To set the wake time .........................................................................................124
Setting the sleep delay ......................................................................................................125
To set the sleep delay .......................................................................................125
5 Theory of operation
Basic operation ...................................................................................................................................128
Operation sequence ..........................................................................................................128
Power on sequence ...........................................................................................................129
Internal components ...........................................................................................................................131
Formatter system ................................................................................................................................133
Sleep mode ........................................................................................................................133
Image Resolution Enhancement technology (REt) ...........................................................134
Input/Output .......................................................................................................................134
Parallel interface ...............................................................................................134
USB 2.0 connector ............................................................................................134
ACC accessory port ..........................................................................................134
Flash ..................................................................................................................135
Hard drive accessory ........................................................................................135
CPU ...................................................................................................................135
Printer memory ..................................................................................................................135
Read-only memory ............................................................................................135
Random-access memory ..................................................................................135
DIMM slots .........................................................................................................................135
Flash memory ...................................................................................................135
Nonvolatile memory ..........................................................................................135
PJL overview ......................................................................................................................136
PML ....................................................................................................................................136
Control panel ......................................................................................................................136
Engine control system .........................................................................................................
...............137
DC controller PCB ..............................................................................................................137
Block operation .................................................................................................139
Motors, fans, and environment sensor ..............................................................................139
Failure detection ................................................................................................................141
Drum motor failure detection .............................................................................141
Fuser motor failure detection ............................................................................142
ETB motor failure detection ..............................................................................142
Upper exhaust fan failure detection ..................................................................142
Cartridge fan failure detection ...........................................................................142
Delivery fan failure detection .............................................................................142
Power supply fan failure detection ....................................................................142
Duplexer fan failure detection ...........................................................................143
Low-voltage power supply .................................................................................................143
Fuser control circuit ...........................................................................................143
Low-voltage power supply circuit ......................................................................145
Protective functions ..........................................................................146
Safety ...............................................................................................147
Sleep mode ......................................................................................147
Power supply recognition .................................................................147
Heater temperature control ................................................................................................147
Initial rotation temperature control ....................................................................148
ENWW vii
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