Lexmark C510 Service Manual - Page 148

5021-0XX 994-OPC belt marker sensor service check Step Questions / actions Yes No 1 Remove photodeveloper Clean marker Go to step 2. cartridge and observe area with cotton markers on side. Are belt cloth. If problem markers covered with persists go to foreign particles? step 2. 2 Reinstall photodeveloper Go to step 3. cartridge. Turn printer off and remove I/O board shield. See "I/O board removal" on page 4-70 for steps to remove I/O board shield. Are cables DCN5 and DCN13 properly connected to I/O board? Properly connect cables. If problem persists, go to step 3. 3 Ensure rear cover I/O board is Go to step 4. assembly and front cover providing 5 VDC assembly are closed. Override top interlock switch and turn printer on. Wait until printer displays error and remove DCN5 from I/O board. Check for 5 VDC between DCN5 pin 1 to marker sensor. Replace OPC marker sensor. See "Marker sensor assembly removal" on page 4-69. If (on I/O board) and ground problem (you can touch negative persists, replace lead of voltmeter to metal engine controller bracket that holds I/O board to obtain ground.) Is voltage present and correct? board. See "Engine controller board removal" on page 4-55. 2-70 Service Manual