Drum drive motors (Y/C/M/K) ........................................................................................... 298
Power supply fan/shroud (Fan 4) ..................................................................................... 299
Delivery fan/shroud (Fan 3) .............................................................................................. 300
Cartridge fan/shroud (Fan 2) ............................................................................................ 302
Upper exhaust fan (Fan 1) ................................................................................................ 305
Sensors and switches ........................................................................................................................ 308
Environment sensor .......................................................................................................... 308
Power switch assembly .................................................................................................... 309
PCBs .................................................................................................................................................. 312
DC controller PCB ............................................................................................................. 312
Low-voltage power supply PCB ........................................................................................ 319
Memory controller PCB ..................................................................................................... 321
E label memory contacts and cable .................................................................................. 322
High-voltage power supply PCB ....................................................................................... 324
Toner level detection PCB ................................................................................................ 326
High-voltage contacts ....................................................................................................... 326
500-sheet paper feeder ..................................................................................................................... 328
500-sheet paper feeder right cover .................................................................................. 329
500-sheet paper feeder rear cover ................................................................................... 329
500-sheet paper feeder left cover ..................................................................................... 330
500-sheet paper feeder front cover .................................................................................. 331
500-sheet paper pickup drive assembly ........................................................................... 333
500-sheet paper feeder lifter drive assembly ................................................................... 337
500-sheet paper feeder pickup rollers .............................................................................. 339
Stapler/stacker (4700 models) .......................................................................................................... 340
Remove the stapler/stacker from the printer .................................................................... 340
Staple cartridge left cover ................................................................................................. 341
Output tray ........................................................................................................................ 341
Left cover .......................................................................................................................... 342
Top cover .......................................................................................................................... 342
Right cover ........................................................................................................................ 344
Staple cartridge ................................................................................................................. 346
Stapler/stacker PCB .......................................................................................................... 347
Stapler/stacker unit assembly 24v 2.5 amp ...................................................................... 348
Duplexer ............................................................................................................................................ 349
Top duplexing assembly ................................................................................................... 349
Duplex tray ........................................................................................................................ 349
7 Troubleshooting
Introduction ........................................................................................................................................ 352
Troubleshooting process ................................................................................................................... 354
Pre-troubleshooting checklist ............................................................................................ 354
Troubleshooting checklist ................................................................................................. 355
Troubleshooting flowchart ................................................................................................. 356
Power-on checks .............................................................................................................. 357
Power-on troubleshooting overview ................................................................. 357
Control panel messages .................................................................................................................... 359
Warning messages ........................................................................................................... 359
Error messages ................................................................................................................. 359
Critical error messages ..................................................................................................... 359
ENWW xi
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