COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR8500 REV.0 MAR. 2001CHAPTER 6 TROUBLESHOOTING6-133ConnectorJ1704J1705J1706Pin No.131351Output voltage12 V3.3 V+8 V−8 V15 V5 VRemarks+7%, −10%±5%±10%±10%±10%±4%4.1.73 DC power is absent 1Control pane power switch1) Is the main power lamp ON?YES: See “DC power is absent 2.”AC power supply2) Is the rated voltage present between the connectors J28-1 and -5and between J28-2 and -7 on the DC power supply PCB?NO: See “AC power is absent.”Wiring3) Is the connection of the cable of the connector J1701-4 (overcurrentdetection signal 1) of the relay PCB normal?NO: Correct the connection.Fuse (FU101)4) Is the fuse (FU101) on the DC power supply blown?YES: Remove the cause of the fuse, and replace the fuse.Wiring, DC load, DC power supply PCB5) Turn offf the main power switch. In about 3 min, turn on the minpower switch. Is the voltage between the following terminals on therelay PCB normal?However, the output voltages in the table assume that the AC inputvoltage is ±10% in terms of tolerance:YES: Turn offf the power switch, and disconnect the following connec-tors from the relay PCB:• J1711• J1712• J1714• J1716• J1718Connect one of the disconnected connectors, and turn on the powerswitch. Repeat this on all connectors to find out the connector thatactivates the protection circuit, and check the wiring and DC loadfrom that connector.NO: Replace the DC power supply PCB.
