Photo sensors and switches ............................................................................................................. 51
Motors, clutches, and solenoids ........................................................................................................ 53
Tray 1 (multipurpose)/Tray 2 (base printer) ..................................................................................... 54
Tray 1 paper pickup and feed ......................................................................................... 54
Tray 2 paper presence detection .................................................................................... 55
Tray 2 lift operation ........................................................................................................ 55
Tray 2 paper pickup ......................................................................................................... 56
Tray 2 multiple-feed prevention ..................................................................................... 56
Tray 2 presence detection .............................................................................................. 57
Tray 2 skew feed prevention ........................................................................................... 57
Tray 2 media type detection ........................................................................................... 58
Feed speed control .......................................................................................................... 59
Duplexing unit (M552dn, M553dn, M553x, and M577 only) ............................................................ 60
Duplexing reverse and duplex feed control ................................................................... 60
Jam detection/prevention ................................................................................................................. 60
Fuser wrapping jam detection ........................................................................................ 62
Loop control .................................................................................................. 62
Pressure roller pressurization and depressurization control ...................... 63
Input accessories ................................................................................................................................................. 65
Trays 3-5 ........................................................................................................................................... 65
Trays 3-5 driver PCA ....................................................................................................... 65
Trays 3-5 motor control .................................................................................................. 66
Trays 3-5 electrical components .................................................................................... 66
Trays 3-5 paper pickup ................................................................................................... 67
Trays 3-5 multiple feed prevention ................................................................................ 67
Trays 3-5 tray presence detection .................................................................................. 67
Trays 3-5 tray lift operation ........................................................................................... 68
Trays 3-5 jam detection .................................................................................................. 69
Scanning and image capture system (M577) ...................................................................................................... 70
Document feeder system (M577) ........................................................................................................................ 71
Document feed system ..................................................................................................................... 71
Sensors in the document feeder ....................................................................................................... 71
Document feeder paper path ............................................................................................................ 72
Document feeder simplex operation ................................................................................................ 73
Document feeder e-duplex operation .............................................................................................. 74
Deskew operation .............................................................................................................................. 74
Document feeder hinges ................................................................................................................... 75
2 Solve problems ............................................................................................................................................ 77
For additional service and support ..................................................................................................................... 78
Solve problems checklist ..................................................................................................................................... 79
ENWW ix
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