Checking The High Voltage Control System - Canon CLC5000 Service Manual

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CHAPTER 5 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS

2.10.3 Checking the High Voltage Control System

If an image fault occurs, you must first determine whether the cause is the latent static for-

mation block which includes the photosensitive drum and the potential control system or the

developing/transfer system.

The CLC5000's high-voltage is controlled to a specific level using the environment sensor

and the potential sensor.

b. Target Contrast Potential

The primary grid bias or the developing bias control mechanism may be checked by can-

celing the auto setting mechanism by the environment sensor for target contrast potential.

1) Select 'VCONT' of 'ADJ-MISC' under 'ADJUST' in service mode.

2) Select an appropriate value from the target contrast voltage levels in the following table,

and enter it.

3) Execute 'FUNC > EPC' in service mode.

4) Make copies, and check the images.

If the image is better, suspect a fault in the environment sensor or the environment mea-

surement PCB.

5) Return the setting of 'VONT' of 'ADJ-MISC' under 'ADJUST' in service mode to '0'.

Environment sensor

Potential sensor

Primary grid bias

Transfer blade bias

Separation charging bias

Primary grid bias

Developing bias

2000 2000 2000 2000

CANON CLC5000 REV.0 JAN. 2001

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