Chapter contents ................................................................................................................................ 55
Basic operation ................................................................................................................................... 56
ADF/scanner system ......................................................................................................... 57
ADF ................................................................................................................... 57
Sensors in the ADF .......................................................................... 57
ADF paper path ................................................................................ 57
Scanner ............................................................................................................. 58
Formatter ........................................................................................................................... 59
Engine control unit (ECU) .................................................................................................. 60
Pickup/feed/delivery system .............................................................................................. 62
Laser/scanner system ........................................................................................................ 63
Image-formation system .................................................................................................... 64
Step 1: Primary charging ................................................................................... 65
Step 2: Laser beam exposure ........................................................................... 65
Step 3: Developing ............................................................................................ 65
Step 4: Transfer ................................................................................................ 66
Step 5: Separation ............................................................................................ 66
Step 6: Fusing ................................................................................................... 67
Step 7: Drum cleaning ....................................................................................... 67
Internal components ........................................................................................................................... 68
Timing ................................................................................................................................................. 69
Print cartridge memory system ........................................................................................................... 73
5 Removal and replacement
Chapter contents ................................................................................................................................ 75
Introduction ......................................................................................................................................... 77
Removal and replacement strategy .................................................................................. 77
Electrostatic discharge ....................................................................................................... 77
User-replaceable parts ...................................................................................................... 77
Required tools .................................................................................................................... 78
Before performing service .................................................................................................. 78
Parts removal order ........................................................................................................... 79
Automatic document feeder (ADF) and scanner assemblies ............................................................. 80
ADF assembly ................................................................................................................... 80
ADF cover ......................................................................................................... 80
ADF input tray ................................................................................................... 82
Control panel ..................................................................................................... 84
ADF ................................................................................................................... 87
Scanner assembly ............................................................................................................. 90
Covers ................................................................................................................................................ 94
Right-side cover ................................................................................................................. 94
Formatter shield ................................................................................................................. 95
Fax cover ........................................................................................................................... 96
Left-side cover ................................................................................................................... 97
Legal cover (dust cover) .................................................................................................. 100
Back cover ....................................................................................................................... 101
I/O cover .......................................................................................................................... 103
Fax rail ............................................................................................................................. 104
Top cover ......................................................................................................................... 105
Front, right cover .............................................................................................................. 109
ENWW v
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