K Service Source LaserWriter 16/600 PS LaserWriter 16/600 PS
K Service Source Basics LaserWriter 16/600 PS
Basics Read Me First - 1 Read Me First The LaserWriter 16/600 PS has the same form factor as the LaserWriter Pro 600/630, though some functions and parts are entirely different. If you want a detailed description of the new servicing issues presented by this printer, go to the document “New Servicing Issues” that is included on this CD. Below is a brief outline of this document.
Basics Read Me First - 2 Faster engine – Modules not backward-compatible – Feeders not backward-compatible – Two new fans for ventilation – Slightly louder (52 dB vs.
Basics Printer Utilities - 3 Printer Utilities The printer utility that you use depends on the type of computer you use. This topic briefly describes the various utilities. Refer to chapters 3 and 4 of the user’s guide for complete information Note: Settings made with any of these printer utilities become default parameters and affect all printed documents, regardless of the computer that originated the print request.
Basics Printer Utilities - 4 Apple Printer Utility for Macintosh Computers The Apple Printer Utility for Macintosh computers works only with the LaserWriter 16/600 PS. You use this utility to set parameters that reside on the printer’s I/O controller board. You can use this utility to perform many functions, some of which are listed below.
Basics Printer Utilities - 5 does not work with the LaserWriter 16/600 PS. The Apple Printer Utility has a hierarchical interface that is completely different than the LaserWriter Utility for the Macintosh that serves other laser printers. After you launch the Apple Printer Utility and select a printer, a window opens that shows four headings. These headings are like folders in the Finder. If you click an arrow, the folder expands to show more items.
Basics Printer Utilities - 6 LaserWriter Utility for Windows The LaserWriter Utility for Windows has the same functions as the Apple Printer Utility for Macintosh computers, except for certain hard drive and font functions which are absent from the Windows printer drive interface. NetWare Utilities There are two DOS utilities, LWPMAN and LWFORM, that perform a subset of Apple Printer Utility functions in a NetWare environment.
Basics Paper Path - 7 Paper Path * Optional Envelope Feeder (75) Multipurpose Tray (100) Standard Cassette (250) Optional Sheet Feeder (500) There are four paper sources and one output tray in a complete system. The number in parenthesis is the capacity of the paper source. Note: The asterisk at the point where the paper paths meet denotes a synchronization pause. See PS602 in “Sensing System Theory” in this chapter.
Basics Mechanical Drive Theory - 8 M4 M1 M2 M3 Mechanical Drive Theory There are four motors and four separate drive trains in a complete system. Two are in the printer engine and one is in each of the optional feeders.
Basics Mechanical Drive Theory - 9 M1 Main Motor Drive Power Supply DC Controller Board A The main motor powers the system that transports paper from the toner cartridge to the delivery tray on top of the printer. Connecting Cable Main Motor Drive Assembly B C Toner Cartridge D Fuser Assembly Gears/Rollers F Transfer Roller E Delivery Roller Assy Gears/Belt/Rollers G Note: The letters next to the boxes correspond to the labels in the mechanical drive animations that are available on the CD.
Basics Power Supply Mechanical Drive Theory - 10 DC Controller Board A Connecting Cable Pickup Controller Board Pickup Sensor Board Pickup Block Motor Pickup Solenoids Gear/Roller System H J K M2 Pickup Block Motor Drive The pickup block motor powers the system that transports paper into the engine, through the pickup block, and up to the toner cartridge. Note: The DC controller board does not connect directly to the pickup block motor.
Basics Power Supply Mechanical Drive Theory - 11 DC Controller Board A Connecting Cable Pickup Controller Board ENGINE SHEET FEEDER Connecting Cable Controller Block L Feeder Controller Board M Sheet Feeder Motor Pickup Solenoid H Gear/Roller System N M3 Sheet Feeder Motor Drive The sheet feeder motor powers the system that transports paper from the 500-sheet cassette upward into the printer engine.
Basics Power Supply Mechanical Drive Theory - 12 DC Controller Board A Connecting Cable ENGINE ENV FEEDER Pickup Controller Board H Connecting Cable O Connecting Cable Feeder Controller Board Envelope Feeder Motor Pickup Rollers Drive Assembly Primary Feed Roller Separation Drive Assy P Q M4 Envelope Feeder Motor Drive The envelope feeder motor powers the system that separates envelopes and feeds them into the printer engine.
Basics Sensing System Theory - 13 Sensing System Theory There are six paper sensors, one dual-purpose sensor, and seven sensing switches in a LaserWriter 16/600 PS system: Paper Sensors – PS601: Cassette Paper Sensor – PS602: Registration Paper Sensor – PS701: Multipurpose Paper-End Sensor – PS702: Multipurpose Paper-Present Sensor – PS851: Sheet Feeder Paper-Present Sensor – PS931: Envelope Paper-Present Sensor – PS201: Delivery/Interlock Sensor Sensing Switches – SW601: Top Cover Interlock Switch – SW60
Basics Sensing System Theory - 14 – – – – – •SW604: •SW605: •SW851: •SW852: •SW853: Upper Cassette Size Upper Cassette Size Lower Cassette Size Lower Cassette Size Lower Cassette Size Sensing Sensing Sensing Sensing Sensing Switch Switch Switch Switch Switch
Basics Sensing System Theory - 15 Actuator Photointerrupter OPEN CLOSED Paper Sensors Paper sensors consist of an actuator, a U-shaped photo interrupter, and circuitry. Sensors are tripped as the actuator swings against movement of paper and blocks the gap of the U. An actuator can be passive (governed by gravity) or spring-loaded. Note: Sensor failure can be either mechanical or electrical.
Basics Sensing System Theory - 16 or lever moves freely without snagging, that any springs are applying correct resistance, and that the actuator is not broken. Then check that all cable connections are secure. If you have eliminated mechanical issues, proceed with electrical troubleshooting.
Basics Sensing System Theory - 17 PS601 Cassette Paper Sensor Sensor Holder Assembly PS601 Paper Pickup Block Actuator: A passive lever in the sensor holder assembly is tripped by insertion of a loaded cassette tray.
Basics Sensing System Theory - 18 PS602 Registration Paper Sensor Sensor Holder Assembly PS602 Paper Pickup Block Actuator: A spring-loaded lever in the sensor holder assembly is tripped by arriving paper. All paper stops at PS602 and waits for proper synchronization with drum rotation and mechanical drive.
Basics Sensing System Theory - 19 pickup unit delay jam exists and the controller stops printing. If paper reaches the sensor but does not clear it within the correct time, a pickup unit stationary jam exists. The time allowed for paper to clear is a function of paper size, which is detected by PS701 (for manually fed paper) and by sensing switches (for cassette-fed paper).
Basics Sensing System Theory - 20 PS702 Multipurpose PaperPresent Sensor Pickup Sensor Board PS702 Paper Pickup Block Actuator: A spring-loaded lever in the paper pickup block is tripped by the leading edge of paper as it is loaded in the multipurpose tray.
Basics Sensing System Theory - 21 PS701 Multipurpose Paper-End Sensor Pickup Sensor Board PS701 Paper Pickup Block Actuator: A passive lever in the paper pickup block is tripped by the trailing edge of paper leaving the multipurpose tray. Sensor PS701 detects the size of paper fed from the multipurpose tray.
Basics Sensing System Theory - 22 PS201 Delivery/Interlock Sensor Delivery/Interlock Sensor Actuator: A plastic tab on the fuser door and a sensing lever in the fuser assembly act independently to trip a photo interrupter. PS201 detects two things: paper exiting the fuser and closure of the fuser door. Note: If paper does not reach sensor PS201 within 5.
Basics Sensing System Theory - 23 exists and the controller stops printing. If paper reaches the sensor but does not clear it within the correct time, a delivery unit stationary jam exists. The time allowed for paper to clear is a function of paper size, which is detected by PS701 (for manually fed paper) and by sensing switches (for cassette-fed paper).
Basics Sensing System Theory - 24 PS851 Sheet Feeder PaperPresent Sensor Actuator: A passive lever in the controller block is tripped by insertion of a loaded cassette tray.
Basics Sensing System Theory - 25 PS931 Envelope Feeder PaperPresent Sensor Actuator: A spring-loaded lever is tripped by placement of envelopes into the feeder.
Basics Sensing System Theory - 26 Circuit Board Leaf Spring Microswitch Actuator Microswitch ON Microswitch OFF Sensing Switches Sensing switches attach to a circuit board and do not use photo interrupters. Switches are actuated by leaf springs that press inward as you insert a cassette tray or close the top cover. Failure in sensing switches can be either mechanical or electrical.
Basics Sensing System Theory - 27 misshapen. You should be able to press the leaf spring with your finger and hear the clicking of the microswitch. If you have eliminated mechanical issues, proceed with electrical troubleshooting.
Basics Sensing System Theory - 28 SW601 Top Cover Interlock Switch Actuator: A tab on the top cover actuates a leaf spring and pin, which press the microswitch on the pickup controller board. See “Troubleshooting Tips” in Troubleshooting for information on defeating the top cover interlock switch.
Basics Cassette (None) Legal Letter A4 Executive B5 Sensing System Theory - 29 SW603 SW604 OFF OFF ON OFF OFF ON ON OFF OFF SW605 SW603/4/5 OFF ON OFF OFF ON ON OFF ON ON Paper Pickup Block Cassette Size Sensing Switches (Upper) Pickup Controller Board SW603 SW604 SW605 Actuator: Plastic tabs on the side of the cassette trays actuate leaf springs, which press microswitches on the pickup controller board. The tab/switch configurations are as shown.
Basics Sensing System Theory - 30 SW851/2/3 Cassette Size Sensing Switches (Lower) Sheet Feeder Controller Board SW851 SW852 SW853 Actuator: Plastic tabs on the side of a cassette tray actuate leaf springs, which press microswitches on the sheet feeder controller board. Note: The sheet feeder uses a 500-sheet universal cassette. As with the upper 250-sheet universal cassette, the tabs are set manually by adjusting a selection dial on the cassette.
Basics Sensing System Theory - 31 When you are troubleshooting, be aware that human error can be a factor in paper-size sensing for these universal cassettes.
Basics Test/Configuration Pages - 32 Test/Configuration Pages There are three special pages that an operational LaserWriter 16/600 PS can print. Each indicates information that can isolate problems and/or identify the configuration of the printer. Startup Test Page The printer generates a startup test page 2-3 minutes after you switch on the printer. Successful printing of this page indicates that the I/O board is operational.
Basics Test/Configuration Pages - 33 Service Test Page The printer generates a service test page when you press the service test page button. Successful printing of this page indicates that the printer engine is operational. Configuration Page The printer generates a configuration page when you issue the “Print Configuration Page” command with the printer utility. Note: The “Print Configuration Page” command in the Apple Printer Utility is located in the File menu.
Basics Test/Configuration Pages - 34 Ê Startup Test Page Printer Names Communication parameters and printer control language selected for an individual printer port ROM version Installed RAM Printer Resolution Number of pages the I/O board has produced Other startup icons FinePrint enabled PhotoGrade enabled Hard drive on-line Optional feeders installed
Basics Test/Configuration Pages - 35 Service Test Page To access the service test page button, open the multipurpose tray. The button is located in the upper right corner of the opening. The button is small and difficult to see against the black plastic. Use a paper clip or similar tool to press the button.
Basics Test/Configuration Pages - 36 The service test page pattern is a series of vertical lines that cover the imageable area of the page.
Basics Test/Configuration Pages - 37 Configuration Page This page provides the following information to the service technician.
