Lexmark Optra C710 Service Manual - Page 140

5016-001 FRU Action 5 LVPS Fuses Check the AC line voltage on the LVPS at F401, F402 connectors CN404 and CN405. either or both continue to blow after being replaced. • If incorrect, go to step 6. • If correct, disconnect the cables to CN401, CN402 and CN403. (Continued) Check the voltage at CN401 pin 1 or 2. The voltage should measure approximately +5 V dc. • If incorrect, replace the LVPS. • If correct, reconnect the cable to CN401 and recheck the voltage. If incorrect, go to step 6. • If correct, reconnect the cable to CN402 and recheck the voltage. If incorrect, go to step 7. • If correct, reconnect the cable to CN403 and recheck the voltage. If incorrect, go to step 8. CN401 Pin 1, Pin 2 Approximately +5 V dc Pin 3, Pin 4 Ground Pin 5 Fuser On CN402 Pin 1, Pin 2 Approximately +5 V dc Pin 3, Pin 4 Ground 6 LVPS Fuses The problem might be with the following: F401, F402 either or both continue to blow after being replaced. • Interconnect board. • Any option installed on the interconnect board. • Controller board. (Continued) • COS. • Memory DIMM installed on the controller board. Remove and replace one FRU at a time until you find the failing component. 7 LVPS Fuses The problem might be with the following: F401, F402 either or both continue to blow after being • Engine board • Any sensor or motor connected to the engine board. replaced. Remove and replace one FRU at a time until (Continued) you find the failing component. 2-74 Service Manual