Uneven Density - Canon imagePRESS C1 P Service Manual

Field Reedy
When the symptom mentioned above occurs, re-fit the developing
high-voltage cable above the primary corona assembly behind the hopper.

14.3.1.2 Uneven Density

14.3.1.2.1 When copying thin gray lines in Text/Printed Img. mode, moire-like image appears
imagePRESS C1 P / imagePRESS C1 / Color Image Reader-H1 / imagePRESS C1+ (Printer) / imagePRESS C1+
[ Case in the field ]
Description
When copying an image including thin gray lines, a moire-like image appeared; however, this faulty image was improved when changing the original mode
from "Text/Printed Image" to "Text."
Cause
Since the gray lines in the original were too thin, the machine failed the black text judgment.
Field Remedy
a. Set the original mode to any of the following: "Text", "Photo", or "Printed Image", and then make a copy.
b. Set the priority level of "Text/Printed Img." mode to "Text Priority" or "Photo/Image Priority", and then make a copy.
14.3.1.2.2 Uneven density (uneven gross) occurs when copying/printing high-density image with thick coated paper in use
imagePRESS C1 P / imagePRESS C1 / Color Image Reader-H1 / imagePRESS C1+ (Printer) / imagePRESS C1+
[ Inspected by Canon Inc. ]
Description
When copying or printing a high-density image with thick coated paper in use, uneven gross occurred. When the same symptom occurs, perform the following
field remedy while checking images output in each step and improve the degree of uneven gross.
Field Remedy
1. Using A3-size plain paper, perform a double-side job in Black mode and output 5 solid white images (blank images) continuously.
2. Make copies using thick coated papers, and check to see if uneven gross is solved; if solved, finish this field remedy. If not, go to Step 3.
3. Using A3-size plain paper, perform a double-side job in single color mode and output 10 solid red images continuously.
4. Using A3-size plain paper, perform a double-side job in single color mode and output 10 solid green images continuously.
5. Using A3-size plain paper, perform a double-side job in single color mode and output 10 solid blue images continuously.
6. Using A3-size plain paper, perform a double-side job in black mode and output 2 solid black images (while keeping the copyboard cover open)
continuously.
7. Using A3-size plain paper, perform a double-side job in black mode and output 10 solid white images (blank images) continuously.
8. Make copies using thick coated papers, and check to see if uneven gross is solved; if solved, finish this remedy. If not, perform Step 3 through Step 7 again.
9. Make copies using thick coated papers, and check to see if uneven gross is solved; if solved, finish this remedy. If not, go to Step 10.
10. In service mode > COPIER > Option > BODY, change the setting for TEMP-TBL from '0' (default) to '1.'
Note: The new setting value takes effect after powering OFF/ON.
11. Make copies using thick coated papers, and check to see if uneven gross is solved; if solved, finish this remedy. If not, increase the setting value for TEMP-
TBL up to '4' in increment of '1' while checking the output image with each setting.
14.3.1.2.3 Uneven density appears at 4mm intervals in main scanning direction
imagePRESS C1 P / imagePRESS C1 / Color Image Reader-H1 / imagePRESS C1 (CUSTOM) / imagePRESS C1+ (Printer) / imagePRESS C1+
[ Inspected by Canon Inc. ]
Description
Since uneven density occurred at 4mm intervals in the main scanning direction, the 23T/45T gear [A] and the 35T/46T gear [B], which are found in the drum
I.T.B drive assembly, were replaced with new ones at the same time for solution.
F-14-7
Chapter 14
0016-2345
0016-2935
0019-8552
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