Basics Test/Configuration Pages - 38 • • • • • Halftone screen settings (7) System administrator password (8) Timeout settings (9) SCSI ID of printer and attached drives (10) Default paper tray and margin offsets (11) If possible, always print a configuration page before calling Apple Technical Assistance Center.
Basics Configuration Switch - 39 Configuration Switch Configuration Switch Communication Ports The configuration switch is located at the top of the I/O controller board end bracket. Configuration refers to the communication protocols that you assign to each of the three ports. When you set communication protocols on older LaserWriter printers, you typically set a configuration switch that has numerical settings similar to a SCSI ID switch.
Basics Configuration Switch - 40 choose corresponds to one of ten codes in a predefined configuration matrix. With the LaserWriter 16/600 PS, the configuration switch is a toggle between standard (down) and custom (up) values. You define custom settings through software (see “Printer Utilities” in Basics). This scheme allows users greater flexibility in establishing configuration.
Basics LaserWriter Safety - 41 LaserWriter Safety Unplug Printer LaserWriter printers operate at high voltages. To prevent serious injury, always switch off the printer and unplug the AC power cord before servicing the printer. Laser Beam Safety Never disconnect the beam-detect cabling or laser shutter when the printer is switched on. Also be careful not to place screwdrivers or other shiny objects in the path of the laser beam. The reflected laser beam, though invisible, can permanently damage your eyes.
Basics LaserWriter Safety - 42 Fuser Heat The fuser assembly rollers become very hot during printer operation. Before servicing the fuser assembly, switch off the printer for at least 5 minutes to allow the fuser assembly roller to cool. Toner Safety Toner is a nontoxic substance composed of plastic, iron, and a small amount of pigment. Clean skin and clothing by removing as much toner as possible with a dry tissue, then washing with cold water.
K Service Source Specifications LaserWriter 16/600 PS
Specifications Engine - 1 Engine Engine Canon LBP-P430 engine Printing Method Electrophotography using single-component microfine toner Optical System Semiconductor laser and a rotating six-faced prism scanning mirror Resolution 600 dpi
Specifications Dimensions Engine - 2 Height: 12.08 in. (307 mm) Width: 16.73 in. (425 mm) Depth: 16.89 in. (429 mm) Clearance Required 50.4” x 24.25” x 19.75” high (1282 x 616 x 501 mm) Weight Printer with cassette: 42.02 lb. (19.1 kg): Toner cartridge: 3.3 lb. (1.5 kg) Operating Environment Temperature: 50-90.5° F (10-32.
Specifications Power Consumption Noise Level Engine - 3 Approximately 0.79 kW at 71° F (20° C) Sound Power Level: 66 dB or less (printing) 47 dB or less (standby) Sound Pressure Level (Bystander Position) 52 dB or less (printing) 34 dB or less (standby) Printing Speed 17.1 pages per minute (letter) 16.
Specifications Consumables Service Life Macintosh Requirement Engine - 4 Pickup Rollers: 200,000 pages Separation Pad: 200,000 pages Fuser Assembly: 200,000 pages Transfer Roller: 200,000 pages Power Supply Fan: 25,000 hours Controller Board Fan 25,000 hours Front Fan 10,000 hours Replace the multipurpose pickup roller and separation pad together. The separation pad is contained in the multipurpose tray guide assembly. System Software 7.
Specifications Printable Area (in inches) Engine - 5 US Letter: 8.11 by 10.79 US Legal: 8.11 by 13.79 A4: 7.89 by 11.44 B5: 6.72 by 9.
Specifications I/O Board - 6 I/O Board CPU AMD 29030 (RISC) running at 25 MHz RAM 8 MB, expandable to 32 MB. Refer to “Upgrading RAM” in Upgrades for more information. ROM 4 MB standard ROM may be either soldered or in the form of SIMMs. If you are returning an I/O controller board to Apple that uses ROM SIMMs, those SIMMs must accompany the board. Replacement I/O controller boards that do not have soldered ROM will have separately-bagged ROM SIMMs that you will need to install onto the board.
Specifications Pinouts Settings Imaging Languages Supported I/O Board - 7 LocalTalk, Ethernet, and parallel connections The LaserWriter 16/600 PS features automatic traffic control. The printer can accept jobs simultaneously from AppleTalk, TCP/IP, and NetWare networks and from the parallel port, automatically switching between PostScript and PCL5 languages. No manual intervention is required if the standard communication settings are adequate.
Specifications Fax Card - 8 Fax Card Features When equipped with the fax card, the LaserWriter 16/600 PS • Sends documents to any Group III-compatible fax machine or printer from an Apple Macintosh or IBM PC compatible computer. • Receives and prints faxes at 200dpi from Group III-compatible fax machines. • Receives and prints faxes at 600dpi from other printers equipped with PostScript fax capability.
Specifications Fax Card - 9 card has built-in modem capability and can be connected directly to an analog phone line. The international fax card is designed to connect into an external modem.
Specifications Sheet Feeder - 10 Sheet Feeder Dimensions Height: 5.28 in. (134 mm) Width: 16.38 in. (416 mm) Depth: 18.15 in. (461 mm) Weight 13.2 lb. (6.
Specifications Envelope Feeder - 11 Envelope Feeder Dimensions Height: 5.03 in. (127.8 mm) Width: 12.04 in. (306.5 mm) Depth: 11.53 in. (293 mm) Weight 5.72 lb. (2.
Specifications Paper - 12 Paper Input Sources and Capacities Output Source Paper Sizes Standard cassette (250) Multipurpose tray (100) Lower cassette (500) Envelope feeder (75) Face-down delivery tray Standard Cassette: A4, B5, legal, letter, or executive plain paper (16-24 lb.) Cassettes available: letter, A4, or universal Multipurpose Tray Plain paper from 7.16 in. by 10.1 in. to 8.5 in. by 14 in. (1632 lb.
Specifications Paper - 13 Lower Cassette A4, B5, legal, letter, or executive plain paper (16-24 lb.) Cassette available: universal Envelope Feeder COM-10, DC, Monarch, C5, B5 (recommended envelope); from 3.54 in. by 7.44 in. to 7.0 in. by 10.0 in. Note: Do not use envelopes with clasps, snaps, windows, or synthetic materials. Envelopes with peel-off adhesive strips or double sealable flaps must use fuser-compatible adhesive.
K Service Source Troubleshooting LaserWriter 16/600 PS
Troubleshooting General - 1 General Troubleshooting contains quick-reference troubleshooting information for the LaserWriter 16/600 PS. We encourage you to review and print out this chapter before troubleshooting a printer. At the end of this chapter are troubleshooting flowcharts and tables. If a table name clearly addresses your problem, you can go directly to that table. If not, you should go to the flowchart associated with the version of the printer you are working on.
Troubleshooting Power–On Self Test (POST) - 2 Power–On Self Test (POST) When you switch on power, the LEDs are designed to illuminate in a specific sequence as the printer comes ready. In a functioning printer, all LEDs briefly illuminate about a second after you turn on the printer to confirm power distribution . They then extinguish and pulse as the fans power up and main motor rotation takes place. About 5-6 seconds into printer startup, all LEDs will again illuminate for one second.
Troubleshooting Power–On Self Test (POST) - 3 Note: The LED array that POST uses has no correlation to jam, low-toner, or paper-out conditions. POST simply uses those LEDs to relay coded feedback. Once control passes over to the PostScript interpreter, the engine sensing system engages and LEDs do correlate to their labels. When POST does detect an error, it exits the LED-extinguishing sequence and alternately flashes the toner and jam LEDs until you turn off the printer.
Troubleshooting Printer Diagnostic (EPOST) - 4 Printer Diagnostic (EPOST) Whereas the Power-On Self Test (POST) occurs during every printer startup, the Extended Power-On Self Test (EPOST) occurs only with intervention of the service technician. EPOST is a diagnostic built into the I/O controller board that is designed to run when the printer is in a modified state of operation.
Troubleshooting Printer Diagnostic (EPOST) - 5 If EPOST detects an error, the LEDs will cycle through the following sequence until you turn off the printer. The QuickTime movie below animates this cycle. • All LEDs on for one second • All LEDs off for one second • Failure error code for two seconds • All LEDs off for one second Caution: When you have finished running the Extended POST diagnostic, be sure to remove the serial loopback cable and set the configuration switch in its original position.
Troubleshooting Printer Diagnostic (EPOST) - 6 Ê I/O Controller Board Fuser Assembly ROM SIMM A Laser/Scanner Assembly RAM Size Misc.
Troubleshooting Printer Diagnostic (EPOST) - 7 The LaserWriter 16/600 PS requires the mini DIN-8 serial loopback connector that is listed as part of one of the diagnostics kits available from Apple. This connector can also be ordered separately as part number 922-1489.
Troubleshooting Printer Diagnostic (EPOST) - 8 For those service providers who would like to build their own loopback connector, the plug consists of a male mini DIN-8 connector with pins 1 and 2 tied together using a piece of smallgauge wire-wrap wire.
Troubleshooting Maintaining I/O Connectivity - 9 Maintaining I/O Connectivity If you want to troubleshoot the printer while maintaining connectivity to a host computer, you must temporarily reposition the printer’s I/O controller board. In this reconfigured state, you will be able to print from a paper source other than the standard cassette, observe the behavior of LEDs during startup, or run the printer diagnostic, while still having the engine open for troubleshooting.
Troubleshooting Maintaining I/O Connectivity Maintaining I/O Connectivity - 10 Ê J207 I/O Board Quadra 900/950 Floppy Drive Cable
Troubleshooting Troubleshooting Tips - 11 Troubleshooting Tips Multimeter Probes The connectors within the LaserWriter 16/600 PS are very small and require sharp needle-point probes to make good contact. Do not use probes that do not make proper contact. To see whether a set of probes works properly, test resistance at connector J210 on the DC controller board in the manner described below (the cable must connected to the board). Set your multimeter to resistance and insert the probes at pins 1 and 10.
Troubleshooting Troubleshooting Tips - 12 Forcing a Feed Cycle If you want to print from anything other than the standard 250sheet cassette tray, you must be connected to a CPU and select the feed option that you want. It is not possible to print a service test page from any source other than the standard cassette.
Troubleshooting Troubleshooting Tips - 13 Interrupting a Print Cycle Interrupting a print cycle and inspecting the photosensitive drum can help isolate the cause of print quality problems. If the image on the surface of the drum exhibits the same problem as the printed page, the fault is before the drum, probably in the imaging system. If the image on the drum is OK, the fault is after the drum, probably in the fuser assembly, transfer block, or high-voltage power supply.
Troubleshooting Troubleshooting Tips - 14 Maintaining Pickup Connectivity To troubleshoot the paper pickup block, you must temporarily reconfigure the printer’s paper path so that the pickup block is exposed. In this reconfigured state, you will be able to take voltage readings from the pickup controller board and observe paper feeding from the cassette.
Troubleshooting Troubleshooting Tips - 15 hooked end of the green cleaning brush. Reinstall the top cover and cover liner and close the lid. If you want to test pickup from the multipurpose tray or the envelope feeder, you must maintain I/O connectivity (see previous topic). You cannot run a service test page from any source other than the standard 250-sheet cassette. Caution: Do not let the pickup controller board brush up against the metal chassis when performing this procedure.
Troubleshooting Troubleshooting Tips - 16 Defeating the Top Cover Interlock You may occasionally need to defeat the top cover interlock to simulate a “top cover shut” condition. To defeat this sensor, open the toner access cover and wedge a stiff, non-metallic insert into the interlock switch opening. Push the insert down to depress the interlock leaf spring.
