Service Manual
Page 148
...4. Replace OPC marker sensor. If problem markers covered with cotton markers on page 4-69. See "I /O board shield. Wait until printer displays error and remove DCN5 from I /O board shield. Check for steps to obtain ground.) Is voltage present and correct? Are cables DCN5 and DCN13 ..., replace lead of voltmeter to marker sensor. board. If (on . 5021-0XX 994-OPC belt marker sensor service check Step Questions / actions Yes No 1 Remove photodeveloper Clean marker Go to step 3. See "Engine controller board removal" on page 4-70 for 5 VDC between DCN5 pin 1 to ...
...4. Replace OPC marker sensor. If problem markers covered with cotton markers on page 4-69. See "I /O board shield. Wait until printer displays error and remove DCN5 from I /O board shield. Check for steps to obtain ground.) Is voltage present and correct? Are cables DCN5 and DCN13 ..., replace lead of voltmeter to marker sensor. board. If (on . 5021-0XX 994-OPC belt marker sensor service check Step Questions / actions Yes No 1 Remove photodeveloper Clean marker Go to step 3. See "Engine controller board removal" on page 4-70 for 5 VDC between DCN5 pin 1 to ...