Step 7: Fusing ............................................................................................... 17
Drum cleaning stage ....................................................................................................... 18
Step 8: Drum cleaning .................................................................................. 18
ITB cleaning mechanism ................................................................................................. 18
Pickup, feed, and delivery system ...................................................................................................................... 20
Photo sensors and switches ............................................................................................................. 21
Main-input tray .................................................................................................................................................... 22
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
Document feeder jam detection ....................................................................................................... 26
Fax functions and operation ............................................................................................................................... 27
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
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