HP Printer Utility features ................................................................................... 57
4 Theory of operation
Chapter contents ................................................................................................................................. 59
Basic operation .................................................................................................................................... 60
Stapler ................................................................................................................................. 61
ADF/scanner system ........................................................................................................... 61
ADF .................................................................................................................... 61
Sensors in the ADF ........................................................................... 61
ADF paper path ................................................................................. 61
ADF paper-size detection .................................................................. 63
Legal paper-size detection for flatbed ............................................... 63
ADF skew .......................................................................................... 64
Scanner .............................................................................................................. 65
Formatter ............................................................................................................................. 67
Engine control unit (ECU) ................................................................................................... 68
Pickup/feed/delivery system ............................................................................................... 70
Pickup and feed components ............................................................................. 70
Pick-up/feed/delivery blocks .............................................................................. 70
Pick-up/feed unit ................................................................................ 72
Fixing/delivery unit ............................................................................. 74
Duplex feed unit ................................................................................. 75
Optional tray 3 paper path ................................................................. 76
Media-width detection ........................................................................................ 78
Jam detection ..................................................................................................... 79
Laser/scanner system ......................................................................................................... 82
Image-formation system ..................................................................................................... 83
Step 1: Primary charging .................................................................................... 84
Step 2: Laser beam exposure ............................................................................ 84
Step 3: Developing ............................................................................................. 84
Step 4: Transfer ................................................................................................. 85
Step 5: Separation ............................................................................................. 85
Step 6: Fusing .................................................................................................... 86
Step 7: Drum cleaning ........................................................................................ 86
Internal components ............................................................................................................................ 87
Timing .................................................................................................................................................. 88
Print cartridge memory system ............................................................................................................ 92
Electrical structure ............................................................................................................................... 93
5 Removal and replacement
Chapter contents ................................................................................................................................. 95
Introduction ..................................................................................................................
........................ 97
Removal and replacement strategy .................................................................................... 97
Electrostatic discharge ........................................................................................................ 97
User-replaceable parts ....................................................................................................... 97
Required tools ..................................................................................................................... 98
Before performing service ................................................................................................... 98
Parts removal order ............................................................................................................ 99
Automatic document feeder (ADF) and scanner assemblies ............................................................ 100
ADF assembly ................................................................................................................... 100
ENWW v
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