6.4 mm).
Table 5-3. Solving image quality problems Problem Cause Solution Print is faded or The toner cartridge is getting low on toner. Redistribute the toner or replace the toner cartridge. you notice a block of vertically aligned white The HP LaserJet 1100 Printer needs to be See “Cleaning procedures” in this chapter. streaks, cleaned. or print is not faded, but vertical white stripes appear on the page.
Table 5-3. Solving image quality problems Problem Cause Verticallyaligned black streaks or smears appear on successive pages. The HP LaserJet 1100 Printer needs to be See “Cleaning procedures” in this chapter. cleaned. The toner cartridge is damaged. Solution Replace the toner cartridge if maintenance procedures do not improve print quality. There is a problem in the heating element. Perform the “Heating element check,” which is discussed later in this chapter.
Table 5-3. Solving image quality problems Problem Cause Solution Horizontally aligned black streaks or smears appear. The toner cartridge was improperly installed. Make sure you removed the entire length of the sealing tape from the toner cartridge before you installed it. The toner cartridge is defective. Replace the toner cartridge. The HP LaserJet 1100 Printer needs to be See “Cleaning procedures” in this chapter. cleaned. There is a problem in the heating element.
Table 5-3. Solving image quality problems Problem Cause Solution Character voids appear (white areas within the parts of characters that should be solid black). The paper or transparencies do not meet HP’s specifications. Make sure that the media meets specifications detailed in HP’s media specifications guide. You are printing on the wrong surface of the paper. Remove the paper and turn it around. (The wrapper on many reams of paper has an arrow indicating the print side.) Poor fusing.
Table 5-3. Solving image quality problems Problem Cause Solution Characters are only partially printed (also referred to as dropouts). A single sheet of paper is defective. Try reprinting the job. The print density needs to be adjusted. Adjust the print density from the control panel. The moisture content of the paper is Make sure that the media meets inconsistent or the paper has moist or wet specifications detailed in HP’s media spots on the surface. specifications guide.
Table 5-3. Solving image quality problems Problem Cause Blank pages are The toner cartridge was improperly always printing. installed. Solution Make sure you removed the entire length of the sealing tape from the toner cartridge before you installed it. The toner cartridge is completely out of toner. Replace the toner cartridge. Discontinuity exists in the high-voltage contact points. Perform the “High-voltage power supply check,” which is discussed later in this chapter.
Table 5-3. Solving image quality problems C4224-90962 Problem Cause Solution Scanned text is not clear. The contrast, resolution, or brightness needs to be adjusted before scanning. Adjust the resolution, contrast and/or brightness setting(s) from the tool box on the Document Assistant. The original is on colored paper. If the original was on colored paper, including brown recycled paper, the text may not be clear.
Solving paper feed problems Use the following table to solve problems related to moving paper or documents through the HP LaserJet 1100 Printer. Table 5-4. Solving paper feed problems Problem Cause Paper is curled or wrinkled when using the Pages are paper output bin. coming out curled or wrinkled from Paper is not stored properly. the HP LaserJet 1100 Printer. Long pages stop The document feeder tray guides are not feeding through set correctly, are broken, or are missing. the document scanner.
Table 5-4. Solving paper feed problems Problem Cause The HP LaserJet Paper guides are not adjusted properly. 1100 Printer is feeding multiple sheets or jams frequently from the paper input bin or singlePaper was not removed from the paper sheet input slot. input bin before filling the bin. Solution Slide the guides against the sides of the stack in the paper input bin or against the single sheet in the single-sheet input slot to center the paper. Make sure the guides are not adjusted too tightly.
Table 5-4. Solving paper feed problems Problem Cause The HP LaserJet Guides are not adjusted properly. 1100 Printer is feeding multiple sheets or jams frequently from the document feeder tray. The document feeder tray is overfilled. Items loaded in the document feeder tray fall forward out of the tray. 136 Troubleshooting/Maintenance Solution Remove the document from the document feeder tray. Straighten the item, then reinsert it. Slide the guides against the sides of the item to center it.
