Checking The Potential System - Canon ImageRunner 600 Service Manual

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

Checking the Potential System

A
YES
NO
13-51