Canon CLC5000 Información técnica descargar pdf (Pagina 417)

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101

2001 CANON INC. 2000 2000 2000 2000 CANON CLC5000 REV.0 JAN. 2001

CHAPTER 5 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS

5-60

2.10.3 Checking the High Voltage Control System

a.Outline

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.

CMYK

0 Auto Auto Auto Auto

1 370.00 365.00 390.00 420.00

2 370.00 365.00 390.00 420.00

3 370.00 365.00 390.00 420.00

4 355.00 345.00 370.00 410.00

5 335.00 325.00 340.00 390.00

6 315.00 295.00 310.00 380.00

7 290.00 275.00 295.00 370.00

8 225.00 225.00 245.00 330.00

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’.

Sensor Environment sensor

Environment Primary grid bias

sensor Transfer blade bias

Separation charging bias

Potential sensor Primary grid bias

Developing bias

1 2 ... 412 413 414 415 416 417 418 419 420 421 422 ... 756 757

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