HP LaserJet Pro M201n - Page 8

Image-formation system .................................................................................................................................... 24
Electrophotographic process ............................................................................................................ 24
Image formation process .................................................................................................................. 26
Latent-image formation stage ....................................................................................... 27
Primary charging .......................................................................................... 27
Laser beam exposure ................................................................................... 27
Developing stage ............................................................................................................ 28
Print cartridge ............................................................................................... 28
Transfer stage ................................................................................................................. 29
Fusing stage ................................................................................................. 29
Cleaning stage .............................................................................................. 30
Pickup, feed, and delivery system ...................................................................................................................... 31
Photo sensors and switches ............................................................................................................. 32
Multiple-feed prevention .................................................................................................................. 34
Jam detection .................................................................................................................................... 34
Scanning and image capture system .................................................................................................................. 36
Scanner power-on sequence of events ............................................................................................ 36
Copy or scan sequence of events ...................................................................................................... 37
Scanner operation ............................................................................................................................. 38
ADF operation ...................................................................................................................................................... 39
ADF paper path and ADF sensors ...................................................................................................... 39
ADF jam detection ............................................................................................................................. 40
Fax functions and operation ............................................................................................................................... 42
Computer and network security features ........................................................................................ 42
PSTN operation ................................................................................................................................. 42
Receive faxes when you hear fax tones ........................................................................................... 42
Distinctive ring function .................................................................................................................... 43
Fax by using Voice over IP services ................................................................................................... 43
The fax subsystem ............................................................................................................................ 44
Fax card in the fax subsystem .......................................................................................................... 44
Safety isolation ............................................................................................................... 44
Safety-protection circuitry ............................................................................................. 44
Data path ......................................................................................................................... 44
Hook state ....................................................................................................................... 45
Downstream current detection ...................................................................................... 45
Hook switch control ........................................................................................................ 45
Ring detect ...................................................................................................................... 45
Line current control ........................................................................................................ 45
Billing- (metering-) tone filters ...................................................................................... 46
Fax page storage in flash memory ................................................................................................... 46
Stored fax pages ............................................................................................................. 46
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