Image Adjustment Basic Procedure 5 - Canon iR C6800 Series Service Manual

Chapter 12

12.1.5 Image Adjustment Basic Procedure 5

Image Adjustment Basic Procedure 5
<Check the Primary transfer output>
Image adjustment basic procedure 5
Is the toner image on
the photosensitive drum
before transfer normal?
Turn off the potential control mechanism:
COPIER>OPTION>BODY>P0-CNT '0'
Measure the voltage TR1CONT at J1132B-8 found on
the DC controller PCB during black printing operation.
Make the following selections in service mode (current level of
primary transfer): COPIER>DISPLAY>HV-STS>1TR-K1. Using
the "Potential Control Conversion Table," convert the reading
(in uA) indicated during black printing operation into a control
voltage. Refer to the result as conversion value E.
Is the difference
between the actual measurement
of TR-CNT and the foregoing
value E within +/-20%?
Try replacing HVT2.
Is the fault corrected?
F-12-5
12-6
NO
YES
NO
YES
Replace the DC controller
PCB.
NO
To image adjustment basic
YES
procedure 6
END
Replace the photosensitive
drum.
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