Canon iR8500 Service Manual page 461

CHAPTER 6 TROUBLESHOOTING
8) Connect the cable [1] of the potential sensor checking electrode to the frame (GND)
[2] of the machine.
Be sure to allow enough space from the sensor window so that the clip will
never come into contact with the sensor cover.
9) Fit the door switch actuator into the door switch assembly.
10) Turn on the power switch.
After turning on the power switch, do not touch the potential sensor assem-
bly.
11) Make the following selections in service mode, and check to see that the reading for
initial rotation is between 0 and 30: COPIER>DISPLAY>DPOT>DPOT-K.
1. If the reading in method 1 is as indicated but the reading in method 2 is
not as indicated,
REF.
Suspect dirt on the sensor or a fault in the potential measurement unit.
2. If the readings in both methods 1 and 2 are as indicated,
It is safe to assume that the operation and the signal path from the poten-
tial sensor unit to the microprocessor on the DC controller PCB are nor-
mal.
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F06-207-16
COPYRIGHT© 2001 CANON INC.
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2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001