Tray 1 solenoid ........................................................................................ 34 Duplex solenoid ....................................................................................... 35 Motors and fans ...................................................................................................... 37 Main motor ............................................................................................. 37 Printed circuit-board assemblies (PCAs) ...................................................................... 41 Fan ........................................................................................................
39 Engine controller assembly (DC controller) PCA ............................................ 41 Universal serial bus (USB) PCA .................................................................. 46 Formatter PCA ......................................................................................... 48 Wireless PCA .......................................................................................... 48 Power switch PCA .................................................................................... 49 Connecting PCA ......................................................................................
51 Miscellaneous parts ................................................................................................. 52 Transfer roller .......................................................................................... 52 Optional paper feeder (Tray 3) ................................................................................. 53 Multipurpose (MP) tray pickup gear assembly .............................................. 52 Optional paper feeder right cover .............................................................. 54 Optional paper feeder driver PCA ..............................................................
54 Optional paper feeder paper sensor PCA ................................................... 55 2 Parts and diagrams ........................................................................................................ 59 Order parts by authorized service providers .............................................................................. 60 Order replacement parts .......................................................................................... 60 Related documentation and software ......................................................................... 60 Supplies part numbers .............................................................................................
60 How to use the parts lists and diagrams .................................................................................... 62 Whole-unit replacement part numbers ........................................................................ 60 Assembly locations ................................................................................................................. 63 HP LaserJet M401a, M401n, M401d models ............................................................. 63 HP LaserJet M401dn and M401dw models ................................................................
64 Covers, panels, and doors ...................................................................................................... 66 Optional paper feeder ............................................................................................. 65 Internal assemblies ................................................................................................................. 70 Input devices ......................................................................................................................... 82 500-sheet paper feeder ...........................................................................................
82 Paper feeder covers .................................................................................. 82 Paper feeder main body (1 of 2) ................................................................ 84 Paper feeder main body (2 of 2) ................................................................ 86 Alphabetical parts list ............................................................................................................. 88 Numerical parts list ................................................................................................................ 93 vi ENWW