Troubleshooting Troubleshooting Tips - 17 Defeating the Fuser Door Interlock You may occasionally need to defeat the fuser door interlock to simulate a “fuser door shut” condition (for example if you wanted to observe paper as it exits the fuser rollers). To defeat this sensor, open the fuser access door and wedge the brush end of the green cleaning brush into the delivery/interlock sensor.
Troubleshooting Troubleshooting Tips - 18 Caution: Do not insert the brush too far into the sensor. After removing the brush, make sure that the delivery sensing arm moves freely and is not snagged.
Troubleshooting Troubleshooting Tips - 19 Sheet Feeder Bypass You can visually troubleshoot a functioning stand-alone sheet feeder by bypassing connector J603 on the printer’s pickup controller board. Disable the startup test page, and remove the top cover, rear panel, and right corner panel from the printer. Disconnect J603 from the exposed edge of the pickup controller board and connect a spare sheet feeder interface cable (P/N 922-0219).
Troubleshooting Troubleshooting Tips - 20 Observing Envelope Feed You can visually inspect and/or take multimeter readings from a fully functioning envelope feeder. Remove the covers of the feeder and install it into the printer. The feeder will operate in normal fashion.
Troubleshooting Troubleshooting Tips - 21 Drum Exposure Cover the toner cartridge when you remove it from the printer. Prolonged exposure to light can result in print quality problems. If this has occurred, store the toner cartridge in a dark place. The drum will return to its normal condition after about 24 hours.
Troubleshooting Capacitor Discharge - 22 Capacitor Discharge When there is a failure of the fusing system, the DC controller board shuts off current to the fuser roller heater and charges capacitor C208 to prevent overheating. If there is a failure of the fusing system, you must turn the power off for about 10 minutes or manually discharge the capacitor before switching power back on.
Troubleshooting Capacitor Discharge - 23 Caution: Be sure to switch off power and unplug the printer before performing this procedure. To discharge capacitor C208, switch off the printer and remove the rear panel, I/O controller board, and I/O shield. Carefully jumper the two wires at the base of the capacitor using some kind of conductor. Note: There are many different tools that can be used to discharge the capacitor: a flat blade screwdriver, paper clip, or aluminum foil doubled over.
Troubleshooting Capacitor Discharge - 24 Discharging Capacitor C208 C208
Troubleshooting Expansion Post Connectors - 25 Expansion Post Connectors The LaserWriter 16/600 PS has several cable receptacles that are secured to the printer by finned post connectors. The fins expand when you insert the connector, but once the connector is installed it can be difficult to remove. If you cannot remove these connectors with your fingers, try small bent-nose pliers, a 5 mm nut driver, or grip-rings forced around the post. Caution: The cable receptacles are keyed.
Troubleshooting Expansion Post Connectors - 26 Fin Cross Section Fin Expansion Post Connector
Troubleshooting Toner Cartridge Modification - 27 Toner Cartridge Modification LaserWriter toner cartridge part number M2473G/A is the only cartridge from Apple specifically designed for the LaserWriter 16/600 PS. However, you may also use Revision B LaserWriter Pro 600/630 toner cartridges in the LaserWriter 16/600 PS. The Revision B cartridges were introduced in late 1993 and were designed to be forward-compatible.
Troubleshooting Toner Cartridge Modification Toner Cartridge Modification - 28
Troubleshooting Circuit Board Diagrams - 29 Circuit Board Diagrams On the following pages are diagrams of the circuit boards and high-voltage contacts listed below: • I/O Controller Board • Fax Card (Domestic) • Fax Card (International) • DC Controller Board • Pickup Controller Board • Pickup Sensor Board • High-Voltage Power Supply • Envelope Feeder Controller Board • Sheet Feeder Controller Board
Troubleshooting Circuit Board Diagrams - 30 ROM SIMM Slots (empty if soldered ROM) RAM SIMMs I/O Controller Board (To Engine) J1 Configuration Switch Centronics Parallel BA DC IOP ROM J15 Fax Soldered ROM (not present on all boards) J23 Opening for Fax Port Ethernet LocalTalk (To Power) J21 Connector for Internal Hard Drive (see “Addiing Hard Drives” in Upgradess) SCSI
Troubleshooting Circuit Board Diagrams - 31 Fax Card (Domestic) Solder Side Component Side Speaker Fax Card (Domestic) Fuse J2 (Fax Card) mates into J15 (I/O Board) Ghosted image is outline of I/O controller board.
Troubleshooting Circuit Board Diagrams - 32 Fax Card (International) Solder Side Fax Card (International) J3 (Fax Card) mates into J15 (I/O Board) Ghosted image is outline of I/O controller board.
Troubleshooting Circuit Board Diagrams - 33 DC Controller Board VR201 (see “Registration Adjustment” in Adjustments.
Troubleshooting Service Test Page Button Circuit Board Diagrams - 34 Pickup Controller Board SW602 SW601 Cover Interlock Switch J601 J603 J604 J604 J602 J605 Cassette Size Microswitches SW603 SW604 SW605 J605
Troubleshooting Circuit Board Diagrams - 35 Pickup Sensor Board PS702 Multipurpose Tray Paper-Present Sensor J704 J703 J702 PS701 Multipurpose Tray Paper-End Sensor Pickup Controller Board Receptacle J701
Troubleshooting Circuit Board Diagrams - 36 High-Voltage Power Supply PS Interface Board Receptacle TB406 J402 J401 TB405 VR401 TB404 TB403 TB402 TB401
Troubleshooting Circuit Board Diagrams - 37 Envelope Feeder Controller Board J931 PS931 J932
Troubleshooting Circuit Board Diagrams - 38 Sheet Feeder Controller Board J853 PS851 J851 J852 SW851 SW852 SW853 Tab Cutout Cassette Size Microswitches
Troubleshooting Wiring Diagram - 39 Wiring Diagram The LaserWriter 16/600 PS wiring diagram can be found on the next page. The detail in this document is too small to read easily at 100% view. You should either zoom into the diagram using the zoom tool above, or print the diagram on a laser printer with a resolution of 300 dpi (600 dpi preferred).
TB405 ANTIN TB403 TONER GND CARTRIDGE TB404 TRANSFER BLOCK 3 4 1 2 HV POWER SUPPLY 6 LED 5 4 STATUS PANEL 3 2 1 GND DISP4 DISP3 DISP2 DISP1 +5V J601 1 FM1 1 2 3 4 5 6 7 8 9 10 1112 13 14 15 16 17 18 19 20 J207 J201 1 2 3 4 5 6 7 8 9 10 1112 13 4 J603 6 7 1 J604 8 J602 4 1 1 J605 B A 5 1 M1 1 2 3 4 J131 MAIN MOTOR 6 1 2 3 4 5 6 7 J721 3 2 J743 LASER DRIVER PICKUP CONTROLLER BOARD (Solder Side) 1 2 3 4 SW851 J135 F F M3 A /A B /B 1 2 3 4 PS851 Sheet Feeder Paper-Pre
Troubleshooting Connector J136 Locator - 41 Connector J136 Locator J136 is the connector that the envelope feeder mates into. To see it, open the multipurpose tray and remove the closure panel. The illustration below shows the connector as it appears from the outside of the printer. A voltage reading of 24V between pins 1 (+24VA) and 4 (GND) during printer startup indicates that motor power is reaching the envelope feeder.
Troubleshooting Connector J743 Locator - 42 Connector J743 Locator J743 connects the fuser assembly to the high-voltage connecting block. A measurement of continuity between pins 1 and 8 indicates that the heater bulb and thermoprotector are intact. A measurement of continuity between pins 6 and 7 indicates that the thermistor is intact.
Troubleshooting Flowcharts and Tables LaserWriter 16/600 PS Troubleshooting Flowchart START Connect the printer to a known-good computer, install a toner cartridge, and fill the cassette tray. Does the power supply fan come on when you switch on the printer? No Go to Table 1. Yes Does the ready LED glow steadily after the printer warms up? No A Yes Try printing from each available paper source. If the printer does not pick up paper, or if the paper jams, go to Figure 3.
Troubleshooting Flowcharts and Tables 222 2 2 A Are all LEDs off? Yes Go to Table 2. No Are the toner-out and paper-jam LEDs flashing? Yes Perform the EPOST procedure (see the "Printer Diagnostic" topic). No Is the toner LED on or flashing? Yes Go to Table 3. No Is the paper-out LED on? Yes Go to Table 4. No Is the paper-jam LED on? Yes Go to Table 5. No If the ready LED flashes without stopping, disconnect the printer from the computer, and see if the problem persists.
Troubleshooting Flowcharts and Tables Troubleshooting Tables Important As you proceed through the steps in a table, remember to retry the printer each time you change its physical state–for example, when you replace a module. If the problem remains, reinstall the original module before proceeding to the next step in the table. Refer as necessary to the wiring diagram that follows the tables. Table 1.
Troubleshooting Flowcharts and Tables 222 2 2 Table 2. All LEDs Are Off After Printer Warmup Step Check Result Action 1 Are the top cover and fuser door closed? No Close them completely, and confirm that the plastic tab actuators on the doors are intact. No LEDs illuminate if either door is open. 2 Remove the rear panel and I/O shield. Is the status panel cable securely connected to J204 on the DC controller board? No Secure the cable.
Troubleshooting Flowcharts and Tables Table 3. Toner LED Is On or Flashes After Printer Warmup Step Check Result Action 1 Try a known-good toner cartridge. Does the problem persist? No Problem solved. 2 Have you recently serviced the printer and has this symptom existed ever since? Yes You probably did not fully reseat the high-voltage power supply, connector block, or transfer block assembly; or connector J210 on the DC Controller board is not secure.
Troubleshooting 222 2 Flowcharts and Tables Table 4. Paper-Out LED is On After Printer Warmup Step Check Result 1 Is the cassette empty or not installed? Yes Make sure that the cassette is present and has paper. 2 Remove the cassette and inspect the paper-sensing lever. Is the lever broken? Yes Replace the sensor holder assembly. 3 Defeat the cassette paper sensing lever by pushing it and holding it in (as if a cassette were present).
Troubleshooting Flowcharts and Tables Table 5. Paper-Jam LED is On After Printer Warmup Step Check Result Action 1 Is the delivery/interlock sensor snagged? Yes Remove the top cover and delivery roller assembly, and unsnag the sensor spring. The spring should be straight. If the actuator is snagged, it will not spring back and forth as you try to trip it. 2 Is the delivery-sensing lever snagged? Yes Remove the top cover and delivery roller assembly and see what is snagging the lever.
Troubleshooting 222 2 Flowcharts and Tables 2 Table 5. Paper-Jam LED is On After Printer Warmup (Continued) Step Check Result 7 Remove the paper pickup block and maintain pickup connectivity. Place probes between J601-7 (+5 V) and J601-11 (GND) on the solderside of the pickup controller board. Does the voltage measure 5 V? No Replace the DC-controller board-topickup-controller-board cable. 8 Place probes between J605-6 (RESS) and J605-5 (GND).
Troubleshooting Flowcharts and Tables Table 6. Fuser Assembly Error (Continued) Step Check Result Action 3 Remove the fuser assembly and let it cool. Measure the resistance between J743-6 and J743-7 on the fuser. (Refer to the wiring diagram for illustration and pin layout of connector J743.) Does the resistance measure between 180 and 280 kΩ? No Disconnect J744 and check for same resistance. Replace the thermistor or the connector cable, as needed.
