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Sequence of operation ..................................................................................................... 114
Formatter system ............................................................................................................................. 116
Sleep mode ...................................................................................................................... 116
Resolution ....................................................................................................................... 117
Input/output ...................................................................................................................... 117
CPU ................................................................................................................................. 117
Memory ............................................................................................................................ 117
Hard disk ......................................................................................................... 117
Random-access memory ................................................................................ 117
DIMM slot ........................................................................................................ 118
Firmware ......................................................................................................... 118
Nonvolatile memory ........................................................................................ 118
PJL overview ................................................................................................................... 118
PML ................................................................................................................................. 118
Control panel ................................................................................................................... 118
Engine-control system ...................................................................................................................... 119
DC controller .................................................................................................................... 120
Solenoids ........................................................................................................ 120
Switches .......................................................................................................... 121
Sensors ........................................................................................................... 122
Motors and fans .............................................................................................. 123
Fuser control .................................................................................................................... 125
Fuser temperature-control circuit .................................................................... 127
Fuser over-temperature protection .................................................................. 128
Fuser-failure detection .................................................................................... 129
Fuser identification .......................................................................................... 129
Fuser-life detection .......................................................................................... 130
Relay-failure detection ..................................................................................................... 130
Low-voltage power supply ............................................................................................... 130
Overcurrent/overvoltage protection ................................................................. 131
Safety .............................................................................................................. 131
Voltage detection ............................................................................................ 131
Sleep (powersave) mode ................................................................................ 131
High-voltage power supply .............................................................................................. 131
Laser/scanner system ...................................................................................................................... 134
Image-formation system ................................................................................................................... 136
Image-formation process ................................................................................................. 137
Step 1: Pre-exposure ...................................................................................... 138
Step 2: Primary charging ................................................................................. 138
Step 3: Laser-beam exposure ......................................................................... 139
Step 4: Development ....................................................................................... 139
Step 5: Primary transfer .................................................................................. 140
Step 6: Secondary transfer ............................................................................. 140
Step 7: Separation .......................................................................................... 141
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