Cleaning procedures Cleaning the toner cartridge area With a dry, lint-free cloth, wipe any residue from the paper path area and the toner cartridge cavity. NOTE: Cleaning the toner cartridge area is not necessary on a regular basis. Before cleaning, look for excessive toner in the compartment. Cleaning the printer paper path This process uses copier-grade paper to remove dust and toner from the paper path. Do not use bond or rough paper.
WARNING! Alcohol is flammable. Keep the alcohol and cloth away from open flame. Allow alcohol to dry completely before closing the printer and plugging in the power cord. 3 Using a dry, lint-free cloth, wipe the pickup roller to remove loosened dirt. 4 Allow the pickup roller to completely dry before reinstalling it in the printer. Cleaning the scanner You may need to clean the scanner after scanning or copying items that have ink which smudges or that have excessive amounts of dirt or dust.
3 WARNING! Alcohol is flammable. Keep the alcohol and cloth away from open flame. Allow alcohol to dry completely before plugging in the power cord. 4 WARNING! C4224-90962 Dampen a clean, cotton cloth with rubbing alcohol (pH7 or neutral pH) or glass cleaner. Gently rub back and forth on the white CIS roller with the damp cloth while slowly turning the CIS roller. Spray glass cleaner on another piece of clean, cotton cloth and carefully clean the glass on the image sensor.
Functional checks Engine test The engine test is used to verify that the print engine is functioning correctly. The formatter is bypassed during an engine test, so the engine test is useful for isolating printer problems. The engine test prints vertical lines down the entire printable area of a page and is also useful for checking and adjusting registration. Engine test button location The engine test switch is accessible without removing the covers.
Self test page The Self Test Page (Figure 5-2) printout provides both a means of testing the printer and a way of displaying the printer's configuration. The Self Test Page Printout does not run a diagnostic Self Test (unlike previous printers) but it still tests the functionality of the printer by being able to format data and place it accurately on the page. To print a Self Test Page, press the Go key when the printer is in a ready state.
If the memory is too low, a reduced Self Test Page is printed which contains only the printer configurations and a message “Reduced Self Test Printed - Memory Too Low.” In a lowmemory condition the font printout attempts to print all downloaded permanent fonts, but if the memory is too low a message “Font Test Aborted” is printed. In some low-memory situations a reduced Self Test Page may be printed, but the font printout may have enough memory to print all downloaded permanent fonts.
Drum rotation functional check The photosensitive drum, located in the toner cartridge, must rotate for the print process to work. The photosensitive drum receives its drive from the main drive assembly. To verify that the drum is rotating: 1 Open the printer door. 2 Remove the toner cartridge. 3 Mark the drive gear on the cartridge with a felt-tipped marker. Note the position of the mark. 4 Install the toner cartridge and close the printer door.
Figure 5-3 Thermistor Connector 3 Remove the heating element connector (Figure 5-4) from the ECU. To measure the continuity of the heating element, measure the resistance between the two pins at the end of the cable. Figure 5-4 Heating Element Connector NOTE: Normal resistance is 30 ohms +/- 10 ohms. 4 144 If no resistance is measured, replace the heating element.
5 NOTE: Normal resistance is 440K ohms +/- 30K ohms at 68° F (20° C). 6 C4224-90962 Remove the thermistor connector (Figure 5-3) and measure the resistance between pins one and two. If no resistance is measured, replace the heating element.
High-voltage power supply check The high-voltage power supply PCA provides the necessary voltages for the electrophotographic processes. Checking the toner cartridge connection points Visually inspect the three connection points on the underside, right end of the toner cartridge: charging (callout 1), drum ground (callout 2), and developing roller (callout 3). If they are dirty or corroded, clean the connections, or, if they are damaged, replace the toner cartridge.
Figure 5-6 High-voltage connector assembly Paper curl Paper curl is inherent to the laser printing processes, and occurs when paper is subjected to heat. Paper curl tends to relax as the paper cools while resting on a flat surface. The specification for maximum paper curl when the paper is lying flat before print is 0.2 inches (5 mm). Paper path check If paper is not being picked up or is not moving through the paper path, you may want to observe all of the paper motion activities.