Troubleshooting Flowcharts and Tables 222 2 2 Table 7. Laser/Scanner Error Step Check Result Action 1 Remove the rear panel and I/O shield. Are the DC controller board connectors J205 and J206 secure? No Secure the cables. 2 Remove the top cover and delivery roller assembly. Are all three laser/scanner assembly connectors secure? No Secure the cables. 3 Remove the two cables that run from the DC controller board to the laser/scanner assembly and check the resistance of each.
Troubleshooting Flowcharts and Tables Table 9. Fan Error Step Check Result 1 Remove the rear panel and I/O shield. Are the fan cables secure at J209, J214, and J213 on the DC controller board? No Secure the cables. 2 Observe fan operation of FM1 (power supply fan), FM2 (controller board fan), and FM3 (internal fan). FM1 and FM2 exhaust outward through the vents in the external plastics.
Troubleshooting 222 2 Flowcharts and Tables 2 Table 10. I/O Board Error Step Check Result Action 1 Do the diagnostic LEDs indicate an I/O board error? Yes Replace the I/O board. 2 Did you receive a SIMM error? Yes Replace the faulty SIMM. 3 Did you receive a ROM error? Yes Replace the I/O board.
Troubleshooting Flowcharts and Tables The following graphic shows examples of image quality defects. Refer to theappropriate troubleshooting table to correct the quality of the image.
Troubleshooting 222 2 Flowcharts and Tables 2 Table 11. All-Blank Page Step Check Result Action 1 Is the sealing tape removed from the toner cartridge? No Remove the sealing tape. 2 Have you recently installed a laser/scanner unit and has this symptom existed since? Yes The laser shutter may have been installed incorrectly. The shutter should spring back and forth as you insert the toner cartridge.
Troubleshooting Flowcharts and Tables Table 12. All-Black page Step Check Result Action 1 Run the Extended PowerOn Self Test (see “Printer Diagnostics”). Does the test indicate a specific error? Yes Go to the appropriate troubleshooting table that describes the error indicated. 2 Place probes between J210-9 (SLO2) and J210-10 (GND). Does the voltage measure approximately 0.7 V about one second after the main motor starts? No Replace the DC controller board.
Troubleshooting Flowcharts and Tables 222 2 2 Table 13. Uniformly Light/Faded Image Over Entire Page Step Check Result Action 1 Adjust the density using the Printer Utility. Does the problem persist? No Problem solved. 2 Try printing with known-good paper. Does the problem persist? No Problem solved. 3 Replace the transfer roller with a known-good transfer roller. Does the problem persist? No Problem solved.
Troubleshooting Flowcharts and Tables Table 14. Uniformly Dark Image Over Entire Page Step Check Result Action 1 Adjust the density using the Printer Utility. Does the problem persist? No Problem solved. 2 Try printing with known-good paper. Does the problem persist? No Problem solved. 3 Clean the printer drum grounding contact and cartridge contact and print a test page. Does the problem persist? No Problem solved. 4 Remove the rear panel and I/O shield.
Troubleshooting Flowcharts and Tables 222 2 2 Table 16. White Vertical Lines, Sharp and Well-Defined Step Check Result Action 1 Try a known-good toner cartridge. Does the problem persist? No Problem solved. 2 Is there a hair or other obstruction that can be blocking the laser beam? Yes Remove the obstruction. 3 Does the symptom appear on the service test page? No Replace the I/O board. Yes Replace the laser/scanner assembly. 2 2 Table 17.
Troubleshooting Flowcharts and Tables Table 18. Bad Registration/Image Cut Off Step Check Result Action 1 Try printing with less paper at the source. Does the problem persist? No Problem solved. 2 Run a print from a different paper source. Does the problem persist? No Replace or reinstall the faulty pickup roller. 3 Perform the registration adjustment (see ”Registration Adjustment” in this chapter). Does the problem persist? No Problem solved. Yes Replace the sensor holder assembly.
Troubleshooting Flowcharts and Tables 222 2 2 Table 20. Vertical Elongation or Foreshortening Step Check Result Action 1 Run the Extended PowerOn Self Test (see “Printer Diagnostics”). Does the test indicate a specific error? Yes Go to the appropriate troubleshooting table that describes the error indicated. No Perform the first module exchange listed below. If the problem persists, reinstall the original module and perform the next exchange: • Replace the laser/scanner assembly.
Troubleshooting Flowcharts and Tables Table 23. Toner on Back of Page Step 1 Check Result Is the toner smudge in a small area behind the upper-left corner of the page? Action Yes Clean or replace the pickup roller. No Clean with a dry, lint-free cloth or replace the transfer roller, transfer guide assembly, or lower fuser roller. Table 24.
Troubleshooting 222 2 Flowcharts and Tables 2 Table 26. Picking Up From Wrong Source Step 1 Check Result Is the selected paper source empty? Action Yes Select Paper Handling in the Apple Printer Utility and disable the Tray Switching option if you do not want paper to feed from a secondary source when the selected source is empty. No There is a problem in the sensing system. Make sure that automatic tray switching is off and try printing again.
Troubleshooting Flowcharts and Tables Table 27. No Pickup From Envelope Feeder Step Check Result Action 1 Is paper picking up correctly from the standard cassette? No Go to Table 29. 2 Remove the left, right, and bottom covers of the envelope feeder and install the feeder into the pickup block. Do the envelope feeder motor and gearing engage after you restart? Yes Remove the paper pickup block from the printer and maintain pickup connectivity (see “Troubleshooting Tips” in this chapter).
Troubleshooting 222 2 Flowcharts and Tables 2 Table 28. No Pickup From Multipurpose Tray Step Check Result Action 1 Is paper picking up correctly from the standard cassette? No Go to Table 29 2 Maintain I/O connectivity (see “Troubleshooting Tips” in this chapter).
Troubleshooting Flowcharts and Tables Table 29. No Pickup From Standard Cassette Step Check Result Action 1 Initiate a service test page. Does the printer pickup from the standard cassette? Yes Confirm that I/O cable connections are secure and that configuration settings are correct. To make certain that networking or CPU software is not the root problem, confirm through the printer utility that the startup page is enabled, and restart the printer.
Troubleshooting 222 2 Flowcharts and Tables 2 Table 29. No Pickup From Standard Cassette (Continued) Step Check Result 6 Disconnect J201 on the DC controller board. Place probes between pins J201-1 (GND) and J201-13 (+24 V) on the male connector on the board. Does the voltage measure 24 V? No Replace the DC controller board. Yes Replace the pickup-to-DC controller board cable. Place probes between pins J201-1 (GND) and J201-7 (+5 V) on the male connector on the board.
Troubleshooting Flowcharts and Tables Table 30. No Pickup From Lower Cassette Step Check Result Action 1 Is paper picking up correctly from the standard cassette? No Go to Table 29. 2 Disable the startup test page, and remove the top cover, rear panel, and right corner panel from the printer. Disconnect J603 from the exposed edge of the controller board and connect a spare sheet feeder interface cable. Plug the opposite end of the interface cable into the sheet feeder receptacle.
Troubleshooting 222 2 Flowcharts and Tables 2 Table 30. No Pickup From Lower Cassette (Continued) Step Check Result Action 5 Remove the paper pickup block and maintain pickup connectivity (see “Troubleshooting Tips” in this chapter). Place probes on the solder side of the pickup controller board on J603-4 (GND) and the power supply side of diode D606. Does the voltage measure 5 V when you switch on the printer? Yes Perform the first module exchange listed below.
Troubleshooting Flowcharts and Tables Table 31. Leading Edge of Jammed Paper Is in Fuser/Delivery Area Step Check Result Action 1 Do the delivery rollers turn when you start up the printer? No Go to Step 6. 2 Is there crumpled paper just outside the exit point of the fuser assembly? Yes A snagged sensing lever is probably the cause of the problem. Remove the top cover and delivery roller assembly, and inspect the delivery/interlock sensor. If the delivery-sensing lever is broken, replace it.
Troubleshooting Flowcharts and Tables 222 2 Table 32. Leading Edge of Jammed Paper Is in Pickup/Transfer Area Step Check Result 2 Action 1 Try printing with known-good paper. Does the problem persist? No Problem solved. 2 Try feeding the paper from one of the other paper sources. Does jamming still occur? No Go to Table 33, 34, 35, or 36, as applicable. 3 Remove the toner cartridge, hold the green knob, and lift the delivery guide.
Troubleshooting Flowcharts and Tables Table 33. Paper Jams in Pickup/Transfer Area When Feeding From the Standard Cassette Step Check Result Action 1 Is the black ribbed paper guide firmly seated? No Reseat the black ribbed paper guide. If this guide is damaged or unseated, paper may jam at the entrance to the paper pickup block. 2 Is the white passive roller on the cassette OK? No Clean the roller so that it forms a smooth gripping surface against the lower feed roller.
Troubleshooting 222 2 Flowcharts and Tables Table 35. Paper Jams in Pickup/Transfer Area When Feeding From the Optional Sheet Feeder Step Check Result Action 1 Is the black ribbed paper guide firmly seated? No Reseat the black ribbed paper guide. If this guide is damaged or unseated, paper may jam at the entrance to the paper pickup block.
Troubleshooting Flowcharts and Tables Table 36. Paper Jams in Pickup/Transfer Area When Feeding From the Envelope Feeder Step Check Result Action 1 Is the envelope feeder width guide set correctly? No Set the guide so that it is snug against the edge of the envelopes. 2 Is the envelope feeder correctly installed into the printer? No Reinstall the feeder so that it is mounted solidly onto the black positioning pin in the upper-left corner of the pickup block opening.
K Service Source Take Apart LaserWriter 16/600 PS
Take Apart Rear Panel - 1 Rear Panel No preliminary steps are required before you begin this procedure.
Take Apart Rear Panel - 2 1 Cover Liner Screw 2 Rear Panel Open the toner access cover and remove the cover liner screw. Grip the upper corner of the rear panel with your left hand as shown.
Take Apart Rear Panel - 3 3 Hook Hook Hook Place your right fingertips on the I/Olabel end of the rear panel, swing the panel outwards, and remove the panel from the printer. Replacement Note: Angle the three hooks in the rear panel into the openings in the right rear panel. Then swing the rear panel closed, being sure to slide the tab beneath the cover liner.
Take Apart Rear Panel - 4 up, gently strike the I/O-label end of the panel with the base of your palm to position the panel properly.
Take Apart Top Cover - 5 Top Cover Top Cover Before you begin, open the multipurpose tray and remove the rear panel Note: The cover liner comes off with the removal of the top cover.
Take Apart Screw Top Cover - 6 Screw 1 Remove the two screws inside the fuser access door.
Take Apart Top Cover - 7 2 Using a small flat-blade screwdriver, release the four flex tabs at the four locations indicated and separate the liner from the printer.
Take Apart Top Cover Top Cover - 8 Cover Liner 3 Remove the top cover and cover liner from the printer.
Take Apart Top Cover - 9 Replacement Note: When you reseat the top cover and cover liner, reach through and gently press the delivery surface until the levelling pin pops into place.
Take Apart Top Cover - 10 Replacement Note: The two hinge assemblies are identical and are fully interchangeable. The components are also universal (that is, each of the four arms, four housings, and two pins are identical.) The illustration shows the hinge assembly in its correct intact state with the pin exploded out for clarity.
Take Apart Front Panel - 11 Front Panel Before you begin, remove the following: • Rear panel • Top cover Front Panel
Take Apart Front Panel - 12 Tab 2 Tab 3 Tab 1 Tab 4 Note: The front panel is secured to the printer by three fixed wrap-around tabs (1, 3, 4), one flex tab (2), and six positioning tabs and blocks along the base. The following pages describe the order of tab release.
