Apple LaserWriter 8500 Service Source
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Apple LaserWriter 8500, Take Apart I/O Board - 32 to the shield 9 Remove the board, being careful to elevate the receptacle on the rear to clear the plate. Replacement Notes : • When replacing the I/O bracket, make sure that the three metal tabs slide in the cutouts in the shield. • Check the position of the reset button on the I/O bracket, and restore the setting if you have accidently changed it during this procedure. Receptacle Connector Metal Tabs Backside of I/O Shield
Take Apart Toner Sensor Assembly - 103 1 Release the hooks on the back side of the toner sensor assembly and hold the assembly away from the bracket. 2 Remove the toner sensor cable from the cutout at the end of the bracket and lift the assembly free. Hook Hook Toner Sensor Assembly Bracket of Manual Feed Sensor Assembly
Apple LaserWriter 8500, Take Apart Duplex Interface Board - 36 Duplex Interface Board Before you begin, remove the following: • Fuser access cover • Left top cover • Left cover assembly • Front left cover • I/O board Duplex Interface Board
Apple LaserWriter 8500, Take Apart Cassette Paper-Present Sensor - 69 present sensor. 2 Open the turn chute cover. 3 Use a small flat blade screwdriver to release the hooks of the cassette paper-present sensor, located on the inside of the printer frame (work from the rear of the printer), from the left cassette guide assembly. Note: Do not move the cassette paper-present sensor away, since it is connected with the feeder harness. 4 Disconnect P/J205 from the sensor. 5 Remove the sensor.
Apple LaserWriter 8500, Troubleshooting Image Defects - 30 13 No Duplexing If you have an optional duplexer installed, but pages are all printed one-sided, first make sure that you have the correct printer driver installed and that you have selected two-sided printing. Refer to “RAM Memory” in the Overview chapter. Printing in duplex mode requires a RAM upgrade, depending on paper size and PhotoGrade support. With insufficient RAM, the pages will be automatically be printed in simplex mode.
Apple LaserWriter 8500, Overview Form Factor - 6 Form Factor To achieve a reasonably compact form factor, the tail end of the cassette has been designed to extend out from the engine footprint (A). Consequently, the pickup rollers feed from the insertion end of the cassette (B), similar to the Laser- Writer II. This arrangement influences the architecture of the printer in the following ways. 1 Because pickup occurs deep within the printer, all mechanical drive elements are arranged vertically along the rear (C), resulting in a simple C-shaped paper path. This vertical arrangement yields a compact, low- mainte
Apple LaserWriter 8500, Take Apart Duplexer/Duplex Motor - 190 1 Disconnect the cable going into the motor. 2 Remove the two silver- colored screws that secure the motor to the chassis. 3 Remove the motor from the duplexer. Duplex Motor
Apple LaserWriter 8500, Take Apart Manual Feed Sensor Assembly - 97 5 Lift the left end of the sensor assembly from the printer frame just enough to get access to the two cable connectors. 6 Carefully disconnect the two cables and remove the sensor assembly from the printer. Manual Feed Sensor Assembly
Apple LaserWriter 8500, Take Apart Manual Feed Sensor Assembly - 95 Manual Feed Sensor Assembly No preliminary steps are required before you begin this procedure. 1 Open the manual feed cover and top cover and keep them open while you perform the steps below. 2 Remove the two screws securing the assembly to the printer frame (one at each end, facing outwards). Screw Screw Manual Feed Sensor Assembly
Apple LaserWriter 8500, Overview Miscellaneous - 14 Miscellaneous Full-Stack Sensor When the delivery tray is full of paper, the printer stops accepting print jobs and the controller reports an error message to the host computer. Sensing of delivery tray capacity is done through the full-stack sensor located just above the delivery rollers. With a duplexer installed, the duplexer full-stack sensor assumes this function. The parts used in the duplexer actuator and the printer actuator are not interchangeable. Other Sensors and Interlocks
Apple LaserWriter 8500, Take Apart Left Top Cover - 5 1 Open the manual feed tray and the top cover. 2 Remove the two screws securing the left top cover to the printer frame (one along the rear and one inside the manual feed compart- ment). 3 Pull out slightly on the left top cover to release the detent and rest the cover on its side atop the chassis. 4 Disconnect the status panel cable and remove the cover. Left Top Cover Top Cover Screw Screw Detent Status Panel Cable Status Panel Left Top Cover (On Its Side)
Take Apart Manual Feed Pickup Solenoid - 108 Manual Feed Pickup Solenoid Before you begin, remove the following: • Fuser access cover • Left top cover • Left cover assembly • Front left cover • I/O board • Duplex interface board • DC controller board • Manual feed sensor assembly Manual Feed Pickup Solenoid
