39. The blank exposure lamp fails to turn ON.40. The pre-exposure lamp fails to turn ON.COPYRIGHT © 1997 CANON INC. CANON NP6045 REV. 1 MAR. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 10 TROUBLESHOOTING10-97CauseDC controllerPCBBlank exposurelampDC controllerPCBChecksRemove the blank exposure lamp,and connect the connector. Select'BLANK' in service mode ( ) .Does the blank exposure lampturn ON normally when the usermode key is pressed?Replace the blank exposure lamp.Does it turn ON normally?]4]Step12YES/NOYESYESNOActionCheck the wiring fromthe blank exposure unitto the DC controllerPCB; if normal, replacethe DC controller PCB.End.Check the wiring fromthe blank exposure lampto the DC controllerPCB; if normal, replacethe DC controller PCB.CauseDC controllerPCBPre-exposurelamp PCBChecksSet the tester range to 30 VDC.Does the voltage between J103B-2 (+) and GND on the DCcontroller PCB change from 24 to0 V when the Copy Start key ispressed?Step1YES/NONOYESActionReplace the DCcontroller PCB.Check the wiring fromthe DC controller PCB tothe pre-exposure lampPCB; if normal, replacethe pre-exposure lampPCB.
