HP — HP Color Laserjet CP4020, CP4520 (service manual (EN)

Envelopes jam or will not feed in the product .................................................................. 405 Output is curled or wrinkled ............................................................................................. 406 Product will not duplex or duplexes incorrectly ................................................................ 406 Use manual print modes .................................................................................................................. 408 Solve image-quality problems ..........................................................................................................

410 Image defects table ......................................................................................................... 410 Clean the product ............................................................................................................................. 416 Clean the paper path ....................................................................................................... 416 Solve performance problems ........................................................................................................... 417 Solve connectivity problems .............................................................................................................

418 Solve direct-connect problems ........................................................................................ 418 Solve network problems .................................................................................................. 418 Service mode functions .................................................................................................................... 420 Service menu ................................................................................................................... 420 Product resets ..................................................................................................................

423 Restore factory-set defaults ............................................................................ 423 Hard disk initialization (optional) ..................................................................... 423 NVRAM initialization ........................................................................................ 423 Product cold reset .......................................................................................... 424 Product updates ...............................................................................................................................

424 4 Parts and diagrams Order parts, accessories, and supplies ............................................................................................ 426 Part numbers .................................................................................................................................... 427 Accessories ..................................................................................................................... 427 Print cartridges and toner collection unit .......................................................................... 427 Memory ............................................................................................................................

427 Cables and interfaces ...................................................................................................... 427 Customer self repair (CSR) parts .................................................................................... 428 Service maintenance kits ................................................................................................. 428 Unique components ......................................................................................................... 429 Screws ..............................................................................................................................................

430 How to use the parts lists and diagrams .......................................................................................... 431 External covers, panels, and doors .................................................................................................. 432 Right door assembly ......................................................................................................................... 434 Front door assembly .........................................................................................................................

436 Internal components ......................................................................................................................... 438 Internal components (1 of 7) ............................................................................................ 438 Internal components (2 of 7) ............................................................................................ 440 Internal components (3 of 7) ............................................................................................ 442 Internal components (4 of 7) ............................................................................................

444 Internal components (5 of 7) ............................................................................................ 446 Internal components (6 of 7) ............................................................................................ 448 ENWW xiii