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 ..................................................................................................................... 4 Sleep mode .......................................................................................................................... 4 Input/output ..........................................................................................................................
4 CPU ..................................................................................................................................... 4 Memory ................................................................................................................................ 4 Firmware ............................................................................................................. 5 Memory use ........................................................................................................ 5 PJL overview .......................................................................................................................
5 LEDM overview .................................................................................................................... 5 ACL overview ....................................................................................................................... 5 Control panel ....................................................................................................................... 6 Engine-control system .......................................................................................................................... 7 Motors, fans, clutches, solenoids, switches, and sensors ...................................................
8 DC controller operations .................................................................................................... 13 Fuser-control circuit ........................................................................................................... 15 Fuser failure detection ....................................................................................... 16 Fuser temperature control ................................................................................. 17 Fuser protective function ...................................................................................
18 Pressure roller cleaning .................................................................................... 18 Low-voltage power supply ................................................................................................. 19 Overcurrent/overvoltage protection ................................................................... 20 High-voltage power supply ................................................................................................ 21 Laser/scanner system ........................................................................................................
22 Laser failure detection ....................................................................................... 23 Image-formation system ..................................................................................................................... 24 Electrophotographic process ............................................................................................. 24 Image formation process ................................................................................................... 26 Latent-image formation stage ........................................................................... 27 ENWW v