COPYRIGHT
©
2001 CANON INC. 2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001
CHAPTER 6 TROUBLESHOOTING
6-107
4.1.22 E100
BD PCB
1) Make the following selections in service mode:
COPIER>DISPLAY>DPOT. Is the reading of ‘VLIM’ between 50
and 90?
YES: Check the connection between the BD PCB and the laser driver
PCB/DC controller PCB and the position of the BD PCB. If nor-
mal, replace the BD PCB.
Laser output, DC controller PCB
2) Is the reading of ‘VDM’ between 360 and 420?
YES: Check the following:
• Laser output
• Laser optical path for foreign matter
NO: Replace the DC controller PCB.
4.1.23 E110
Connector
1) Is the connector J762 on the laser scanner motor driver PCB con-
nected securely?
NO: Connect the connector securely.
Connector
2) Is the connector J503 on the DC controller PCB connected se-
curely?
NO: Connect the connector securely.
Laser scanner unit, DC controller PCB
3) Try replacing the laser scanner unit. Is the problem corrected?
NO: End.
YES: Replace the DC controller PCB.
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