Lexmark C510

Error Code:

Code: 931
Description: Beam detector error (BDT)
Indicates that printhead laser scanning beam is not detected by the beam sensor.
Remedy: 1 Check LCN connection on laser assembly LDU board. Is connector properly connected? Go to step 2. Properly connect LCN cable. If error clears, problem solved, otherwise go to step 2.
2 Check LCN connection on engine controller board. Is cable properly connected? Go to step 3. Properly connect LCN cable. If error clears, problem solved, otherwise go to step 3.
3 Check cable that connects engine controller board LCN and LDU LCN connectors for continuity and shorted pins. Is cable okay? Replace laser unit assembly. “Laser unit assembly (printhead) removal”. Go to step 4. Replace cable. Go to step 4.
4 Does error clear? Problem solved. Replace engine controller board.

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