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©
1999 CANON INC. CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
13-51
7 Checking the Potential System
[1] Short J522-1 and -2 on the DC
controller PCB with a jumper wire.
[2] Disconnect J3 from the potential
measurement PCB.
Turn off the potential control
mechanism.
COPIER>OPTION>BODY>PO-CNT '0'
Turn off the power switch.
[1] Remove the jumper wire used to
short J522-1 and -2 on the DC
controller PCB.
[2] Connect J3 on the potential
measurement PCB.
Check to make sure that the
potential measurement PCB is
powered, and check the potential
sensor using the potential sensor
meter electrode.
Turn off the power switch.
Turn on the power switch.
Turn on the potential control mechanism:
COPIER>OPTION>BODY>PO-CNT '1'
Turn off and then on the power switch.
Check the laser output.
Replace the laser unit.
START
NO
YES
NO
YES
YES
NO
Turn on the power switch.
Replace the DC controller PCB.
NO
<Checking the Laser Output>
A
YES
Replace the photosensitive drum. If
the problem is not corrected, check
the laser output.
Turn off potential control:
COPIER>OPTION>BODY>PO-CN-T '0'
END
Select the following in service mode:
COPIER>DISPLAY>HV-STS>PRIARY
(current of primary charging assembly).
Convert the reading (in µA) taken during
copying into a control voltage as in
YES
NO
YES
Measure the voltage PR-CNT during
copying at the J510A-3 on the DC
controller PCB.
Replace the DC controller PCB.
NO
<Checking the Primary Output>
Start service mode:
COPIER>DISPLAY>DPOT>DPOT-K
Is the problem
corrected?
Is the reading
between 0 and 30?
Replace HVT. Is the
problem corrected?
Is the reading of the
following in service mode 50 ±10?
COPIER>DISPLAY>
DPOT>VLIM
Is the laser
output at the
maximum level?
Is the
difference
between the actual
measurement of PR-CNT and the
reading of PRIMARY in
service mode
±10%?
Potential Control Conversion Table.8