Table of contents 1 Theory of operation .......................................................................................................... 1 Basic operation ........................................................................................................................ 2 Major systems ........................................................................................................... 2 Product block diagram ............................................................................................... 2 Sequence of operation ...............................................................................................
3 Normal sequence of operation ..................................................................... 3 Formatter-control system ............................................................................................................ 4 Auto on/Auto off mode .............................................................................................. 4 Input/output ............................................................................................................. 6 CPU ........................................................................................................................
6 Memory ................................................................................................................... 6 Firmware ................................................................................................... 6 PJL overview ............................................................................................................. 6 Nonvolatile memory ................................................................................... 6 PML .........................................................................................................................
7 Control panel ........................................................................................................... 7 Engine-control system ................................................................................................................ 8 Motors, fans, clutches, solenoids, switches, and sensors ................................................. 9 DC controller operations .......................................................................................... 16 Fuser-control circuit ..................................................................................................
18 Fuser failure detection ............................................................................... 19 Fuser temperature control .......................................................................... 20 Low-voltage power supply ........................................................................................ 22 Fuser protective function ............................................................................ 21 Overcurrent/overvoltage protection ............................................................ 23 High-voltage power supply .......................................................................................
24 Formatter ............................................................................................................... 25 Laser/scanner system .............................................................................................. 26 Formatter heartbeat LED ............................................................................ 25 Laser failure detection ............................................................................... 27 Image-formation system ...........................................................................................................
28 Electrophotographic process ..................................................................................... 28 ENWW v