Canon iR5000i Service Manual page 606

CHAPTER 3 STANDARDS AND ADJUSTMENTS
3-36 T
Checking the Developing Bias Output
Enable potential control: COPIER>
OPTION>BODY>PO-CNT=1
Measure the voltage DEV-DC-CNT
during printing of J102A-8 on the DC
controller PCB.
Make the following selections (DC
value of the developing bias):
COPIER>DISPLAY>HV-STS>BIAS.
Covert the indication during printing
(V) into a control voltage with
reference to 8.5 "Potential Control
Conversion Table."
Is the
deferense between
the actual measurement of Replace the DC controller
NO
DEV-DC-CNT and 'BIAS' in
PCB.
service mode
± 10%?
YES
Check the developing assembly for
leakage; if normal, go to a check on the
transfer output.
Checking the Transfer Output
Is the toner
image on the photosensitive NO
Replace the photosensitive
drum before transfer
drum.
normal?
YES
Disable potential control: COPIER>
OPTION>BODY>PO-CNT=0.
Measure the voltage TR-CNT during
printing of J102A-12 on the DC
controller PCB.
Make the following selections in service
mode (level of current of transfer
charging). Convert the reading (µA) during
printing into a control voltage based on 8.5
"Potential Control Conversion Table."
Is the
difference between the
Replace the DC controller
NO
actual measurement of TR-CNT
PCB.
and 'TR' in service
mode ± 10%?
YES
Replace the
high-voltage transformer.
YES
Is the problem
corrected?
NO
1) Check the transfer charging assembly for
leakage.
2) Make the following selections in service
mode, and try changing the setting:
COPIER>OPTION>BODY>FUZZY.
3) Try replacing paper.
COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000
END
CANON iR5000i/iR6000i REV.0 JUNE 2001