Table of contents
1 Theory of operation .......................................................................................................... 1
Basic operation ........................................................................................................................ 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 .................................................................................................... 11
Fans ....................................................................................................... 13
Fuser-control circuit ................................................................................... 14
Fuser temperature control ........................................................... 15
Fuser protective function ............................................................. 16
Fuser failure detection ................................................................ 17
Fuser installation protection ........................................................ 17
Fuser presence detection ............................................................ 17
Fuser life detection .................................................................... 17
Low-voltage power supply ......................................................................... 18
Power-outage recovery circuit ..................................................... 19
Sleep mode operation ............................................................... 19
Automatic damp paper detection ................................................ 19
Overcurrent/overvoltage protection ............................................. 20
High-voltage power supply ........................................................................ 21
Laser/scanner system ............................................................................................................. 23
ENWW v
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