Table of contents
1 Theory of operation .......................................................................................................... 1
Basic operation ........................................................................................................................ 2
Sequence of operation ............................................................................................... 3
Engine-control system ................................................................................................................ 4
DC controller ............................................................................................................ 5
Solenoids .................................................................................................. 5
Clutches .................................................................................................... 6
Switches ................................................................................................... 6
Sensors ..................................................................................................... 7
Motors and fans ......................................................................................... 8
High-voltage power supply ......................................................................................... 9
Low-voltage power supply ........................................................................................ 11
Overcurrent/overvoltage protection ............................................................ 12
Safety ..................................................................................................... 13
Voltage detection ..................................................................................... 13
Sleep (powersave) mode ........................................................................... 13
Power supply voltage detection .................................................................. 14
Low-voltage power supply failure ............................................................... 14
Power Off condition ................................................................................................ 14
Auto on/Auto off mode ............................................................................................ 14
Fuser (fixing) control ................................................................................................ 16
Fuser (fixing) temperature-control circuit ...................................................... 17
Fuser (fixing) over-temperature protection .................................................... 17
Fuser (fixing)-failure detection .................................................................... 18
Laser/scanner system ............................................................................................................. 20
Image formation system .......................................................................................................... 22
Image formation process .......................................................................................... 23
Step 1: Pre-exposure ................................................................................. 24
Step 2: Primary charging .......................................................................... 24
Step 3: Laser-beam exposure ..................................................................... 25
Step 4: Development ................................................................................ 25
Step 5: Primary transfer ............................................................................ 26
ENWW v
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