To override SW301 Figure 5-7 Overriding SW301 148 1 Remove the printer covers 2 Install the toner cartridge. 3 Make sure the fuser levers on the Delivery Assembly are closed. 4 Press SW301- front door interlock (callout 1). 5 Press Laser/Scanner Interlock Switch on Laser/Scanner (callout 2) 6 While SW301and Laser/Scanner Interlock is engaged, perform an Engine Test to observe paper motion. (See procedures earlier in this chapter.
ServiceMode functions (PJL Software Commands) To set the following NVRAM variables: Factory printer DEFAULT PAPER, scanner factory default paper size will be set to the same value automatically if one is attached. Factory printer DEFAULT LPARM:PCL SYMSET. Factory DEFAULT OEM bit. Factory DEFAULT PRINTPAGECOUNT. Factory DEFAULT SCANPAGECOUNT if scanner is attached. Factory DEFAULT COPYPAGECOUNT if scanner is attached.
084#/ 2,. 8CTKCDNG QT %QOOCPF DEFAULT PAPER 2QUUKDNG UGVVKPIU "LETTER", "LEGAL, "A4", "EXECUTIVE”, "COM10”, "MONARCH”, "DL”, "C5”, "B5", "CUSTOM" DEFAULT LPARM :PCL SYM SET 41/#0 +51. +51. +51. 2% 2% &0 2% 2% 2% 6- 9+0. 9+0. 9+0. &'5-612 256':6 80+06. 8075 /527$. /#6* 25/#6* 80/#6* 2+(106 .')#.
NOTE: Remember to set SERVICEMODE before trying to set the variable or you will not get the desired result. The PJL reset is also necessary to be sure the SERVICEMODE status is cleared. To create these files you will need an editor that can insert the ESC character, or be able to copy it in from a existing file. If a software tool is used, just send down the same strings, in the same order as given for the example files.
Troubleshooting tools Printer paper path Figure 5-9 Paper path and components 152 Troubleshooting/Maintenance C4224-90962
Document paper path Figure 5-10 C4224-90962 Document path and components Troubleshooting tools 153
Repetitive image defect ruler First occurrence of print defect Developing cylinder 32 mm (1.25 in) Primary charging roller 38 mm (1.5 in) Delivery roller 37.7 mm (1.48 in) Transfer roller 45 mm (1.8 in) Pressure roller 62.8 mm (2.5 in) Upper heating element film 76 mm (3.
Main wiring II.
156 Troubleshooting/Maintenance C4224-90962
6 Parts and diagrams Chapter contents How to use the parts lists and diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parts and supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Consumables and accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to use the parts lists and diagrams The figures in this chapter illustrate the major subassemblies in the printer and their component parts. A table (material list) follows each exploded assembly diagram. Each table lists the reference designator, the associated part number for the item, and a description of the part. While looking for a part number, pay careful attention to the voltage listed in the description column to make sure that the part number selected is for the correct model of printer.
Parts and supplies Ordering parts Replacement parts may be ordered from HP’s Support Materials Organization (SMO) or Support Materials Europe (SME). Use only accessories specifically designed for this printer. Accessories can be ordered from an authorized service or support provider. All standard part numbers listed are stocked and may be ordered from HP’s Support Materials Organization (SMO), or Support Materials, Europe (SME). • Hewlett-Packard Co. Support Materials Organization 8050 Foothills Blvd.
Consumables and accessories The following items are available through a local authorized HP dealer. To find a dealer near you (or if your dealer is temporarily out of stock), call the HP Customer Information Center at (800) 752-0900. DESCRIPTION PART # EST. LIFE (PAGES) REMARKS Toner cartridge (user replaceable) C4092A 2,500 When print becomes faint, redistribute toner in the cartridge.
Ordering consumables The consumables and accessories listed in the above table may be ordered from HewlettPackard. The phone numbers are: • U.S.: (800) 538-8787 • Canada: (800) 387-3154 (Toronto: (516) 671-8383) • United Kingdom: 0734-441212 • Germany: 0130-3322 • SMO (Support Material Organization) (800) 227-8164 (U.S. only) • SME (Support Materials Europe) (49 7031) 142253 Contact a local HP Parts Coordinator for other local phone numbers.
