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Understand lights on the formatter .................................................................. 494
HP Jetdirect LEDs .......................................................................... 494
Heartbeat LED ................................................................................ 495
Engine-test button ............................................................................................................ 495
Diagnostics menu ............................................................................................................ 496
Diagnostics mode ............................................................................................................ 496
Diagnostics that put the engine into the special diagnostics mode ................................. 497
Diagnostic tests ............................................................................................................... 497
Disable cartridge check ................................................................................................... 498
Paper-path sensors test ................................................................................................... 499
Paper-path test ................................................................................................................ 501
Manual sensor test (special-mode test) ........................................................................... 501
Manual sensor test 2 (special-mode test) ........................................................................ 502
Component tests .............................................................................................................. 503
Component test (special-mode test) ............................................................... 503
Print/stop test ................................................................................................................... 507
Color-band test ................................................................................................................ 507
Service mode functions .................................................................................................................... 508
Service menu ................................................................................................................... 508
Product resets .................................................................................................................. 509
Restore factory-set defaults ............................................................................ 509
Hard disk initialization ..................................................................................... 510
NVRAM initialization ........................................................................................ 510
Diagrams .......................................................................................................................................... 511
Connectors ...................................................................................................................... 511
DC controller PCA ........................................................................................... 511
PCAs ............................................................................................................... 511
Product base ................................................................................................... 514
1 x 500-sheet input tray ................................................................................... 517
3 x 500-sheet input tray ................................................................................... 517
IPTU ................................................................................................................ 518
Sensors ............................................................................................................................ 518
Sensors ........................................................................................................... 518
Product base ................................................................................................... 520
1 x 500-sheet input tray ................................................................................... 522
3 x 500-sheet input tray ................................................................................... 523
IPTU ................................................................................................................ 524
Fans ................................................................................................................................. 525
Fans ................................................................................................................ 525
Product base ................................................................................................... 526
Motors .............................................................................................................................. 526
Motors ............................................................................................................. 526
Product base ................................................................................................... 528
1 x 500-sheet input tray ................................................................................... 529
ENWW xiii