Cassette paper-size and cassette-presence detection ..................... 71
Cassette lift operation ....................................................................... 74
Cassette paper-level and paper-presence detection ........................ 75
Multifeed prevention ......................................................................... 76
Multipurpose tray pickup ................................................................................... 76
Multipurpose tray last-paper detection ............................................. 77
Paper feed ......................................................................................................... 78
Skew-feed prevention ....................................................................... 80
Paper-type detection ........................................................................ 80
Feed-speed control ........................................................................... 81
Media width detection ....................................................................................... 82
Fusing and delivery unit ..................................................................................................... 83
Loop control ...................................................................................................... 83
Fuser depressurize control ................................................................................ 85
Duplexing unit .................................................................................................................... 87
Duplexing reverse and feed control .................................................................. 88
Jam detection .................................................................................................................... 89
1x500-sheet paper feeder (M855 only) and 3x500-sheet paper feeder ............................................. 92
1x500- and 3x500-sheet paper-feeder cassette media-size detection and cassette-
presence detection ............................................................................................................ 92
Paper feeder electrical components .................................................................................. 94
Paper-feeder pickup-and-feed operation ........................................................................... 97
Paper feeder jam detection ................................................................................................ 98
3,500-sheet high-capacity input (HCI) feeder ................................................................................... 101
HCI electrical components ............................................................................................... 102
HCI motor control ............................................................................................................. 103
HCI motor failure detection ............................................................................. 104
HCI pickup-and-feed operation ........................................................................................ 105
HCI electrical components .............................................................................. 105
HCI lift-up operation ........................................................................................ 107
HCI cassette media-size detection and cassette-presence detection ............. 107
HCI jam detection ............................................................................................................ 108
Intermediate paper transportation unit ............................................................................................. 110
IPTU electrical components ............................................................................................. 110
IPTU motor control ........................................................................................................... 111
Feed operation ................................................................................................ 111
IPTU motor failure detection ........................................................................... 112
IPTU fan control ............................................................................................................... 112
IPTU fan failure detection ................................................................................ 112
IPTU jam detection .......................................................................................................... 113
Stapler/stacker and stapler/stacker with hole punch ........................................................................ 114
ENWW vii
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