HP LASERJET ENTERPRISE M775dn - Page 8

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
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