Table of contents
1 Theory of operation .......................................................................................................... 1
Basic operation ........................................................................................................................ 2
Sequence of operation ............................................................................................... 4
Engine-control system ................................................................................................................ 5
DC controller ............................................................................................................ 6
Solenoids .................................................................................................. 6
Clutches .................................................................................................... 7
Switches ................................................................................................... 7
Sensors ..................................................................................................... 8
Motors ...................................................................................................... 9
Fans ...................................................................................................................... 10
High-voltage power supply ....................................................................................... 12
Low-voltage power supply ........................................................................................ 14
Overcurrent/overvoltage protection ............................................................ 15
Safety ..................................................................................................... 15
Voltage detection ..................................................................................... 15
Sleep (powersave) mode ........................................................................... 15
Low-voltage power supply failure ............................................................... 16
Fuser control ........................................................................................................... 16
Fuser temperature control .......................................................................... 17
Fuser sleeve temperature protection ............................................................ 17
Failure detection ...................................................................................... 19
Fuser unit identification ............................................................................. 19
Fuser unit life detection ............................................................................. 20
Laser/scanner system ............................................................................................................. 21
Laser/scanner failure ............................................................................................... 22
Protective-glass cleaners ........................................................................................... 22
Image-formation system ........................................................................................................... 24
Image-formation process .......................................................................................... 26
Step 1: Pre-exposure ................................................................................. 27
Step 2: Primary charging .......................................................................... 27
Step 3: Laser-beam exposure ..................................................................... 28
ENWW v
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