E100; E110 - Canon iR8500 Service Manual

4.1.22 E100

BD PCB
1) Make the following selections in service mode:
YES: Check the connection between the BD PCB and the laser driver
Laser output, DC controller PCB
2) Is the reading of 'VDM' between 360 and 420?
YES: Check the following:
NO:

4.1.23 E110

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