Fuser sleeve temperature protection .......................................................... 20 Failure detection .......................................................................................... 21 Fuser unit identification ............................................................................... 22 Fuser unit life detection ............................................................................... 22 Laser/scanner system .........................................................................................................................................
23 Laser/scanner failure ........................................................................................................................ 24 Protective-glass cleaners ................................................................................................................. 25 Image-formation system .................................................................................................................................... 26 Image formation process .................................................................................................................. 28 Step 1:
Pre-exposure ...................................................................................................... 29 Step 2: Primary charging ................................................................................................ 29 Step 3: Laser-beam exposure ........................................................................................ 30 Step 4: Development ...................................................................................................... 30 Step 5: Primary transfer ................................................................................................. 31 Step 6:
Secondary transfer ............................................................................................. 31 Step 7: Separation .......................................................................................................... 32 Step 8: Fusing .................................................................................................................. 32 Step 9: ITB cleaning ........................................................................................................ 33 Step 10: Drum cleaning ..................................................................................................
33 Toner cartridges ................................................................................................................................ 34 Memory tag ..................................................................................................................... 35 Developing unit engagement and disengagement control ........................................... 35 Intermediate transfer belt (ITB) unit ................................................................................................ 37 Primary transfer roller engagement and disengagement control ................................
37 ITB cleaning mechanism ................................................................................................. 40 Calibration ......................................................................................................................................... 40 Color-misregistration control ........................................................................................ 41 Image stabilization control ............................................................................................. 42 Pickup, feed, and delivery system ......................................................................................................................
43 Pickup-and-feed unit ........................................................................................................................ 48 Cassette pickup ............................................................................................................... 48 Cassette-presence detection ....................................................................... 49 Cassette lift operation and cassette paper-presence detection ................ 50 Cassette multiple-feed prevention .............................................................. 51 Multipurpose tray pickup ................................................................................................
51 Paper feed ....................................................................................................................... 52 Skew-feed prevention .................................................................................. 54 Paper detection ............................................................................................ 55 Feed speed control ....................................................................................... 55 Fusing and delivery block .................................................................................................................
56 Loop control .................................................................................................................... 57 vi ENWW