Lexmark C510 Service Manual - Page 140
-Laser unit assembly service check, LCN and LDU LCN - 931 service printhead error
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5021-0XX 930,931,932-Laser unit assembly service check Step Questions / actions Yes No 1 Check LCN connection on Go to step 2. laser assembly LDU board. Is connector properly connected? Properly connect LCN cable. If error clears, problem solved, otherwise go to step 2. 2 Check LCN connection on Go to step 3. engine controller board. Is cable properly connected? Properly connect LCN cable. If error clears, problem solved, otherwise go to step 3. 3 Check cable that connects Replace laser Replace cable. engine controller board unit assembly. Go to step 4. LCN and LDU LCN "Laser unit connectors for continuity assembly and shorted pins. Is cable (printhead) okay? removal" on page 4-24. Go to step 4. 4 Does error clear? Problem solved. Replace engine controller board. See "Engine controller board removal" on page 4-55. 2-62 Service Manual
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