Common hardware Table 6-1.
External covers and panels Figure 6-1 External covers, panels, etc. Table 6-2. External covers, panels, ets.
Document scanner parts Figure 6-2 Document Scanner Table 6-3.
Internal components Figure 6-3 Internal components, 1 of 4 Table 6-4.
Figure 6-4 Internal components, 2 of 4 166 Parts and diagrams C4224-90962
Table 6-5.
Figure 6-5 Internal components, 3 of 4 168 Parts and diagrams C4224-90962
Table 6-6.
Figure 6-6 Internal components, 4 of 4 170 Parts and diagrams C4224-90962
Table 6-7.
Feeder assembly Figure 6-7 Feeder assembly 172 Parts and diagrams C4224-90962
Table 6-8.
Engine controller assembly Figure 6-8 Engine controller assembly 174 Parts and diagrams C4224-90962
Table 6-9.
Formatter pan Figure 6-9 Formatter pan Table 6-10.
Parts list sorted by part number Table 6-11.
Table 6-11.
Table 6-11.
Parts list sorted by part name Table 6-12.
Table 6-12.
Table 6-12.
List of Figures Control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 Printer light patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 Scanner control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31 Basic configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42 Printer unit functional block diagram . . . . . . . . . . . . . . . . . . . . . .43 ECU loads . . . . . . . . . . . . . .
Removing the kick plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 Removing the snap holding the separation pad . . . . . . . . . . . . . 106 Removing the separation pad . . . . . . . . . . . . . . . . . . . . . . . . . . 107 The formatter pan (continued on next page) . . . . . . . . . . . . . . . 108 Removing the formatter pan (continued) . . . . . . . . . . . . . . . . . . 109 Removing the ECU pan cable cover . . . . . . . . . . . . . . . . . . . . .
List of Tables Printer specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 Control panel light messages . . . . . . . . . . . . . . . . . . . . . . . . . . .27 Printer key functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29 Scanner key functionality based on printer status . . . . . . . . . . . .32 DC power distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46 Solenoid, photosensors, and switches . . . . . . . . . . .
186 C4224-90962
Index A AC power distribution 46 accessories and consumables ordering 161 adjusting registration 140 assemblies fusing 53 high-voltage connector 147 assembly diagrams 158 B bidirectional ECP interface 48 black dots on pages 127 dots on scanned images 132 pages 130 streaks on page 128 blank areas on page 130 bottom of page or graphic 131 pages 131 bottom of page or graphic cut off 131 C cartridge sensor (SW101) 55 characters partially printed 131 charging the drum 52 checking registration 140 checks drum r
high-voltage power supply 146 circuit driver 56 circuitry high-voltage 47 power 46 cleaning photosensitive drum process 51 printer 137 printer paper path 137 toner cartridge connection points 146 components, internal illustrations 165, 168, 172, 174, 176 connection points for toner cartridge 146 conserving toner 49 consumables and accessories ordering 161 contact image sensor 56 control panel description 49 control, paper motion 45 crooked pages 134 curled pages 134 paper 147 customer support ordering parts
toner cartridge expiration 125 DC power distribution 46 delivery roller motion 147 developing process 52 diagrams assembly 158 timing 59 distribution of power 46 document sensor (PS801) 55 documents fall out of feeder tray 136 door open sensor (SW101) 55 dots on pages 127 on scanned images 132 draft mode 49 DRAM (dynamic random-access memory) 48 driver circuits 56 roller motion 147 dropouts in characters 131 drum rotation functional check 143 drum, photosensitive charging 52 cleaning process 51 troubleshoot
electrophotographic process 142 engine control function 43 engine test 140 engine test switch (SW201) 55 error messages printer light patterns 11, 26 ESD (electrostatic discharge) caution 62 mat 63 exit rollers 53 expiration date of toner cartridges 125 F faded print 127 fasteners, common 162 faxes light or dark 126 feed assembly drive rollers 53 feed functions 43 feeding problems 135, 136 fixing process 52 formatter 48 functional checks drum rotation 143 fuser gear motion 147 roller motion 147 fuses 46 fu
