Canon imageRUNNER ADVANCE 6075 Series Service Manual page 145

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Technology > Image Formation System > Servicing > Troubleshooting
● Uneven density correction by 2D shading
To correct uneven image density caused by uneven potential on the surface of the Drum.
NOTE:
This machine performs two dimensional shading which replaces uneven potential of
the Photosensitive Drum to the exposure amount to correct. (Default: two dimensional
shading is disabled.) As the data of Drum's uneven potential, the data measured at the
shipment of the Drum is used.
CAUTION:
This adjustment is executed when the preferred image is not output even if the Primary
Charging Wire height adjustment and secure watermark adjustment * are performed.
* Secure watermark adjustment: Function Settings>Common>Print Settings>Secure
Watermark Settings>Adjust Background/Character Contrast
1) Check that the two dimensional shading is enabled.
COPIER>OPTION>IMG-LSR>2D-SHADE 1: Enabled
2) Turn OFF and then ON the main power switch.
CAUTION:
Be sure to turn OFF and then ON the main power switch after step 1. Uneven density
may be reduced by the two dimensional shading correction at the startup.
2 Technology > Image Formation System > Servicing > Troubleshooting
3) Output a halftone image with the following conditions and check if uneven density occurs.
COPIER>TEST>PG>TYPE 6
Select the cassette which the following paper is set: COPIER>TEST>PG>PG-PICK A3
(LDR) or larger.
When uneven density is seen: Go to step 4.
When uneven density is not seen: Procedure is ended.
4) Output a test pattern for two dimensional shading.
COPIER>FUNCTION>2D-SHADE>SHD-P1
4-1) Set the cassette.Select the cassette which A3 (LDR) or larger paper is set.
Select "SHD-P1" and cassette using "numeric keypad".
4-2) Output 3 sheets of the test pattern.
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F-2-114
F-2-115
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