COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001CHAPTER 6 TROUBLESHOOTING6-1074.1.22 E100BD PCB1) Make the following selections in service mode:COPIER>DISPLAY>DPOT. Is the reading of ‘VLIM’ between 50and 90?YES: Check the connection between the BD PCB and the laser driverPCB/DC controller PCB and the position of the BD PCB. If nor-mal, replace the BD PCB.Laser output, DC controller PCB2) Is the reading of ‘VDM’ between 360 and 420?YES: Check the following:• Laser output• Laser optical path for foreign matterNO: Replace the DC controller PCB.4.1.23 E110Connector1) Is the connector J762 on the laser scanner motor driver PCB con-nected securely?NO: Connect the connector securely.Connector2) Is the connector J503 on the DC controller PCB connected se-curely?NO: Connect the connector securely.Laser scanner unit, DC controller PCB3) Try replacing the laser scanner unit. Is the problem corrected?NO: End.YES: Replace the DC controller PCB.
