Lexmark Optra N 4040, Reference Handbook

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Laser Printer Reference Handbook
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Laser Diode Failure Replace the printhead assembly. If
this does not correct the problem,
replace the engine board.
Controller Card Failure Replace Controller board
Optional Memory Error Replace the optional memory SIMM.
If this does not correct the problem,
replace the controller board.
Fan Failure Error Refer to the Fan Service Check in
the Service Manual.
ROM Checksum Error Replace the ROM SIMM. If this does
not correct the problem, replace the
controller board.
Blinking Operator Panel LED Action