Table of contents 1 Theory of operation Basic operation ..................................................................................................................................... 2 Major printer systems .......................................................................................................... 2 Printer 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 ................................................................................................................................
5 Optional hard disk ............................................................................................... 5 Firmware ............................................................................................................. 5 Nonvolatile memory ............................................................................................ 5 PJL overview ....................................................................................................................... 5 PML .....................................................................................................................................
5 Control panel ....................................................................................................................... 5 Engine-control system .......................................................................................................................... 6 Motors, fans, clutches, solenoids, switches, and sensors ................................................... 7 DC controller operations .................................................................................................... 14 Fuser-control circuit ...........................................................................................................
16 Fuser failure detection ....................................................................................... 17 Fuser temperature control ................................................................................. 18 Fuser protective function ................................................................................... 19 Low-voltage power supply ................................................................................................. 20 Overcurrent/overvoltage protection ................................................................... 21 High-voltage power supply ................................................................................................
22 Formatter ........................................................................................................................... 23 Formatter heartbeat LED .................................................................................. 23 DIMM slots ........................................................................................................ 23 Laser/scanner system ........................................................................................................ 24 Laser failure detection .......................................................................................
25 Image-formation system ..................................................................................................................... 26 Electrophotographic process ............................................................................................. 26 ENWW v