HP LaserJet Pro 500 - Page 7

Table of contents
1 Theory of operation .......................................................................................................... 1
Basic operation ........................................................................................................................ 2
Sequence of operation ............................................................................................... 3
Formatter-control system ............................................................................................................ 4
Sleep delay .............................................................................................................. 4
Input/output ............................................................................................................. 4
CPU ........................................................................................................................ 5
Memory ................................................................................................................... 5
Firmware ................................................................................................... 5
Nonvolatile memory ................................................................................... 5
PJL overview ............................................................................................................. 5
PML ......................................................................................................................... 5
Control panel ........................................................................................................... 6
USB flash drive ......................................................................................................... 6
Engine-control system ................................................................................................................ 7
DC controller ............................................................................................................ 8
Solenoids .................................................................................................. 8
Clutches .................................................................................................... 9
Switches ................................................................................................... 9
Sensors ................................................................................................... 10
Motors and fans ....................................................................................... 11
High-voltage power supply ....................................................................................... 12
Low-voltage power supply ........................................................................................ 14
Overcurrent/overvoltage protection ............................................................ 15
Safety ..................................................................................................... 16
Voltage detection ..................................................................................... 16
Sleep (powersave) mode ........................................................................... 16
Power supply voltage detection .................................................................. 17
Low-voltage power supply failure ............................................................... 17
Power Off condition ................................................................................................ 17
Auto on/Auto off mode ............................................................................................ 17
Fuser (fixing) control ................................................................................................ 19
ENWW v
draft version