Step 6: Secondary transfer ............................................................................... 26 Step 7: Separation ............................................................................................ 27 Step 8: Fusing ................................................................................................... 27 Step 9: ITB cleaning .......................................................................................... 28 Step 10: Drum cleaning .....................................................................................
28 Print cartridge .................................................................................................................... 28 Developing-roller engagement and disengagement .......................................................... 30 Intermediate transfer belt (ITB) unit ................................................................................... 31 Primary-transfer-roller engagement and disengagement .................................. 32 ITB cleaning ......................................................................................................
34 Calibration .......................................................................................................................... 34 Color-misregistration control ............................................................................. 35 Image-stabilization control ................................................................................ 35 Pickup, feed, and delivery system ...................................................................................................... 37 Pickup-and-feed unit ..........................................................................................................
41 Cassette pickup ................................................................................................. 41 Cassette-presence detection ............................................................ 42 Cassette lift operation and cassette paper-presence detection ........ 43 Cassette multiple-feed prevention .................................................... 43 Multipurpose tray pickup ................................................................................... 44 Paper feed ......................................................................................................... 45 Skew-feed prevention .......................................................................
46 Paper detection ................................................................................ 47 Feed speed control ........................................................................... 48 Fusing and delivery unit ..................................................................................................... 48 Loop control ...................................................................................................... 49 Pressure-roller pressurization control ...............................................................
50 Duplexing unit (HP Color LaserJet CP4525dn, HP Color LaserJet CP4025dn, and HP Color LaserJet CP4525xh only) ......................................................................................... 52 Duplexing reverse and feed control .................................................................. 52 Duplex print operation ....................................................................................... 53 Jam detection .....................................................................................................................................
55 Optional paper feeder ......................................................................................................................... 57 Motor control ...................................................................................................................... 59 Paper-feeder pickup and feed operation ........................................................................... 60 Paper-size detection and cassette-presence detection ..................................................... 62 Paper-feeder cassette lift operation ...................................................................................
63 Paper feeder jam detection ................................................................................................ 64 2 Removal and replacement Introduction ......................................................................................................................................... 68 Removal and replacement strategy ................................................................................................... 68 Electrostatic discharge .......................................................................................................................
69 Required tools ................................................................................................................................... 69 vi ENWW