Lexmark C510 Service Manual - Page 154
I/O board shield. See, VDC between I/O board
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5021-0XX Step Questions / actions Yes No 3 Turn printer on. Check for 5 Go to step 5. VDC between front cover interlock switch pin 1 (top pin) and ground. Is 5 VDC present? Go to step 4. 4 Turn printer off and check Replace LVPS. Replace cable. cable for continuity See "Low between LVPS ACN2 pin 1 voltage power and cable that connects to supply (LVPS) front cover interlock switch with cage pin 1. Is cable okay? removal" on page 4-60. 5 Turn printer off and remove Go to step 6. I/O board shield. See "I/O board removal" on page 4-70 for steps to remove I/O board shield. Is cable properly connected to I/O board connector DCN18? Properly connect cable. 6 Turn printer on and Go to step 7. override front cover interlock switch. Check for 5 VDC between I/O board DCN18 pin 3 and ground. Is 5 VDC present? Go to step 8. 7 Override top cover interlock Replace I/O Go to step 8. switch in addition to front board. See "I/O cover interlock switch. board removal" Check for 5 VDC between on page 4-70. If I/O board DCN18 pin 1 and problem ground. Is 5 VDC present? persists, replace engine controller board. See "Engine controller board removal" on page 4-55. 2-76 Service Manual