Take Apart Front Panel - 13 Releasing Tab 1 1 Tab 1 Grasp the front panel with your fingertips and pull it outward slightly to release the upper fixed tab on the right side.
Take Apart Front Panel - 14 Releasing Tab 2 2 Tab 2 Tab 2 Reach behind the front panel and release the flex tab that secures the front panel to the chassis.
Take Apart Front Panel - 15 Cassette Stop Cover Releasing Tabs 3 and 4 3 4 Remove the cassette stop cover. Note: The status panel will still connect the chassis to the front panel after you perform the following step. Grip the bottom-left and bottom-right corners with your fingertips, release tabs 3 and 4, and swing the front panel downward.
Take Apart Front Panel - 16 5 Tab Tab Status Panel Tab Tab If you need to have functional LEDs after you remove the panel, don’t disconnect the connector. Simply release the tabs and lift off the whole status panel. If you don’t need functional LEDs, disconnect the cable from the status panel connector and remove the front panel.
Take Apart I/O Board - 17 I/O Board I/O Board Before you begin, remove the following: • Rear panel • Internal hard drive (if present) • Fax card (if present) Note: If the I/O board is removed from the printer, the LEDs no longer function. Note: Remove the SIMMs before returning a defective I/O board to Apple.
Take Apart I/O Board - 18 1 Power Supply Cable Disconnect the power supply cable.
Take Apart I/O Board - 19 2 Printer Interface Cable Disconnect the printer interface cable.
Take Apart I/O Board - 20 3 Remove the 5 screws that secure the I/O board to the printer.
Take Apart I/O Board - 21 4 Lift the I/O board out of the printer.
Take Apart I/O Shield - 22 I/O Shield I/O Shield Before you begin, remove the following: • Rear panel • I/O board
Take Apart I/O Shield - 23 1 Remove the 12 screws that connect the I/O shield to the chassis.
Take Apart I/O Shield - 24 2 Lift the I/O shield from the printer.
Take Apart Right Corner Panel - 25 Right Corner Panel Before you begin, remove the following: • Rear panel • Top cover 1 Right Corner Panel Remove the two screws that secure the right corner panel to the chassis.
Take Apart Right Corner Panel - 26 2 Access Hole Right Corner Panel 3 Reach into the access hole as shown in the photo at the left, and release the hidden flex tab. Remove the right corner panel from the printer.
Take Apart Multipurpose Tray Assembly - 27 Multipurpose Tray Assembly Before you begin, remove the following: • Paper cassette • Rear panel • Top cover • Right corner panel • Front panel Multipurpose Tray Assembly
Take Apart Multipurpose Tray Assembly - 28 1 2 Push on the rounded recess at the top of the tray cover and open the multipurpose tray. Bend the edge guide outward and release the left pin and then the right pin. Tilt the tray up into its normal closed position. Note: The tray cover and extension guide should now be in an open position as shown in the photograph at the left.
Take Apart Multipurpose Tray Assembly - 29 3 4 5 Grasp the sides of the cover and bend the center with your thumbs until the cover pops loose from its pin hinges. Remove the multi-purpose tray cover from the printer. Remove the two screws and lift off the lateral brace. Open the multipurpose tray until it angles downward and slide the tray off the holding pins.
Take Apart Multipurpose Closure Panel - 30 Multipurpose Closure Panel No preliminary steps are required before you begin this procedure. Note: The user removes this panel prior to installing the envelope feeder.
Take Apart Multipurpose Closure Panel - 31 1 Open the mulitpurpose tray cover by pressing on the cover and letting it drop into feed-ready position.
Take Apart Multipurpose Closure Panel - 32 2 Grasp the squared notch at the top of the panel between your thumb and forefinger, press down slightly, and lift out the panel.
Take Apart Fuser Access Door Fuser Access Door - 33 Fuser Access Door No preliminary steps are required before you begin this procedure.
Take Apart Fuser Access Door - 34 Strap Hinge 1 2 Open the fuser access door. Using needlenose pliers, squeeze the flex-tab end of the strap hinge and remove the hinge from its mount.
Take Apart Fuser Access Door - 35 3 Grasp the sides of the door and bend the center with your thumbs until the door pops loose from its pin hinges.
Take Apart Fuser Assembly - 36 Fuser Assembly No preliminary steps are required before you begin this procedure.
Take Apart Fuser Assembly - 37 – Fuser Thermosensor – Delivery-Sensing Lever Note: Unless noted otherwise, left and right are defined by viewing the printer through the fuser door opening.
Take Apart Fuser Assembly - 38 Strap Hinge 1 2 Open the fuser access door. Using needlenose pliers, squeeze the flex-tab end of the strap hinge and remove the hinge from its mount.
Take Apart Fuser Assembly - 39 3 4 Remove the two screws. Note: There is a receptacle left of center on the rear face of the fuser assembly. The receptacle mates with the high-voltage power supply and may cause slight resistance when you pull out the fuser in the following step. Raise the fuser slightly to clear the two positioning nibs, press down on the green jam-release arm, and pull out the fuser.
Take Apart Fuser Cable Cover Fuser Cable Cover - 40 Fuser Cable Cover Before you begin, remove the fuser assembly. Note: The fuser cable cover is the black plastic cover on the intake side of the fuser assembly. The yellow caution label is on the surface of this cover.
Take Apart Fuser Cable Cover - 41 Fuser Cable Cover B C A A B A Note: The cable cover is secured to the fuser by three pairs of flex tabs (A) and two conical posts (B) hidden behind the yellow label, and by a single flex tab (C) to the left of the entrance guide. Use a small flat-blade screwdriver to release the flex tabs. Start at the gear end of the fuser and work left.
Take Apart Fuser Cable Cover - 42 1 1 Fuser Cable Cover 2 First Pair of Tabs 3 4 2 Release the upper of the first pair of tabs (1) and pull the cover out as far as it will go (2). Then release the bottom tab (3) and pull the cover farther off the fuser assembly (4). Repeat this procedure for the next two pairs of flex tabs and remove the cover from the fuser.
Take Apart Left Fuser Cover Cap - 43 Left Cover Cap Left Fuser Cover Cap Before you begin, remove the fuser assembly. Note: The left fuser cover cap is the black plastic cap on the gear end of the fuser assembly.
Take Apart Left Fuser Cover Cap - 44 1 2 3 4 1 Left Cover Cap 2 Release the two flex tabs (1, 2) and pull the cap from the fuser as far as it will go. Using a small flat-blade screwdriver, unseat the two fixed tabs (3, 4) and pull the cap off the fuser assembly.
Take Apart Left Fuser Cover Cap - 45 Heater Bulb Cables Tracking Channel Replacement Note: Be sure to press the cables into the tracking channel in the left cover before you replace the cover cap.
Take Apart Left Fuser Cover - 46 Left Fuser Cover Fuser Assembly Left Fuser Cover Before you begin, remove the following: • Fuser assembly • Fuser cable cover • Left fuser cover cap Note: The left fuser cover is the black plastic cover that sits beneath the cover cap on the gear end of the fuser. The left fuser cover supports the end of the heater bulb and encloses the fuser gears.
Take Apart Left Fuser Cover - 47 1 Black Cable 2 2 White Cable Junction Cap 1 Remove the two screws (1 and 2). Remove the black cable from the channel and disconnect the white cable at the junction cap.
Take Apart Left Fuser Cover - 48 3 23T Gear 19T Gear Left Cover Pull off the cover. Caution: The two gears slide off the fuser if you turn the fuser on end. If you are replacing other pieces, remove the gears and set them aside.
Take Apart Fuser Connector Cable - 49 Fuser Connector Cable Fuser Connector Cable J743 J744 Fuser Assembly Before you begin, remove the following: • Fuser assembly • Fuser cable cover • Left fuser cover cap Note: The fuser connector cable delivers high-voltage power to the fuser bulb and receives temperature feedback from the thermosensor.
Take Apart Fuser Connector Cable - 50 Fuser Connector Cable the heater bulb circuit goes to the right. 1 2 Thermosensor Cable Receptacle Unplug the thermosensor cable and slide the receptacle off the frame. Remove the screw that secures the fuser connector cable to the thermoprotector contact.
Take Apart Fuser Connector Cable - 51 3 Junction Cap Disconnect the white heater bulb cable at the junction cap on the gear end of the fuser.
Take Apart Fuser Connector Cable - 52 4 Channel Remove the fuser connector cable from the channel in the left fuser cover.
Take Apart Fuser Connector Cable - 53 5 Expansion Posts Receptacle Release the expansion posts behind the receptacle and remove the connector cable from the fuser assembly.
Take Apart Fuser Thermoprotector Fuser Thermoprotector - 54 Fuser Thermoprotector Before you begin, remove the following: • Fuser assembly • Fuser cable cover Note: The fuser thermoprotector prevents overheating of the fuser bulb. Fuser Assembly Caution: When the thermoprotector has blown, replacing it does not necessarily solve the problem.
Take Apart Fuser Thermoprotector - 55 investigate root causes of the overheating. 1 2 1 2 Flex Tab Thermoprotector Remove the two screws that secure the cables to the thermoprotector contacts. Press the flex tab that is visible just under the right cover and pop out the thermoprotector assembly.
Take Apart Right Fuser Cover - 56 Right Fuser Cover Right Fuser Cover Before you begin, remove the following: • Fuser assembly • Fuser cable cover Note: The right fuser cover is the black plastic cover on the lever end of the fuser assembly. The right fuser cover supports the end of the heater bulb and routes the thermosensor cabling.
Take Apart Right Fuser Cover - 57 1 2 Heater Bulb Cable Thermosensor Cable Unplug the thermosensor cable. Remove the screw that secures the heater bulb cable to the thermoprotector contact.
Take Apart Right Fuser Cover - 58 3 Thermosensor Cable Remove the thermosensor cable from the channel in the fuser cover.
Take Apart Right Fuser Cover - 59 4 5 Remove the two brass colored screws. Pull the cover down slightly to unseat it from the upper frame, and lift the cover off the fuser. Note: It may be necessary to pry a bit between the cover and the frame with a small flat-blade screwdriver. 1 2 Replacement Note: Make sure that the roller release lever is set in place correctly prior to reassembly.
Take Apart Fuser Heater Bulb Fuser Assembly Fuser Heater Bulb - 60 Fuser Heater Bulb Before you begin, remove the following: • Fuser assembly • Fuser cable cover • Left fuser cover cap • Left fuser cover • Right fuser cover
Take Apart Fuser Heater Bulb - 61 Fuser Heater Bulb 1 Note: Be careful not to touch the glass part of the bulb with your fingers. Grasp the left end of the bulb and carefully slide the bulb out of the fuser assembly.
Take Apart Upper Fuser Frame Fuser Assembly Upper Fuser Frame - 62 Upper Fuser Frame Before you begin, remove the following: • Fuser assembly • Fuser cable cover • Fuser thermoprotector • Left fuser cover cap • Right fuser cover
Take Apart Upper Fuser Frame - 63 Spring Upper Frame Note: In the following steps, only the spring and the catch on the near side are shown in the drawing. 1 2 Catch Remove the two springs. Release the catches at each end of the upper frame and lift the frame up and off the fuser assembly.
Take Apart Fuser Thermosensor Fuser Assembly Fuser Thermosensor - 64 Fuser Thermosensor Before you begin, remove the following: • Fuser assembly • Fuser cable cover • Fuser thermoprotector • Left fuser cover cap • Right fuser cover • Upper fuser frame Note: The thermosensor monitors the temperature of the fuser bulb and relays the temperature back to the DC controller board.
