Drum cleaning stage ....................................................................................................... 18 Step 7: Fusing ............................................................................................... 17 Step 8: Drum cleaning .................................................................................. 18 ITB cleaning mechanism ................................................................................................. 18 Pickup, feed, and delivery system ......................................................................................................................
20 Main-input tray .................................................................................................................................................... 22 Photo sensors and switches ............................................................................................................. 21 Jam detection .................................................................................................................................... 22 Scanner system ...................................................................................................................................................
23 Electrical system ............................................................................................................................... 23 Scanner power-on sequence of events .......................................................................... 23 Copy or scan-to-computer sequence of events ............................................................. 24 Document feeder functions and operation ......................................................................................................... 25 Document feeder operation ..............................................................................................................
25 Document feeder paper path and document feeder sensors .......................................................... 25 Fax functions and operation ............................................................................................................................... 27 Document feeder jam detection ....................................................................................................... 26 Computer and network security features ........................................................................................ 27 PSTN operation .................................................................................................................................
27 The fax subsystem ............................................................................................................................ 27 Fax card in the fax subsystem .......................................................................................................... 27 Safety isolation ............................................................................................................... 28 Safety-protection circuitry ............................................................................................. 28 Data path .........................................................................................................................
28 Hook state ....................................................................................................................... 28 Downstream device detection ........................................................................................ 29 Hook switch control ........................................................................................................ 29 Ring detect ...................................................................................................................... 29 Line current control ........................................................................................................
29 Billing- (metering-) tone filters ...................................................................................... 29 Fax page storage in flash memory ................................................................................................... 29 Stored fax pages ............................................................................................................. 30 Advantages of flash memory storage ............................................................................ 30 2 Solve problems ...........................................................................................................................................
31 Solve problems checklist ..................................................................................................................................... 32 Step 1: Test print functionality ......................................................................................................... 32 Step 2: Test copy functionality ......................................................................................................... 32 Menu map ............................................................................................................................................................
33 Troubleshooting processes ................................................................................................................................. 34 Determine the problem source ......................................................................................................... 34 vi ENWW