Image-formation system .................................................................................................................................... 24 Electrophotographic process ............................................................................................................ 24 Image formation process .................................................................................................................. 26 Latent-image formation stage ....................................................................................... 27 Primary charging ..........................................................................................
27 Developing stage ............................................................................................................ 28 Laser beam exposure ................................................................................... 27 Print cartridge ............................................................................................... 28 Transfer stage ................................................................................................................. 29 Fusing stage .................................................................................................
29 Pickup, feed, and delivery system ...................................................................................................................... 31 Cleaning stage .............................................................................................. 30 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 vi ENWW