Pre-troubleshooting checklist .......................................................................... 373
Troubleshooting flowchart ............................................................................... 375
Power subsystem ............................................................................................................ 376
Power-on checks ............................................................................................. 376
Power-on troubleshooting overview ............................................... 376
Tools for troubleshooting .................................................................................................................. 378
Individual component diagnostics .................................................................................... 378
LED diagnostics .............................................................................................. 378
Understand lights on the formatter ................................................. 378
Engine diagnostics .......................................................................................... 381
Troubleshooting menu .................................................................... 381
Defeating interlocks ........................................................................ 384
Disable cartridge check .................................................................. 385
Engine-test button .......................................................................... 386
Paper-path test ................................................................................................ 386
Manual sensor test (special-mode test) .......................................................... 387
A TOP (top of page) sensor ............................................................ 389
B and C loop sensors ..................................................................... 390
D fuser (fixing) delivery sensor ....................................................... 391
E duplex re-pickup sensor .............................................................. 392
F output bin full sensor ................................................................... 393
G developing home-position sensor .............................................. 394
H fuser (fixing) pressure-release sensor ....................................... 395
I primary transfer-roller disengagement sensor .............................. 396
K right and front door interlock switches ......................................... 398
L Tray 1 media present sensor ...................................................... 400
M Tray 2 paper out sensor ............................................................. 401
N Tray 2 closed sensor ................................................................... 402
O Tray 2 stack-surface sensor ...................................................... 403
P optional Tray 3-empty sensor ...................................................... 404
Q optional Tray 3 media-feed sensor (Q) ....................................... 405
R optional Tray 3 stack-surface sensor (R) .................................... 406
S, T, and U optional Tray 3 media-size sensors ............................ 407
Paper-path sensors test .................................................................................. 408
Print/Stop test .................................................................................................. 409
Component tests ............................................................................................. 409
Component test (special mode test) ............................................... 409
Diagrams ......................................................................................................................... 411
Formatter PCA ................................................................................................ 411
Location of connectors .................................................................................... 412
DC controller PCA .......................................................................... 412
Paper feeder driver PCA ................................................................ 413
PCAs, motors, fans, switches, solenoids, and clutches .................................. 414
Base product .................................................................................. 414
ENWW xi
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