Canon iR6570 series, Service Manual

Page: 481 / 684

Chapter 13
13-9
F-13-10
Turn off the main power
1. Disconnect the cable used to short the check pins
on the DC controller PCB.
2. Connect the connector used between the DC
controller PCBs of the potential control PCB.
turn off the main power
turn on the main power
Start
NO
YES
turn on the main power
NO
Is the image
better?
YES
YES
NO
YES
Is the difference
between the measured PR-CNT
and 'PRIMARY' shown in service
mode +/-10%?
NO
Try replacing the
high-voltage transformer. Is
the problem corrected?
<Checking the Primary Output>
replace the DC
controller PCB.
replace the DC
controller PCB.
Is the value between
0 and 30?
End
A
Disable the potential control mechanism
by entering '0' for the following:
COPIER>OPTIONAL>BODY>PO-CNT.
1. short CP33 on the controller PCB and GND.
2. disconnect the connector used between DC
controller PCBs of the potential control PCB.
Make the following selections in service mode:
COPIER>DISPLAY>DPOT>DPOT-K
Turn off the potential control mechanism
by entering '0' for the following:
COPIER>OPTION>BODY>PO-CNT.
Make the following selections in service mode
(primary charging assembly current level):
COPIER>DISPLAY>HV-STS>PRIMARY.
Convert the value (in uA) indicated while printing
is under way into a control voltage using the
Potential Control Conversion Table.
Try replacing the photosensitive drum.
If the problem is not corrected, go to
'Checking the Laser Output'.
Measure the voltage HVT_PRIMARY of
J102A-11 on the DC controller PCB while
copying is under way.
Check to make sure that the potential measurement
PCB is supplied with power, and check the potential
sensor using a checking electrode.