Specifications

Electrophotography using single-component, dry-jumping development Semiconductor laser scanning mirror 300 dots per inch (dpi) (PLW 300 and 320) 600 dpi (LW 4 600 PS) PostScript Level 2 (PLW 320 and LW 4 600 PS) System Macintosh computer with system 6.0.7 or later PLW 320 AMD 29205 processor LW 4 600 PS AMD 29200 RISC processor 2 MB (expandable to 8 MB) PS 2 MB (expandable to 6 MB) PLW 300 Serial, externally clocked PLW 320 LocalTalk LW 4 600PS LocalTalk (EtherTalk and TokenTalk connectivity...

6 Mb Ram Expansion Card Laserwriter

Has the sealing tape been removed from the toner cartridge, and is the cartridge free from any other obstructions Remove the sealing tape or other obstructions from the toner cartridge. If the printer cover is removed, make sure you are pressing down on the toner cartridge during the printing process so that the toner cartridge is making solid contact with the HVT connector. Does the problem persist Are the metal contact points on the toner cartridge or HVT connector assembly dirty Clean the...

Transfer Roller Maintenance

Before you begin, remove the following You must eplace the transfer roller when it has been soiled by paper dust, when the toner cannot be removed, or when the roller is damaged. When handling the transfer roller, hold it only by the shaft, not the sponge area. If the transfer roller becomes dirty, clean it using dry, lint-free paper, which should produce virtually no paper dust. Caution Use dry paper only to clean the transfer roller. Never use solvents. Adjustments PLW 300 amp LW 4 600 PS

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If you are unable to print a service test page see Service Test Page , but the printer does cycle through its normal startup sequence the fan comes on and the delivery rollers rotate , you most likely have a problem with the controller assembly or pickup solenoid. Refer to the Take Apart chapter for instructions on how to replace the pickup solenoid and or controller assembly. Light Exposure Problems on Test Prints When the printer cover is removed, the photosensitive drum inside the toner...

Laserwriter 320 Power Switch

Laserwriter 600 Paper Feed

Total RAM to 4 MB. 4 MB of RAM is required to print edge to edge on legal size paper. total RAM to 4 MB. 4 MB of RAM is required to print edge to edge on legal size paper. The 6 MB RAM Expansion Card mates into J104 on the Personal LaserWriter 320 I O board to bring total RAM to 8 MB. 8 MB of RAM is required to print in PhotoGrade. The controller assembly controls the operation of the print engine. This assembly contains the high-voltage power supply, the four paper sensors, the printer fuses,...

Fixing Film Assembly

Before you begin, remove the following 1 Using needlenose pliers, release the springs on the left and right sides of the fuser left side shown . 2 Open the cable clamp on the left side of the fuser. Disconnect the two connectors on the left side of the fuser. 4 Disconnect the connector on the right side of the fuser. 5 Open the the top of the fuser. 6 Hold both ends of the fixing film assembly and carefully lift it out of the fuser.

Troubleshooting

The first part of this chapter contains quick-reference troubleshooting information for the Personal LaserWriter 300 320 and LaserWriter 4 600 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. The...

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. Make sure the toner cartridge is installed and then unplug the printer. Because of the possibility of a capacitor error, wait 4 minutes and then plug in the printer....