Lexmark C720 Service Manual - Page 147

5024-001 995-OPC Belt Cartridge, Belt Marker Sensor (PBS) Service Check FRU 1 Belt Cartridge (OPC) 2 Check Connector 3 Belt Marker Sensor (PBS) 4 Main Engine (MCTL P.W.B.) Board Action Ensure the printer is level. If the belt sensor (PBS) is stained, clean the belt marker sensor. Replace the OPC belt cartridge if it is damaged or leaning to one side. Ensure a proper connection between DCN16 on the IOD1 P.W.B. board and the belt marker sensor (PBS). Ensure a proper connection between DCN1 on the IOD1 P.W.B. board and 11CN on the main engine (MCTL P.W.B.) board. Check for +5V between DCN16-2 and DCN16-3 on the IOD1 P.W.B. board. If the voltage is +5V, replace the belt marker sensor. Check for +5V between DCN2-1 and DCN2-4 on the IOD1 P.W.B. board. If the voltage is +5V, replace the IOD1 P.W.B. board. If the problem still exists, replace the main engine (MCTL P.W.B.) board. Diagnostic Information 2-67