1 Theory of operation .......................................................................................................... 1
Basic operation ........................................................................................................................ 2
Major product systems ............................................................................................... 2
Product block diagram ............................................................................................... 2
Sequence of operation ............................................................................................... 3
Normal sequence of operation ..................................................................... 3
Formatter-control system ............................................................................................................ 5
Sleep mode .............................................................................................................. 5
Input/output ............................................................................................................. 6
CPU ........................................................................................................................ 6
Memory ................................................................................................................... 6
Firmware ................................................................................................... 6
Nonvolatile memory ................................................................................... 6
PJL overview ............................................................................................................. 6
PML ......................................................................................................................... 7
Control panel ........................................................................................................... 7
Engine-control system ................................................................................................................ 8
DC controller ............................................................................................................ 9
Motors .................................................................................................... 12
Fans ....................................................................................................... 14
Fuser-control circuit ................................................................................... 15
Fuser temperature control ........................................................... 16
Fuser protective function ............................................................. 17
Fuser failure detection ................................................................ 18
Low-voltage power supply ......................................................................... 19
Overcurrent/overvoltage protection ............................................. 21
High-voltage power supply ........................................................................ 22
Laser scanner system ............................................................................................... 24
Laser failure detection ............................................................................... 25
Image-formation system ........................................................................................................... 26
Electrophotographic process ..................................................................................... 26
Image formation process .......................................................................................... 28
ENWW v
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