Table of contents
1 Theory of operation .......................................................................................................... 1
Basic operation ........................................................................................................................ 2
Major print systems ................................................................................................... 2
Internal components .................................................................................................. 3
Operating sequence .................................................................................................. 7
Formatter system ...................................................................................................................... 8
Sleep mode .............................................................................................................. 8
Input/output ............................................................................................................. 8
USB .......................................................................................................... 8
Embedded print server ................................................................................ 9
Hard-disk .................................................................................................. 9
CPU ......................................................................................................... 9
Memory ................................................................................................................... 9
Random-access memory .............................................................................. 9
Nonvolatile memory ................................................................................... 9
DIMM slot ................................................................................................................ 9
PJL overview ........................................................................................................... 10
PML ....................................................................................................................... 10
Control panel ......................................................................................................... 10
Engine-control system .............................................................................................................. 11
DC controller PCA ................................................................................................... 12
Sensors, solenoids, and switches ............................................................................... 13
Motors and fans ...................................................................................................... 14
Failure detection ...................................................................................... 14
Motor failure ............................................................................ 14
Fan motor failure ....................................................................... 14
Engine power supply ................................................................................ 15
Fuser-control circuit .................................................................... 15
Low-voltage power supply .......................................................... 17
High-voltage power supply ......................................................... 18
Overcurrent/overvoltage protection ............................................. 19
Image-formation system ........................................................................................................... 20
ENWW v
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