Take Apart Fuser Thermosensor - 65 1 Thermosensor Upper Frame Remove the screw that connects the thermosensor to the upper fuser frame and lift off the thermosensor.
Take Apart DeliverySensing Lever Fuser Assembly Delivery-Sensing Lever - 66 Delivery-Sensing Lever Before you begin, remove the following: • Fuser assembly • Fuser cable cover • Fuser thermoprotector • Left fuser cover cap • Right fuser cover • Upper fuser frame Note: Paper exiting the fuser trips the deliverysensing lever, which in turn opens a photo interrupter in the delivery/interlock sensor assembly.
Take Apart Delivery-Sensing Lever - 67 “Sensing System Theory” in Basics. Separation Guide 1 Pin 2 Note: There are two pins at the ends of the separation guide that seat into the frame. Only one end is shown in the drawing. Using a small flat-blade screwdriver, pry the separation guide off the frame at the gear end of the fuser assembly. Lift the separation guide from the fuser assembly.
Take Apart Delivery-Sensing Lever - 68 3 Separation Guide Sensing Lever Grip Connection Snap the lever out of the grip in the separation guide and pull the lever off the post.
Take Apart Delivery Roller Assembly - 69 Delivery Roller Assembly Before you begin, remove the following: • Rear panel • Top cover Delivery Roller Assembly Note: Refer to the following take-apart topics for further disassembly of the delivery roller assembly: – Upper Delivery Guide – Lower Delivery Roller Shaft – Upper Delivery Roller Shaft – Delivery Drive Belt
Take Apart Delivery Roller Assembly - 70 Note: The double-roller shaft design yields an S-shaped paper path that handles heavier paper than was possible in previous engines. As a result, there is no face-up delivery tray in the LaserWriter 16/600 PS.
Take Apart Delivery Roller Assembly - 71 Ground Plate 1 Disconnect the ground plate from the chassis.
Take Apart Delivery Roller Assembly - 72 2 Place your left hand as shown and press upward on the lower roller shaft.
Take Apart Delivery Roller Assembly - 73 3 1 2 Using a small flat-blade screwdriver, press in on the left gripper tab (1) and then the right tab (2), and disengage the assembly from the chassis.
Take Apart Delivery Roller Assembly - 74 4 Place your right hand opposite your left and pull the assembly from the printer, using the rolling motion indicated.
Take Apart Upper Delivery Guide Delivery Roller Assembly Upper Delivery Guide - 75 Upper Delivery Guide Before you begin, remove the following: • Rear panel • Top cover
Take Apart Upper Delivery Guide - 76 1 Disconnect the ground plate from the chassis. 3 Release the tab and grip on the left side and remove the delivery guide from the delivery roller assembly. 2 Release the flex tab on the right side of the delivery roller assembly and pop the delivery guide free of the upper delivery roller.
Take Apart Upper Delivery Guide - 77 Delivery Guide Pins Replacement Note: The four small delivery guide pins that hang freely on the upper shaft must point outward (with the flow of paper).
Take Apart Lower Delivery Roller Shaft Delivery Roller Assembly Lower Delivery Roller Shaft - 78 Lower Delivery Roller Shaft Before you begin, remove the following: • Rear panel • Top cover • Delivery roller assembly
Take Apart Lower Delivery Roller Shaft - 79 1 2 Remove the E-ring on the right side of the shaft and slide off the bushing. Caution: The four lower passive delivery rollers will fall out when you perform the following procedure. Push the delivery roller shaft to clear the left grip and drive belt and lift the shaft from the delivery roller assembly.
Take Apart Upper Delivery Roller Shaft Delivery Roller Assembly Upper Delivery Roller Shaft - 80 Upper Delivery Roller Shaft Before you begin, remove the following: • Rear panel • Top cover • Delivery roller assembly • Upper delivery guide
Take Apart Upper Delivery Roller Shaft - 81 1 2 Remove the E-ring on the right side of the shaft and slide off the bushing. Push the delivery roller shaft to clear the left grip and drive belt and lift the shaft from the delivery roller assembly.
Take Apart Upper Delivery Roller Shaft - 82 Delivery Guide Pins Replacement Note: The four small delivery guide pins that hang freely on the upper shaft must point outward (with the flow of paper).
Take Apart Delivery Drive Belt - 83 Delivery Drive Belt Delivery Drive Belt Before you begin, remove the following: • Rear panel • Top cover • Delivery roller assembly Note: This cogged belt transfers drive upward to the delivery roller shafts. See “Mechanical Drive Theory” in Basics.
Take Apart Delivery Drive Belt - 84 1 2 Lower Shaft Spring Remove the spring. Slip the drive belt off the gear on the lower delivery roller shaft.
Take Apart Delivery Drive Belt - 85 3 Pin Jam-Release Arm Rotate the green jamrelease arm counterclockwise as far as it will go, lifting the arm slightly to clear the small wedge-shaped pin.
Take Apart Delivery Drive Belt - 86 4 Pry off the jam-release arm with a small flatblade screwdriver. Note: The spindle is connected to the end plate so the gear is now free. It stays in place because the drive belt is holding it. 5 Push the belt through, slip off the gear, and pull out the drive belt.
Take Apart Delivery Drive Belt - 87 Replacement Note: The final step in replacement is the looping of the belt over the lower roller shaft gear. First, use the rounded end of the jam-release arm to stretch the belt outward. Then with your fingertips pressing the belt firmly against the side of the gear, slowly rotate the drive shaft and let the belt shift onto the gear.
Take Apart Delivery/Interlock Sensor Delivery/Interlock Sensor - 88 Delivery/Interlock Sensor Before you begin, remove the following: • Rear panel • Top cover • Delivery roller assembly Note: The delivery/ interlock sensor (PS201) senses closure of the fuser access door and the exiting of paper from the fuser assembly. See “Sensing System Theory” in Basics.
Take Apart Delivery/Interlock Sensor - 89 Cable 1 Disconnect the cable from the photo IC.
Take Apart Delivery/Interlock Sensor - 90 2 Upper Edge To remove the sensor holder from the printer, raise the upper edge and slide the holder upwards off the chassis.
Take Apart Laser/Scanner Assembly - 91 Laser/Scanner Assembly Laser/ Scanner Before you begin, remove the following: • Rear panel • Top cover • Delivery roller assembly Review “LaserWriter Safety” in Basics before working with the laser/scanner assembly. ±Warning: Note: The LaserWriter 16/ 600 PS laser/scanner assembly is available only as an integral assembly.
Take Apart Laser/Scanner Assembly - 92 subparts are available from Apple and no power adjustments are possible. 1 2 Remove the four cables from the cable clips and disconnect the cables at their connectors. Note: There is no fiber-optic cable in the LaserWriter 16/600 PS. Beam detection circuitry runs through the BD IC unit at connector J731 (see “Wiring Diagram” in Troubleshooting Info). Remove the four screws and lift the laser/scanner assembly from the printer.
Take Apart Laser/Scanner Assembly Shutter Lever Laser/Scanner Assembly - 93 Replacement Note: Make sure that the shutter and the shutter lever are reinstalled in the position shown. Confirm installation by pushing the lever against the edge of the shutter. The shutter should open freely when actuated by the lever, and the shutter should Laser Shutter spring back fully when you release it.
Take Apart DC Controller Board - 94 DC Controller Board DC Controller Board Before you begin, remove the following: • Rear panel • I/O board • I/O shield
Take Apart DC Controller Board - 95 1 2 3 Disconnect J103 from the power supply. Remove the all cables except for the engine interface cable and power supply connector TB201. Note: Do not attempt to remove connector TB201 from the DC controller board. Connector TB201 is hardwired to the board. Release the two flex tabs and pull the board out of the printer. Replacement Note: Set the bottom edge of the board into the two mounts and then snap the top into place.
Take Apart Power Supply - 96 Power Supply Power Supply Before you begin, remove the following: • Rear panel • I/O board • I/O shield
Take Apart Power Supply - 97 1 2 Note: Three screws secure the power supply to the chassis—one on the left side of the printer beneath the power inlet panel and two on the rear side. Pull off the power inlet panel that covers the main power switch and remove the three screws. Note: There is a receptacle on the rear face of the power supply. The receptacle mates with the high-voltage connector block and may cause slight resistance when you are pulling out the power supply.
Take Apart Main Motor - 98 Main Motor Main Motor Before you begin, remove the following: • Rear panel • I/O board • I/O shield • Power supply Note: The main motor is the motor mounted next to the DC controller board. The main motor powers the drive train from the toner cartridge forward through the delivery rollers. See “Mechanical Drive Theory” in Basics.
Take Apart Main Motor - 99 1 2 Remove the four brass colored screws that secure the motor to the printer chassis. Disconnect J131 from the main motor board and pull out the main motor.
Take Apart Drive Assembly - 100 Drive Assembly Drive Assembly Before you begin, remove the following: • Fuser assembly • Rear panel • I/O board • I/O shield • Power supply • Main motor Note: The drive assembly receives drive from the main motor and transfers it forward to the fuser assembly gears. See “Mechanical Drive Theory” in Basics.
Take Apart Drive Assembly - 101 1 2 3 Remove the two small silver-colored screws on the rear face of the chassis that secure the drive assembly to the printer. Note: The following step dislodges the positioning pins that seat into the chassis wall. Grip the edge of the assembly housing with needlenose pliers and pull it about 1/4 inch away from the chassis wall. Pull the drive assembly out the fuser side of the printer.
Take Apart Power Supply Fan - 102 Power Supply Fan Power Supply Fan Before you begin, remove the following: • Rear panel • Top cover • I/O board • I/O shield • Delivery roller assembly
Take Apart Power Supply Fan - 103 1 2 3 Remove the single inch-long screw that connects the metal bracket to the fan and fan duct and lift off the metal bracket. Disconnect J209 from the DC controller board. Using a small flat-blade screwdriver, release the four tabs and lift the fan out of the printer.
Take Apart Controller Board Fan - 104 Controller Board Fan Before you begin, remove the following: • Rear panel • I/O board • I/O shield • Right corner panel Controller Board Fan
Take Apart Controller Board Fan - 105 1 2 Remove the single inch-long screw that connects the fan to the metal chassis. Disconnect J214 from the DC controller board, thread the cable through the fan bracket, and remove the fan from the printer. Replacement Caution: Be sure to reinstall the fan with the label facing outward.
Take Apart Internal Fan Internal Fan - 106 Internal Fan Before you begin, remove the following: • Rear panel • I/O board • I/O shield • Top cover • Delivery roller assembly
Take Apart Internal Fan - 107 1 2 Remove the single screw that connects the fan to the metal chassis. Disconnect J213 from the DC controller board, slide the slightly to the right, and remove the fan from the printer.
Take Apart High-Voltage Power Supply - 108 High-Voltage Power Supply No preliminary steps are required before you begin this procedure. Note: The high-voltage power supply receives power from the high-voltage connector block and transfers it into the toner cartridge through contacts TB401 to TB406.
Take Apart High-Voltage Power Supply - 109 voltage power supply to Apple. 1 Turn over the printer. 3 Note: There are three hidden contacts and a pin connector that mate with the high-voltage connector block. They may cause slight resistance when you are performing this procedure. 2 Remove the two screws that secure the high-voltage power supply to the bottom chassis. Release the two flex tabs and pull the high-voltage power supply out of the printer.
