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