Canon PC980 Service Manual - Page 323

CHAPTER 11 TROUBLESHOOTING 18 The copy has a blurred image. Cause Scanner drive cable Scanner rail Feeding system Cartridge Step 1 2 3 4 Checks Does the cable wind on itself when the scanner is moving? Or, is the cable too slack or too taut? Move the No. 1 mirror mount slowly by hand. Does it move slowly? Is abnormal noise heard from the scanner motor? Does the copy paper spring up or stop around the transfer assembly? YES/NO YES NO YES YES NO Action 1. Route the cable correctly. 2. If the cable is twisted or frayed, replace it. Clean the surface of the scanner rail with alcohol. Then, apply lubricant. (CK-0551) See "The scanner fails to move forward/in reverse." Check the feeding assembly for burrs. Replace the cartridge. 19 The copy has horizontal fogging. Cause Scanning lamp Cartridge, High-voltage transformer assembly Step 1 2 Checks Does the scanning lamp flicker? Replace the cartridge. Is the problem corrected? Scanning system Feeding system 3 Make a reduced copy, and compare it against one made in Direct. Is the problem found at different positions? YES/NO YES YES NO YES NO Action Replace the scanning lamp. End. Check the highvoltage transformer (composite power supply PCB). Check the scanning system. Check the feeding system. 11-58 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)