Apple LaserWriter 8500, Take Apart Fuser Assembly - 27 Fuser Assembly Before you begin, remove the fuser access cover. Caution : Let the fuser assembly cool before performing this procedure. 1 Loosen the four captive screws securing the fuser assembly to the printer. Screw Screw Screw Fuser Assembly Screw
Apple LaserWriter 8500, Troubleshooting Flowchart 3 - 11 Flowchart 3 Symptom: Mechanical drive is not getting to the delivery rollers. This is very likely a result of cables that have not been reconnected. Remove the left cover and the I/O board and shield. Inspect the printer, taking special note of the main motor connector J16 on the DC controller board. Have you recently serviced the printer and has this symptom existed ever since? Does the problem still exist? Yes Yes No No Check to make sure that all the covers are closed and that a toner cartridge is installed. Visually inspect the fus
Take Apart Cassette Feeder Board - 34 1 Disconnect the cable going into the left side of the board. 2 Remove the four screws securing the cassette feeder board. Note : To loosen the bottom left screw, insert the screwdriver through the opening in the printer frame. Cassette Feeder Board Screw Screw Screw Screw Cable
Apple LaserWriter 8500, Take Apart Power Supply - 48 5 Disconnect all the cables going into the power supply. Replacement Note: Connector P127 is not used in this printer. The single wire orange cable goes into the P123 lead to the right of P127. 6 Remove the four screws securing the power supply to the chassis (two through the circuit board and two through the flange at the bottom). Screw Screw Screw ScrewPower Supply
Take Apart Lower Feed Roller - 78 Lower Feed Roller Before you begin, remove the following: • Fuser access cover • Left top cover • Left cover assembly • Front left cover • Right top cover • Right cover • Turn-in chute • Turn chute cover • I/O board • Turn clutch Lower Feed Roller
Apple LaserWriter 8500, Basics Function of Main Components - 3 Cassette Feed Components Cassette Feeder Board The feeder board has the paper size microswitches (see previous topic) and serves as a relay board for the signals between the cassette feed and the DC controller board. Cassette Paper-Present Sensor and Actuator This sensor detects the presence of paper in the cassette. Cassette Feed Solenoid and Feed Gear When the feed solenoid is actuated, the feed gear is releases and turns to engage with the feed idler gear. The feed gear then begins to rotate, causing the pickup rollers to rotate. After one revolution, the feed gea
Apple LaserWriter 8500, Take Apart Duplexer/Taping The Paper-Pass Actuator - 164 Taping The Paper-Pass Actuator Any time you have the upper and lower covers removed, the paper-pass actuator is exposed and extremely vulnerable to damage. To protect the actuator, tape it shut temporarily with removable tape or a Post-it™ note. Please remember to remove the tape prior to reinstalling the covers. Protective Tape
Apple LaserWriter 8500, Take Apart I/O Board - 29 I/O Board Before you begin, remove the following: • Fuser access cover • Left top cover • Left cover assembly • Front left cover 1 Make a note of the position of the reset button on the I/O bracket. 2 Disconnect the two cables at the right side the board. I/O Board with Shield I/O Board Cables Reset Button
Apple LaserWriter 8500, Overview SIMM Sizes and Speeds - 13 SIMM Sizes and Speeds Size Configuration Speed Connector type 4 MB SIMM 1 M X 32 bit (one 4 MB bank) 70 ns or less 72-pin 8 MB SIMM 2 M X 32 bit (two 4 MB banks) 70 ns or less 72-pin 16 MB SIMM* 4 M X 32 bit (one 16 MB bank) 70 ns or less 72-pin 32 MB SIMM* 8 M X 32 bit (two 16 MB banks) 70 ns or less 72-pin * Must have a 2 KB row (11 bit x 11 bit) refresh rate. 16 MB SIMMs with a 4 KB row (12 bit x 10 bit) refresh rate are not compatible
Apple LaserWriter 8500, Take Apart Separation Pad Assembly - 112 Separation Pad Assembly Before you begin, remove the following: • Fuser access cover • Right top cover • Right cover • Manual feed sensor assembly • Manual feed pickup rollers 1 Open the top cover and keep it open while you perform the steps below. Separation Pad
Apple LaserWriter 8500, Take Apart Top Cover - 20 Top Cover Before you begin, remove the following: • Fuser access cover • Left top cover • Right top cover • Exit cover 1 Open the top cover housing. Caution : Make sure you have placed a temporary support underneath the top cover as described in the left top cover and right top cover topics. Top Cover
Apple LaserWriter 8500, Take Apart Cassette Paper-Present Sensor - 68 Cassette Paper- Present Sensor Before you begin, remove the following: • Fuser access cover • Left top cover • Left cover assembly • Front left cover • Turn-in chute • I/O board 1 Swing the arm of the cassette paper-present actuator to the rear direction so that the actuator is away from the cassette paper- J205
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