7-125COPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS36 DC power is absent.CauseAC powr supplyRight coverswitch (SW2,SW3)Wiring, DC loadDC power supplyStep123ChecksIs AC power present between thefollowing terminals?J5327M-1 and J5327M-4 on theDC power supply PCB 1 (upper)J5301M-1 and J5301M-3 on theDC power supply PCB 1 (lower)J5337-1 and J5337-3 on the DCpower supply PCBDisconnect the power plug, andcheck the right cover switch forelectrical continuity. Is it normal?Disconnect all connectors except forthe following:J5327M on the DC power supplyPCB 1 (upper)J5301M on the DC power supplyPCB 1 (lower)J5337 on the DC power supplyPCB 2Connect the power plug, and turn ONthe power switch. Is the DC powersupply output of the above connec-tors on the DC power supply normal?Be careful to avoid shortingthe connectors.Keep in mind that +24VUand +214VR are not gener-ated.Yes/NoNONOYESNOActionSee “AC power is absent.”Replace the right coverswitch.Turn OFF the powerswitch, and connect oneof the disconnectedconnectors; then, turn ONthe power. Repeat this forall connectors to find outwhich connector activatesthe protection circuit.Check the wiring from thatconnector to the DC load.Replace the faulty DCpower supply PCB.