H half-self test 142 hardware common 162 high-voltage connector assembly 147 power distribution 46 power supply check 146 I image fixing process 52 image formation function 43 system 51 troubleshooting 125 images lines on page 128 too light or dark 126 installing self-tapping screws 62 K kick plate motion 53, 147 L LED (light-emitting diode) array 56 light faxes 126 printing 127 scanned images 126 light patterns printer 11, 26 light-emitting diode (LED) array 56 lines on scanned images 128 C4224-90962
M memory DRAM (dynamic random-access memory) 48 RAM (random-access memory) 48 misaligned print 132 missing bottom of page or graphic 131 mode, draft 49 monitoring paper motion 45 motion control 45 motor description 45 rotation 147 multiple pages feeding 135, 136 O optical system 56 ordering accessories and consumables 161 overcurrent 46 overview of processes 42 overvoltage 46 P pads separation 53 sub 53 page engine test 140 pages blank print 131 bottom cut off 131 completely black 130 crooked 134 curled o
skewed 132, 134 paper curl 147 feed problems 134 motion 53 not being picked up 147 not moving through path 147 not printing to edge 126 paper exit sensor (PS201) 53, 54, 55 paper jams 135, 136 paper motion control 45 paper out sensor (PS202) 54, 55 paper path check 147 paper registration sensor (PS203) 53, 54, 55 partially printed characters 131 parts lists 158 path scanner 56 path, paper check 147 photosensitive drum charging 52 cleaning process 51 troubleshooting 125 phototransistor array 56 pickup roller
AC distribution 46 DC distribution 46 high-voltage distribution 46 shutoff switch 45 supply check 146 system description 44, 46 primary charging 52 print misaligned 134 skewed 134 print engine control system 45 printer functions 43 isolating problems 140 laser/scanner functions 43 light patterns 11, 26 specifications 13– 14 printing engine test page 140 faded 127 misaligned 132 to edge of paper 126 won’t print 126 product block diagram 43 overview of processes 42 protection, overcurrent 46 R RAM (random-ac
exit 53 feed assembly drive 53 motion 147 rotation, drum 143 S scan process 142 scanned images lines on page 128 too light or dark 126 scanned text unclear 133 scanner path 56 system 56 scattered toner on page 130 screwdrivers required for servicing 63 screws common 162 installing 62 self-tapping 62 self-tapping screws, installing 62 sensors contact image 56 document 55 door open 55 location and function 55 paper exit 55 paper exit (PS201) 53, 54 paper out (PS202) 54, 55 paper registration (PS203) 53, 54,
service and support ordering parts 159 Support Materials Europe (SME) 159 Support Materials Organization (SMO) 159 shutoff switch 45 skewed pages 134 print 132 smears on page 128 smudges on page 127 solenoid 55 solenoid assembly 147 specifications printer 13– 14 stains on page 127 streaks on pages 128 on scanned images 132 stripes on page, white 127 subassembly diagrams 158 subpads description 53 summary of processes 42 support and service ordering parts 159 Support Materials Europe (SME) 159 switches engin
tests engine 140 half-self 142 text, scanned, unclear 133 timing diagram 59 toner draft mode for conserving 49 scattered on page 130 toner cartridge 38 recycling 38 refilled 38 toner cartridges checking 125 checking and cleaning connection points 146 description 51 expiration date 125 photosensitive drum 125 sensor 55 weight when full and empty 125 tools servicing 63 troubleshooting 147 transfer process 142 transfer roller motion 147 trays documents fall out 136 troubleshooting drum rotation 143 image forma
tools 147 V video controller 56 void areas on page 130 voltage distribution 46 high 46 over 46 power supply check 146 protection 46 W warranty statement 39 weight toner cartridge when full and empty 125 white areas on page 130 stripes on page 127 wrinkled pages 134 198 C4224-90962
HP HP LaserJet 1100A Service Manual Copyright© 1998 Hewlett-Packard Co. Printed in USA Manual Part No.
