HP LaserJet Enterprise M4555 - Page 8

Sleep mode ............................................................................................. 18
Power supply detection ............................................................................. 18
Image-formation system ........................................................................................................... 19
Print cartridge ......................................................................................................... 21
Memory tag ............................................................................................ 21
Cartridge-presence detection ..................................................................... 21
Toner detection ........................................................................................ 22
Electrophotographic process ..................................................................................... 22
1. Primary charge (conditioning) ................................................................ 22
2. Laser-beam exposure (writing) ................................................................ 23
3. Developing .......................................................................................... 23
4. Transfer .............................................................................................. 24
5. Separation .......................................................................................... 25
6. Fusing ................................................................................................. 25
7. Drum cleaning ..................................................................................... 26
Laser/scanner system .............................................................................................. 26
Laser/scanner assembly failure detection .................................................... 28
Safety ..................................................................................................... 28
Pickup, feed, and delivery system ............................................................................................. 29
Pickup-and-feed block .............................................................................................. 33
Cassette pickup ........................................................................................ 34
Cassette media-size detection and cassette-present detection ......................... 35
Cassette lift-up operation ............................................................ 36
Cassette media-presence detection .............................................. 36
Multifeed prevention .................................................................. 37
Tray 1 pickup .......................................................................................... 38
Tray 1 media-presence detection ................................................. 39
Fusing-switchback and delivery block ........................................................................ 43
Fusing ..................................................................................................... 43
Pressure roller pressurization and depressurization control ............................ 44
Switchback and delivery control ................................................................. 45
Face-down delivery ................................................................... 46
Face-up delivery ........................................................................ 47
Output bin media-full detection ................................................... 48
Duplex block ............................................................................ 49
Duplex side registration adjustment operation ............................... 49
Jam detection ......................................................................................................... 52
No pick jam 1 ......................................................................................... 53
No pick jam 2 ......................................................................................... 54
No pick jam 3 ......................................................................................... 54
Feed stay jam .......................................................................................... 54
vi ENWW