Pre-troubleshooting checklist .................................................................... 367
Troubleshooting flowchart ....................................................................... 369
Power subsystem ................................................................................................... 370
Power-on checks .................................................................................... 370
Power-on troubleshooting overview ............................................ 370
Control-panel checks ............................................................................................. 372
Scanning subsystem .............................................................................................. 373
Tools for troubleshooting ....................................................................................................... 374
Component diagnostics .......................................................................................... 374
LED diagnostics ...................................................................................... 374
LED indicators ......................................................................... 374
Engine diagnostics ................................................................................. 375
Defeating interlocks ................................................................. 375
Disable cartridge check ........................................................... 376
Engine-test button .................................................................... 376
Paper-path test ....................................................................................... 378
Manual sensor test ................................................................................. 378
Front-door switch ..................................................................... 380
Right-door switch ..................................................................... 381
Registration sensor .................................................................. 382
Fuser loop 1 and 2 sensors ...................................................... 383
Fuser output sensor .................................................................. 384
Duplexer refeed sensor ............................................................ 386
IPTU-bin-full sensor ................................................................... 387
Developer alienation sensor ...................................................... 388
Fuser pressure-release sensor .................................................... 389
ITB alienation sensor ................................................................ 390
IPTU feed sensor ..................................................................... 392
Scanner open sensor ............................................................... 392
Tray/Bin manual sensor test .................................................................... 393
Tray 1 paper sensor ................................................................ 395
Tray 2 paper sensor ................................................................ 396
Tray 2 paper surface 1 and 2 sensors ....................................... 397
Tray 2 paper size switches ....................................................... 398
Tray 3 paper sensor ................................................................ 399
Tray 3 feed sensor ................................................................... 399
Tray 3 paper surface 1 and 2 sensors ....................................... 400
Tray 3 paper size switches ....................................................... 401
Tray 4 paper sensor ................................................................ 401
Tray 4 feed sensor ................................................................... 402
Tray 4 paper surface 1 and 2 sensors ....................................... 402
xiv ENWW
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