Lexmark C510 Service Manual - Page 143

990-Transfer belt unit service check 5021-0XX Step Questions / actions Yes No 1 Open rear cover assembly Clean belt Go to step 2. and check transfer belt unit marker area with markers for stains. Are cotton cloth. If markers stained? problem persists go to step 2. 2 Remove transfer belt unit Replace transfer Reinstall transfer and observe markers on belt unit. See belt unit. Go to side. Are belt markers "Transfer belt step 3. deformed or does transfer unit removal" belt seem hard to rotate? on page 4-7. 3 Turn printer off and remove Go to step 4. I/O board shield. See "I/O board removal" on page 4-70 for steps to remove I/O board shield. Are cables DCN13 and DCN16 properly connected to I/O board? Properly connect cables. If problem persists, go to step 4. 4 Ensure rear cover I/O board is Go to step 5. 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 DCN16 from I/O board. Check for 5 VDC between DCN16 pin 1 to marker sensor. Replace transfer belt marker sensor. Marker sensor is a part of bracket assembly. See "Bracket (on I/O board) and ground assembly (you can touch negative removal" on lead of voltmeter to metal page 4-45. If bracket that holds I/O board to obtain ground.) Is voltage present and correct? problem persists, replace engine controller board. See "Engine controller board removal" on page 4-55. Diagnostic information 2-65