Canon imageRUNNER ADVANCE 8105 Series Service Manual page 149

2
Technology > Image Formation System > Servicing > Troubleshooting
MEMO:
It is difficult to judge whether uneven potential of the Photosensitive Drum causes
uneven density of the output image, so output 3 sheets of the test print and adjust the
area where all
3 sheets have the same symptom.
(If the same symptom is seen on the same spot of all 3 sheets, it is possibly caused from
the Drum.)
<Test pattern>
2
Technology > Image Formation System > Servicing > Troubleshooting
MEMO:
For the test print, the following 3 types can be output, but basically set SHD-P1 to
output. The following shows the use case of each test print.
COPIER>FUNCTION>2D-SHADE>SHD-P1
: When the image which uneven density occurs is the halftone image with light density
COPIER>FUNCTION>2D-SHADE>SHD-P2
: When the image which uneven density occurs is the halftone image with dark density
COPIER>FUNCTION>2D-SHADE>SHD-P3
: In case of the secure watermark image with uneven density
5) Check (T-shaped) halftone area of the output test print visually and adjust the area of
uneven density.
5-1) Take a note to write down the values of the following service mode.
When the adjustment cannot be performed appropriately, these values are required to
return to the initial values.
COPIER>FUNCTION>2D-SHADE>M-LINE1 (Level 2)
COPIER>FUNCTION>2D-SHADE>M-LINE2 (Level 2)
COPIER>FUNCTION>2D-SHADE>S-LINE1 (Level 2)
COPIER>FUNCTION>2D-SHADE>S-LINE2 (Level 2)
COPIER>FUNCTION>2D-SHADE>S-LINE3 (Level 2)
COPIER>FUNCTION>2D-SHADE>S-LINE4 (Level 2)
5-2) Adjust the target horizontal scanning direction (A to O) which uneven density is seen.
After selecting "M-LINE1/M-LINE2", select the target horizontal scanning window (A to
O), and enter the numerical value using "numerical keypad".
COPIER>FUNCTION>2D-SHADE>M-LINE1 (Level 2) Horizontal scanning direction A
to H
COPIER>FUNCTION>2D-SHADE>M-LINE2 (Level 2) Horizontal scanning direction I
to O
MEMO:
Be sure to switch the screen after entering the value. Unless the screen is switched, the
•
numerical value is not reflected. (Actually, the value is not reflected on the screen, but it
is retained internally.)
•
When the horizontal scanning direction (H line) is adjusted, the adjustment value of the
vertical scanning direction (1 to 27) is also changed.
F-2-123 F-2-123
•
Be sure to make adjustment in order of horizontal and vertical scanning directions. If the
adjustment is executed in the inverse order, it may not be executed correctly.
• Entering 96 or larger value can generate an error in potential control (E061).
In the case of an error, adjust the setting value between 0 and 95
2-96
2-96