Lexmark Optra E 4026-0 Series Reference Handbook page 13

Blinking Operator Panel LED
Laser Diode Failure
Controller Card Failure
Optional Memory Error
Fan Failure Error
ROM Checksum Error
1-6
Laser Printer Reference Handbook
Action
Replace the printhead assembly. If
this does not correct the problem,
replace the engine board.
Replace Controller board
Replace the optional memory SIMM.
If this does not correct the problem,
replace the controller board.
Refer to the Fan Service Check in
the Service Manual.
Replace the ROM SIMM. If this does
not correct the problem, replace the
controller board.