Take Apart High-Voltage Connector Block - 110 High-Voltage Connector Block Before you begin, remove the following: • Rear panel • I/O board • I/O shield • Power supply • Fuser door • Fuser assembly • High-voltage power supply Ê High-Voltage Connector Block
Take Apart High-Voltage Connector Block - 111 1 2 3 4 5 Remove the screw that secures the right cassettte guide to the fuser end of the printer. Note: The tab referenced in the following step is accessible from behind the rear wall of the chassis. Release the single flex tab with your finger and shimmy the cassette guide off the printer. Disconnect J210 (the orange cabling) from the DC controller board.
Take Apart High-Voltage Connector Block - 112 Keyed Receptacle Notch Replacement Note: The cable receptacle is keyed and will not mate with the power supply if it is installed incorrectly. Looking from the rear of printer, with the printer sitting upright, the notched corner should be at the upper left.
Take Apart Paper Pickup Block - 113 Paper Pickup Block Before you begin, remove the following: • Rear panel • Top cover • Front panel • Right corner panel • Multipurpose tray assy • Multipurpose closure panel Paper Pickup Block
Take Apart Paper Pickup Block - 114 Note: Refer to the following take-apart topics for disassembly of the paper pickup block: – Pickup Controller Board – Pickup Sensor Board – Pickup Block Motor – Envelope Feeder Cable – Sensor Holder Assembly – Left Pickup Block Frame Note: The paper pickup block is not available from Apple as an intact module. 1 2 Remove the three brass-colored screws on the front chassis. Remove the two screws that secure the lateral brace to the chassis and lift off the brace.
Take Apart Paper Pickup Block - 115 3 4 5 Remove the two screws that secure the right edge of the pickup block to the chassis. Disconnect the two cables from the exposed edge of the pickup controller board. Grasp the pickup block and slide it out of the printer. Replacement Note: Perform the “Registration Adjustment” procedure (see Adjustments chapter).
Take Apart Pickup Controller Board - 116 Pickup Controller Board Pickup Controller Board Pickup Block Before you begin, remove the following: • Rear panel • Top cover • Front panel • Right corner panel • Multipurpose tray assy • Multipurpose closure panel • Paper pickup block Note: Control of the following parts either routes through or is located on the pickup controller
Take Apart Pickup Controller Board - 117 board: – Pickup sensor board – Pickup motor and drive gears – Top cover interlock switch – Service test page button – Cassette and envelope feeders – Cassette microswitches – Cassette paper sensor 1 2 Disconnect the two cables and remove the two screws that secure the board to the pickup block. Caution: The top cover interlock actuator is not attached to anything. Once you remove the board, the actuator can fall out and is difficult to find.
Take Apart Pickup Sensor Board - 118 Pickup Sensor Board Pickup Sensor Board Pickup Block Before you begin, remove the following: • Rear panel • Top cover • Front panel • Right corner panel • Multipurpose tray assy • Multipurpose closure panel • Paper pickup block • Pickup controller board Note: Control of the following parts either routes through or is located
Take Apart Pickup Sensor Board - 119 on the pickup sensor board: – Multipurpose feed sensor – Cassette feed sensor – Pickup motor and drive gears – Pickup solenoids 1 2 3 Turn over the pickup block so that it is resting on the 45° face of its end frames. Unhook the three tabs and snap off the sensor board cover. Disconnect the three cables at the gear end of the board.
Take Apart Pickup Sensor Board - 120 4 Note: In the following instruction, “left” is the gear end and “right” is the controller board end of the pickup block. Raise the board slightly to clear the two positioning pins, shift it about 1/2 inch to the left, rotate the right end upward, and remove the sensor board from the paper pickup block.
Take Apart Pickup Block Motor - 121 Pickup Block Motor Before you begin, remove the following: • Rear panel • Top cover • Front panel • Right corner panel • Multipurpose tray assy • Multipurpose closure panel • Paper pickup block Pickup Block Motor Pickup Block Note: The pickup block motor is the motor mounted in the left pickup block frame.
Take Apart Pickup Block Motor - 122 motor powers the drive train from paper pickup forward to the toner cartridge. See “Mechanical Drive Theory” in Basics. 1 2 3 Disconnect the middle cable from the pickup sensor board. Remove the pickup block motor cabling from the entire length of its retaining channel. Remove the two long brass-colored screws that secure the motor to the pickup block and lift out the motor.
Take Apart Cassette Pickup Roller - 123 Cassette Pickup Roller No preliminary steps are required before you begin this procedure.
Take Apart Cassette Pickup Roller - 124 1 2 Turn over the printer and locate the cassette tray pickup roller. Squeeze the spring release at the end of the roller shaft and slide off the pickup roller. Replacement Note: Make sure that the roller slides all the way in on the shaft and locks into place.
Take Apart Multipurpose Pickup Roller - 125 Multipurpose Pickup Roller Before you begin, remove multipurpose closure panel. 1 Multipurpose Pickup Roller Pickup Block Squeeze the spring release at the end of the roller shaft and slide off the pickup roller. Replacement Note: Make sure that the roller slides all the way in on the shaft and locks into place.
Take Apart Separation Pad - 126 Separation Pad Before you begin, remove the following: • Multipurpose closure panel • Multipurpose pickup roller Separation Pad Pickup Block Note: The separation pad is available as a part of the multipurpose tray guide assembly (P/N 9220286). Remove the separation pad from the new tray guide assembly and install it in the printer.
Take Apart Separation Pad - 127 1 Using a small flat-blade screwdriver, pry underneath the bottom edge of the separation pad and remove the pad.
Take Apart Envelope Feeder Cable - 128 Envelope Feeder Cable Envelope Feeder Cable J136 Pickup Block Before you begin, remove the following: • Rear panel • Top cover • Front panel • Right corner panel • Multipurpose tray assy • Multipurpose closure panel • Paper pickup block • Pickup controller board
Take Apart Envelope Feeder Cable - 129 1 Remove the cabling from the entire length of its retaining channel in the right pickup block. Note: If you are replacing the feeder cable without replacing the feeder cable mount, skip to step 7. 2 3 Note: The opening guide is the rounded metallic plate with the green knob at its far end. The opening guide hinges around a ring connection at the knob end and an open grip connection at the near end.
Take Apart Envelope Feeder Cable - 130 4 Note: The upper tray guide is the black piece below the opening guide. It has a rounded cutout on its far side that serves as a grip point for the step below. A flex tab and two posts are located at the controller end of the upper tray guide. Release the flex tab, shift the upper tray guide to clear the posts, and lift the guide out of the pickup block.
Take Apart Envelope Feeder Cable - 131 5 6 7 Remove the screw that secures the cable mount to the pickup block frame. Rotate the cable mount outward to free the two mounting tabs and remove it from the pickup block. Release the expansion posts behind the receptacle and remove the envelope feeder cable from the cable mount.
Take Apart Sensor Holder Assembly - 132 Sensor Holder Assembly Sensor Holder Assembly Pickup Block Before you begin, remove the following: • Rear panel • Top cover • Front panel • Right corner panel • Multipurpose tray assy • Multipurpose closure panel • Paper pickup block • Cassette pickup roller Note: The sensor holder assembly contains the cabling, actuators, and photo
Take Apart Sensor Holder Assembly - 133 interrupters for cassette paper sensor PS601 and registration paper sensor PS602. 1 2 Rest the entrance side of the pickup block flat on your work surface. Disconnect J605 from the pickup controller board.
Take Apart Sensor Holder Assembly - 134 3 Note: The sensor holder assembly is held in place by a positioning post at the far end and two pairs of tab connectors at the near end. Press the positioning post through the metal flange and grasp the throat of the pin with needlenose pliers.
Take Apart Sensor Holder Assembly - 135 4 Note: Pull the sensor holder assembly toward the gear end of the pickup block while you perform the following step. Release the two tabs, unmount the holder assembly, and shimmy it out of the pickup block.
Take Apart Left Pickup Block Frame - 136 Left Pickup Block Frame Before you begin, remove the following: • Rear panel • Top cover • Front panel • Right corner panel • Multipurpose tray assy • Multipurpose closure panel • Paper pickup block Left Pickup Block Frame Pickup Block Note: Removal of the left frame is necessary only if you need to get to some of the components on the inside
Take Apart Left Pickup Block Frame - 137 face of the frame, such as the feed rollers, gear mount, or the sensor arm. You must also remove the left frame to get the paper guide plate and its spring out of the pickup block. The Take Apart procedures do not address disassembly beyond this topic. 1 2 3 Set the pickup block on end with the left frame up. Remove the two black and two silver-colored screws that connect the frame to middle components. Lift the left frame straight up and off the pickup block.
Take Apart Left Pickup Block Frame - 138 Replacement Note: The key step in reassembly is correctly installing the paper guide plate and its spring. The guide plate presses against the gear that drives the multipurpose pickup roller. If the plate does not press against this gear, the pickup roller will either slip or remain in neutral and no paper will be pulled into the printer from the multipurpose tray. Your drum shaft end plate may differ from what is shown.
Take Apart Left Pickup Block Frame - 139 Reinstall the lower guide (the flexible guide with ribs) after the pickup block is intact. Temporarily loosen the four screws on the right block frame and release the frame about 1/8 inch to allow for the reseating of the lower guide.
Take Apart Transfer Roller - 140 Transfer Roller No preliminary steps are required before you begin this procedure.
Take Apart Transfer Roller - 141 1 Hook the left end of the roller with the green cleaning brush and pull the roller out of the printer. Replacement Note: Slide the right end of the roller into the slot and lower the gear end into place.
Take Apart Transfer Guide Assembly - 142 Transfer Guide Assembly Before you begin, remove the following: • Rear panel • Top cover • Front panel • Right corner panel • Multipurpose tray assy • Multipurpose closure panel • Paper pickup block Transfer Guide Assembly
Take Apart Transfer Guide Assembly - 143 1 Remove the two black screws that secure the transfer guide assembly to the toner cartridge guides and pull the transfer guide assembly out the right side of the printer.
Take Apart Transfer Block Assembly - 144 Transfer Block Assembly Before you begin, remove the following: • Rear panel • Top cover • Front panel • Right corner panel • Multipurpose tray assy • Multipurpose closure panel • Paper pickup block • Transfer guide assembly • Fuser assembly Transfer Block Assembly Ê
Take Apart Transfer Block Assembly - 145 1 2 3 4 For clearance purposes, loosen the nine silver-colored screws and the one upper black screw about 1/8 inch and shift the front wall outward. Remove the screw facing out through the fuser door that secures the feeder guide to the chassis. Pry under the toner-side edge of the assembly with a small flat-blade screwdriver and release the five tabs that secure the transfer block assembly to the chassis.
Take Apart Envelope Feeder - 146 Envelope Feeder Before you begin, remove the multipurpose closure panel. Note: Refer to the Envelope Feeder LW Pro-LW 16/6 manual for further information. 1 Envelope Feeder To install the envelope feeder, turn off the printer, slide the feeder into the paper pickup block, and turn on the printer.
Take Apart Sheet Feeder - 147 Sheet Feeder No preliminary steps are required before you begin this procedure. Note: Refer to the Sheet Feeder LW Pro-LW 16/6 manual for further information. 1 Sheet Feeder To install the sheet feeder, turn off the printer, place the printer in position over the feeder and lower the printer into position. Then turn on the printer.
K Service Source Upgrades LaserWriter 16/600 PS
Upgrades Upgrading RAM - 1 RAM SIMMs I/O Controller Board BA DC Upgrading RAM There are two RAM SIMM slots on the LaserWriter 16/600 PS I/O controller board, slot BA on the left and slot DC on the right. The printer comes with 8 MB of RAM installed in slot BA. You can increase the printer memory to a total of 32 MB by installing RAM SIMMs in one of the configurations shown on the next page.
