HP LASERJET ENTERPRISE M855 - Page 8

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 cartridge .................................................................................................................. 34
Imaging drum ..................................................................................................................... 36
Developing roller engagement and disengagement .......................................... 38
Intermediate transfer belt (ITB) unit ................................................................................... 39
Primary-transfer roller engagement and disengagement .................................. 40
ITB unit detection .............................................................................................. 42
Secondary-transfer roller unit ............................................................................................ 43
Calibration .......................................................................................................................... 44
Calibration overview .......................................................................................... 45
Color-misregistration control ............................................................................. 46
Image stabilization control ................................................................................. 46
Color sensor and color-sensor sensor control (M855 only) ............................................... 48
Gray-axis correction .......................................................................................... 49
Scanning/image capture system ........................................................................................................ 50
Scanner ............................................................................................................................. 50
Document feeder system ................................................................................................... 51
Document feeder sensors ................................................................................. 52
Document feeder simplex operation ................................................................. 53
Document feeder duplex operation ................................................................... 55
Document feeder paper control and deskew .................................................... 57
Document feeder paper pick and separation .................................................... 58
Document feeder paper stopper and fins .......................................................... 59
Document feeder simplex selector .................................................................... 60
Document feeder white backing ........................................................................ 60
Document feeder duplex selector ..................................................................... 61
Document feeder hinge ..................................................................................... 63
Pickup, feed, and delivery system ...................................................................................................... 65
Photo sensors and switches .............................................................................................. 65
Motors and solenoids ......................................................................................................... 68
Pickup-and-feed system .................................................................................................... 70
Cassette pickup ................................................................................................. 71
vi ENWW