Table of contents 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 PJL overview ............................................................................................................. 6 Nonvolatile memory ................................................................................... 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