Upgrades Upgrading RAM - 2 Caution: The SIMMs are very susceptible to ESD damage. To prevent damage, wear a grounding wriststrap. Review the ESD precautions in Bulletins/Safety. Table 1: RAM Configurations Total Slot BA Slot DC Note 8 MB 8 MB (empty) b 16 MB 8 MB 8 MB 12 MB 24 MB 32 MB a 8 MB 16 MB 16 MB 4 MB 8 MB 16 MB c d e No other configuration is supported.
Upgrades Upgrading RAM - 3 b c d e f receive an engine error when you start up the printer. This is the standard, as-shipped configuration. The is the minimum configuration to enable PhotoGrade. Note that this configuration requires moving the base 8 MB SIMM from the left to the right SIMM socket. Due to mechanical constraints, the left SIMM should always be installed before the right SIMM is installed. Return the original 8 MB SIMM to the customer. See next page for RAM specifications.
Upgrades Upgrading RAM - 4 RAM SIMM Specifications Length: 107.95 mm ± 0.20 mm (4.25 in. ± .008) Height: 25.53 mm (1.005 in.
Upgrades Upgrading RAM - 5 Note: 16 MB SIMMs must have a 2 KB row (11 bit x 11 bit) refresh configuration. 16 MB SIMMs with a 4 KB row (10 bit x 12 bit) refresh configuration are not compatible with this printer.
Upgrades Adding a Fax Card - 6 Adding a Fax Card Fax Card J15 (on I/O Board) Screw Ghosted image is outline of I/O controller board. There are two fax cards available for the LaserWriter 16/600 PS, one for USA and one international. Install the fax card in accordance with the instruction in the user guide. The fax card mates into connector J15 on the I/O board. One screw connects the fax card to a sheet metal flange on the I/O shield. The fax port aligns with a pinout opening in the I/O shield.
Upgrades Adding a Fax Card - 7 The domestic fax card has an on-board modem and an RJ-11 phone net port for direct connection into phone lines. The finished goods part number for the domestic fax card is M3298LL/A. The international fax card has a serial port for direct connection into an external modem. The finished goods part number for the international fax kit is M3299*/A.
Upgrades Adding Hard Drives - 8 Internal Hard Drive Barcode Label Ghosted image is outline of I/O controller board. External SCSI Connector Adding Hard Drives You can install one internal hard drive and attach up to six external SCSI hard drives to the LaserWriter 16/600 PS. Internal hard drives You can purchase an optional internal SCSI hard drive for the LaserWriter 16/600 PS. The finished goods part number for the internal hard drive is M3297G/A.
Upgrades Adding Hard Drives - 9 The internal drive mounts directly onto the printer’s I/O board using the three captive screws attached to the carrier. Note: When installing the hard drive, check the I/O serial number on the yellow barcode label in the upper right-hand corner of the I/O controller board. If the last four characters of the number are “34AA,” do not install the hard drive and return the I/O controller board to Apple.
Upgrades Adding Hard Drives - 10 not use SCSI ID #7 or ID #0. Caution: External hard drives must supply 5 volts DC to the SCSI bus to work properly. Check the documentation that came with the hard drive for information about SCSI voltage. The printer will not recognize any attached drive unless the drive is turned on before or at the same time that you start up the printer. If a hard drive is left off, the printer will detect an error and will not start up.
Upgrades Adding Hard Drives - 11 Note: You must initialize hard drives with the Apple Printer Utility (for Macintosh) or the Font Downloader in the Printer Setup dialog box (for Windows). If your computer communicates with the printer via DOS or a UNIX network, refer to the LaserWriter 16/600 PS user manual.
Upgrades IOP ROM v. 3.0 - 12 I/O Controller Board IOP ROM IOP ROM v. 3.0 Several network-oriented symptoms are addressed by version 3.0 of the Input/ Output Processor (IOP) ROM. This ROM is available as P/N 922-2458. Note: Version 2.0 of the IOP ROM has been discontinued. All fixes associated with that version are present in v3.0.
Upgrades IOP ROM v. 3.0 - 13 Note: The LaserWriter 16/600 PostScript ROMs are not affected by this IOP upgrade. The current version is v1.0. Rev PS: 1.0 I/O: 2.1 Determining IOP ROM Version Along the right edge of the startup page is a small line of text that reads Rev PS: 1.0 I/O: XX. The number represented here as XX is the version of IOP ROM currently installed in that printer.
Upgrades IOP ROM v. 3.0 - 14 Symptoms Associated with IOP ROM Ethernet lockups In version 1.0 of the IOP ROM, reception of an illegally sized packet greater than 1518 bytes caused the IOP to stop responding to network traffic. (Restarting the printer may temporarily resolve this problem.) This problem was resolved in IOP v2.0 and later. Customers should upgrade their IOP ROM to v3.0.
Upgrades IOP ROM v. 3.0 - 15 AppleTalk problems The following problems have been fixed with version 3.0 of the IOP ROM. • The printer’s EtherTalk stack stops responding during or after a broadcast storm (i.e. the printer disappears from the EtherTalk network even though TCP/IP and IPX continues to function.) • Helios EtherShare Print Server does not print with the EtherShare Accounting feature on.
Upgrades IOP ROM v. 3.0 - 16 printer accepting and storing in NVRAM an invalid ZIP GetNetInfo response. It no longer stores this value in NVRAM. If the connection with the router is lost and current zone is the default, the printer will return to the zone stored in NVRAM as set by the Apple Printer Utility. • EtherTalk now stores its current network number in VRAM and uses this number as its first guess on startup. • On very slow WAN network links, connections may have timed out.
Upgrades IOP ROM v. 3.0 - 17 The Apple LaserWriter 16/600 PS can be seen in the Chooser, but you cannot print to it. Restarting the printer may temporarily resolve this issue. Please note that the printer may require another solution instead, as similar symptoms may be caused by some versions of printer drivers or routers. If the problem persists after restarting the printer, try the following: • The symptom may be caused by earlier versions of the LaserWriter 8.x drivers. Upgrade to LaserWriter 8.2.
Upgrades IOP ROM v. 3.0 - 18 Software Installer 1.5 or later. Both these routers induce the symptoms only under specific circumstances. Note: LaserWriter driver or gleaning bugs are not specific to the LaserWriter 16/600 PS printer. Other printers or devices may also be affected. If none of the suggestions above is effective, upgrade the IOP ROM to v3.0.
Upgrades IOP ROM v. 3.0 - 19 The LaserWriter 16/600 PS is not visible on networks routed by Dayna PathFinder Routers. This symptom is caused by the LaserWriter 16/600 PS booting with a source network of 1 and the PathFinder not asserting itself to tell the printer what network range it should be in (most likely a number other than 1). In turn, the PathFinder won’t respond to the printer’s request for zone information, resulting in devices not being able to locate the printer.
Upgrades IOP ROM v. 3.0 - 20 The symptoms above are addressed in the v3.0 IOP ROM. Service Providers should replace the ROM. The LaserWriter 16/600 PS is slow when using Farallon PhoneNET Star Controllers. When a LaserWriter 16/600 PS is connected to a Farallon PhoneNET StarController, print jobs sent to the printer take a long time to print (typical) or may fail (rare) with PostScript errors.
Upgrades IOP ROM v. 3.0 - 21 IOP Does Not Close Jobs Correctly The IOP does not close jobs correctly (e.g., when a PostScript error is encountered) without an End of File (EOF) message; a second job following the first gets flushed by the PostScript interpreter (to the second job’s EOF), so neither the first job having the error nor the second job prints. A third job will print fine. This symptom is addressed in the v3.0 IOP ROM. Service Providers should replace the ROM.
Upgrades IOP ROM v. 3.0 - 22 Symptoms Not Associated with IOP ROM Note: The following issue is not related to the IOP ROM. The LaserWriter 16/600 PS returns to the default zone after being turned on. The configuration switch on the LaserWriter 16/600 PS must be in the up position if you want zone changes made with the Apple Printer Utility to be persistent across power cycles.
K Service Source Adjustments LaserWriter 16/600 PS
Adjustments Registration Adjustment - 1 Leading Edge of Paper Registration Adjustment Leading Edge Registration Distance Test Page Pattern Before you begin, remove the following: • Rear panel • Top cover You must perform the registration adjustment procedure whenever you replace the DC controller board, paper pickup block, or the laser/scanner assembly.
Adjustments Registration Adjustment - 2 on input from registration paper sensor PS602 (see “Sensing System Theory” in Basics) and adjustments made to varistor VR201 on the DC controller board. Optimum leading edge registration distance is 2 mm.
Adjustments Registration Adjustment - 3 1 +10 -10 +8 -8 +6 -6 -4 +4 +2 Clockwise (+) 0 -2 Counterclockwise (-) VR201 DC Controller Board 2 3 Using a jeweler’s screwdriver, reset VR201 on the DC controller board to “0.” Switch on the printer and wait for the printer to warm up. Press the service test page button three times to make three service test pages.
Adjustments Registration Adjustment - 4 4 Leading Edge Registration Distance Test Page Pattern Three Test Pages 5 Measure the distance from the top of each page to the edge of the printed test page pattern. Calculate the average distance by adding the three measurements and dividing by three.
Adjustments Registration Adjustment - 5 (-) Counterclockwise (Avg. distance > 2.0 mm) Correction Distance (mm) VR201 Setting -0.60 -2 -0.30 -1 -0.90 -3 -1.21 -1.51 -1.81 -2.11 -2.41 -2.71 -3.02 -4 -5 -6 -7 -8 -9 -10 (+) Clockwise (Avg. distance < 2.0 mm) Correction Distance (mm) VR201 Setting +2.71 +9 +3.02 +10 +2.41 +8 +2.11 +1.81 +1.51 +1.21 +0.90 +0.60 +0.30 +7 +6 +5 +4 +3 +2 +1 6 7 Adjust VR201 so that the average value becomes 2.0 mm (see the table to the left).
K Service Source Exploded View LaserWriter 16/600 PS
Exploded View 1 Overall Exploded View 16/600PS Exploded View Panel Power Inlet 922-0941 Fuser Access Door 922-0233 Top Cover Assembly 922-0234 Rear Panel 922-0942 Fuser Assembly 661-0091 (110/115 V) 661-0092 (220/240 V) Cover Liner 922-0229 Fan-Power Supply Assembly 922-0944 I/O Shield (not offered) I/O Board 661-0090 Delivery Roller Assembly 922-0292 Main Motor 922-1946 Laser/Scanner Assembly 661-0093 Internal Fan 922-0947 DC Controller Board 661-0094 Power Supply 661-0097 (110 V) 661-0098 (220
Exploded View 2 Delivery Roller Assembly Exploded View Upper Delivery Guide Delivery Drive Belt DELIVERY ROLLER ASSEMBLY Take-Apart Upper Delivery Roller Shaft Lower Delivery Roller Shaft
Exploded View 3 Fuser Assembly Exploded View FUSER ASSEMBLY Take-Apart Upper Frame Connector Cable Thermoprotector Thermosensor Left Cover Cap Left Cover Cable Cover Heater Bulb Right Cover DeliverySensing Lever
Exploded View 4 Pickup Block Exploded View Envelope Feeder Cable Pickup Controller Board Sensor Holder Assy PAPER PICKUP BLOCK Take-Apart Pickup Block Motor Left Frame Separation Pad Pickup Sensor Board
