Canon PC940 Service Manual - Page 331

CHAPTER 11 TROUBLESHOOTING 12 E400 Cause Step 1 Checks Turn off and then on the power. Is the probrem corrected? 5V power supply 2 Set the matter to the 20VDC range, and connect the + probe to the foot of the push swich on the ADF controller PCB and the - probe to the copier ground. Is the voltage about 5V? YES/NO YES NO Action End. (Check the wiring between the copier's DC controller PCB and the ADF controller PCB.) Replace the ADF controller PCB. 345 ON 12 BCD EF 0 1 2 6 7 8 9A Figure 11-402 ADF controller PCB 3 Replace the ADF controller PCB. Is the problem corrected? YES End. NO Replace the copier's DC controller PCB. 13 E803 Cause Malfunction DC controller PCB. Composite power supply PCB Step 1 2 Checks Turn off and then on the power switch. Is the problem corrected? Replace the DC controller PCB. Is the problem corrected? YES/NO Action YES End. YES End. NO Replace the composite power supply PCB. 11-66 11-66 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)