Canon imageRUNNER ADVANCE 6075 Series, Service Manual

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Troubleshooting > Image Faults > MTF Adjustment > When Disabling the MTF Adjustment
Troubleshooting > Image Faults > MTF Adjustment > When Disabling the MTF Adjustment
3) Execute sampling of the MTF value.
Description of adjustment Color/B&W (Lv.1) COPIER > FUNCTION > MISC-R >
Copyboard reading
Color CLM-PLTN
B&W BWM-PLTN
Front side stream reading Color CLM-DF1
B&W BWM-DF1
Back side stream reading Color CLM-DF2
B&W BWM-DF2
NOTE:
In the case of executing sampling of the MTF value several times, execute in arbitrary
order.
4) During the adjustment, “START” is indicated, and once it is terminated normally, “OK!” is
indicated.
At abnormal termination, “NG1 to 3” is indicated.
NOTE:
If “NG1 to 3” is indicated, check the location to set the chart and direction of the chart,
and then executed the adjustment again.
5) Check that the initial setting of the MTF value is set to “1”.
Description of adjustment Color/B&W (Lv.1) COPIER > FUNCTION > MISC-R >
Copyboard reading
Color CLPLT-EN
B&W BWPLT-EN
Front side stream reading Color CLDF1-EN
B&W BWDF1-EN
Back side stream reading Color CLDF2-EN
B&W BWDF2-EN
NOTE:
• The initial value of the MTF value is updated by switching the Control Panel screen.
• After the adjustment, the corresponding MTF value is corrected.
(Lv.1) COPIER > ADJUST > CCD > MTF-xx, MTF2-xx
• When replacing the Reader Controller PCB or the Scanner Unit, check the initial value of
the MTF value. If the value is “1”, it will be necessary to execute the adjustment.
6) Print the image with moiré, and check that moiré is not appeared on the image.
If moiré appears, make a fine adjustment.
T-6-12
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■
When Making Fine Adjustment After Sampling the MTF Value
1) Set the MTF value for fine adjustment to “1”.
Color/B&W (Lv.1) COPIER > FUNCTION > MISC-R >
Color CLM-TGT
B&W BWM-TGT
NOTE:
The MTF value for fine adjustment can be set only after executing sampling of the MTF
value.
2) Recalculate the MTF filter coefficient.
(Lv.1) COPIER > FUNCTION > CCD >
MTF-CLC
3) Print the image with moiré, and check that moiré is not appeared on the image.
If moiré appears, determine the image quality by asking the user to compare the images
before adjustment, after sampling of the MTF value, and after making a fine adjustment.
4) If using the MTF value after sampling as the MTF value, set the MTF value for fine
adjustment to “0” and recalculate the MTF filter coefficient.
If using the MTF value before the adjustment, it disables the MTF adjustment.
■ When Disabling the MTF Adjustment
1) By setting the initial setting of the MTF value to “0”, the MTF value is initialized to the
factory setting value.
Description of adjustment Color/B&W (Lv.1) COPIER > FUNCTION > MISC-R >
Copyboard reading
Color CLPLT-EN
B&W BWPLT-EN
Front side stream reading Color CLDF1-EN
B&W BWDF1-EN
Back side stream reading Color CLDF2-EN
B&W BWDF2-EN
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