Laser failure detection .............................................................................................. 24 Image-formation system ........................................................................................................... 25 Electrophotographic process ..................................................................................... 25 Image formation process .......................................................................................... 27 Latent-image formation block ..................................................................... 28 Pre-exposure .............................................................................
28 Primary charging ...................................................................... 28 Laser beam exposure ................................................................. 29 Developing block ..................................................................................... 30 Transfer block .......................................................................................... 31 Primary transfer ......................................................................... 31 Secondary transfer .................................................................... 31 Separation ...............................................................................
32 Fusing block ............................................................................................ 32 ITB cleaning block .................................................................................... 33 Drum cleaning block ................................................................................. 33 Toner cartridges ...................................................................................................... 34 Memory tag ............................................................................................ 35 Cartridge presence detection .....................................................................
35 Toner level detection ................................................................................. 35 Cartridge life detection ............................................................................. 35 Developing unit engagement and disengagement control .............................. 35 ITB unit .................................................................................................................. 37 Primary transfer roller engagement and disengagement control ...................... 38 ITB unit presence detection ........................................................................
39 ITB life detection ....................................................................................... 39 ITB cleaning mechanism ............................................................................ 40 Calibration ............................................................................................................. 41 Color-misregistration control ...................................................................... 41 Environment change control ....................................................................... 42 Image stabilization control ........................................................................
42 Image density control (DMAX) ..................................................... 42 Image halftone control (DHALF) ................................................... 43 Pickup, feed, and delivery system ............................................................................................. 44 Photo sensors .......................................................................................................... 45 Motors and solenoids .............................................................................................. 46 Pickup and feed block .............................................................................................
47 Tray 2 cassette pickup .............................................................................. 47 Tray 2 cassette multiple-feed prevention ...................................................... 48 Tray 2 cassette media-size detection and Tray 2 cassette-presence detection ... 50 Tray 2 cassette lift-up operation .................................................................. 51 vi ENWW