Canon imageCLASS MF8450c, Service Manual

Page: 288 / 349

Chapter 16
16-7
T-16-4
<CCD>
T-16-5
COPIER > ADJUST > ADJ-XY
Sub item Description
ADJ-X Adjustment of the optical image leading edge position (image reading start position in the sub-scanning direction)
[When used]
Incorrect copyboard reading position in the sub scanning direction.
[Adjustment method]
- When the no-image width is larger than the standard value, decrease the setting value.
- When the area outside of the document field is printed, increase the setting value.
- When the setting value is increased by 1, the image reading start position moves toward the trailing edge by 0.1mm.
Setting range: -100 to 100
[Factory setting value: Differs depending on the machine.]
[Value after RAM clearing: 0]
ADJ-Y Adjustment of the CCD reading start cell position (image reading start position in the main-scanning direction)
[When used]
Incorrect copyboard reading position in the main scanning direction.
[Adjustment method]
- When the no-image width is larger than the standard value, decrease the setting value.
- When the area outside of the document field is printed, increase the setting value.
- When the setting value is increased by 1, the image reading start position moves toward the front side by 0.1mm.
Setting range: 1 to 435
[Factory setting value: Differs depending on the machine.]
[Value after RAM clearing: 169]
ADJ-Y-DF Adjustment of the DF stream reading main-scanning position
[When used]
Incorrect DF stream reading position in the main scanning direction
[Adjustment method]
- When the setting value is increased by 1, the image reading start position moves toward the front side by 0.1mm.
Setting range: 1 to 435
[Factory setting value: Differs depending on the machine.]
[Value after RAM clearing: 338]
STRD-POS Adjustment of the DF stream reading CCD reading position
[When used]
Incorrect DF stream reading position in the sub scanning direction.
[Adjustment method]
- When the setting value is increased by 1, the image reading start position moves toward the leading edge by 0.1mm.
Setting range: -30 to 30
[Factory setting value: Differs depending on the machine. (It differs depending on whether the machine is a reader or an ADF.)]
[Value after RAM clearing: 0]
ADJ-X-MG Fine adjustment of the copyboard reading sub-scanning magnification
[When used]
The image printed in the copy output sheet is larger or smaller than the document image.
[Adjustment method]
Compare the document and copy output sheet, and make an adjustment.
- When the image printed in the output sheet is smaller than the document image, increase the value.
- When the image printed in the output sheet is larger than the document image, decrease the value.
Setting range: -512 to 512
[Factory setting value/Value after RAM clearing: 0]
[Caution: This adjustment is made to adjust the image position, and it may affect the SEND image.]
COPIER > ADJUST > CCD
Sub item Description
W-PLT-X Entry of white level data for standard white plate
Enter a correction value (X) for standard white plate on the backside of the copyboard glass using the service mode after replacement of the copyboard
glass or after execution of RAM clearing for the reader unit.
Setting range: 4096 to 9999
[Factory setting value/Value after RAM clearing: 8232]
W-PLT-Y Entry of white level data for standard white plate
Enter a correction value (Y) for standard white plate on the backside of the copyboard glass using the service mode after replacement of the copyboard
glass or after execution of RAM clearing for the reader unit.
Setting range: 4096 to 9999
[Factory setting value/Value after RAM clearing: 8693]
W-PLT-Z Entry of white level data for standard white plate
Enter a correction value (Z) for standard white plate on the backside of the copyboard glass using the service mode after replacement of the copyboard
glass or after execution of RAM clearing for the reader unit.
Setting range: 4096 to 9999
[Factory setting value/Value after RAM clearing: 9370]
DFTAR-R Entry of the shading target value when DF is used (RED color) (Normal document reading position)
Make the following adjustment using this item.
[When used]
An image failure occurred after execution of ADF white level adjustment (COPIER>FUNCTION>CCD>DF-WLVL1/DF-WLVL2) (caused by a dirt
on the chart, etc.).
Setting range: 0 to 99999
[Factory setting value: Differs depending on the machine]
[Value after RAM clearing: 0]