Canon imageRUNNER ADVANCE 9070 PRO series Service Manual Digest page 19

Procedure of 3) Adjust the Primary Charging Assembly (in the case of dark image at the front
adjustment side on the test print).
NOTE :
• In the case of dark image at the front side of the test print [1],
execute step 3-1) through 3-3) below until the density gets even.
Then, if there is no density unevenness, execute the work in
step 5) and later.
• Turning the adjustment screw counterclockwise moves down the
Charging Wire (the gap between the grid and the charging wire
gets narrower), resulting in lighter output image density. Turning
the adjustment screw clockwise moves up the Charging Wire
(the gap between the grid and the charging wire gets wider),
resulting in darker output image density.
[1]
3-1) Turn the plastic screw [A] counterclockwise to make a full round. Refer to
the replacement procedure of the Primary Charging Assembly to install the
Primary Charging Assembly to the Host Machine, and then output the test
print to check the image.
3-2) If the image at the front side of test print image is still dark, turn the
plastic screw [A] counterclockwise to make another full round. Refer to the
replacement procedure of the Primary Charging Assembly to install the
Primary Charging Assembly to the Host Machine, and then output the test
print to check the image.
3-3) If the image at the front side of the test print is still dark, turn the plastic
screw [B] clockwise to make a half round. Refer to the replacement
procedure of the Primary Charging Assembly to install the Primary Charging
Assembly to the Host Machine, and then output the test print to check the
image.
[A]
[B]
Procedure of 4) Adjust the Primary Charging Assembly (in the case of dark image at the rear
adjustment side on the test print).
NOTE :
• In the case of dark image at the rear side of the test print [2],
execute step 4-1) through 4-3) below until the density gets even.
Then, if there is no density unevenness, execute the work in
step 5) and later.
• Turning the adjustment screw counterclockwise moves down the
Charging Wire (the gap between the grid and the charging wire
gets narrower), resulting in lighter output image density. Turning
the adjustment screw clockwise moves up the Charging Wire
(the gap between the grid and the charging wire gets wider),
resulting in darker output image density.
[2]
4-1) Turn the plastic screw [B] counterclockwise to make a full round. Refer to
the replacement procedure of the Primary Charging Assembly to install the
Primary Charging Assembly to the Host Machine, and then output the test
print to check the image.
4-2) If the image at the rear side of the test print is still dark, turn the plastic
screw [B] counterclockwise to make another full round. Refer to the
replacement procedure of the Primary Charging Assembly to install the
Primary Charging Assembly to the Host Machine, and then output the test
print to check the image.
4-3) If the image at the rear side of the test print is still dark, turn the plastic
screw [A] clockwise to make a half turn. Refer to the replacement procedure
of the Primary Charging Assembly to install the Primary Charging Assembly
to the Host Machine, and then output the test print to check the image.
[A]
[B]
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