Canon imagePRESS C1 P, Service Manual, Page: 741 / 1265

Chapter 14
14-6
F-14-6
14.3 Troubleshooting
14.3.1 Image Faults
14.3.1.1 Light Image / Weak Density
14.3.1.1.1 When printing on CLC extra heavy paper (209g), light image occurs at solid black areas of output image
0018-5273
imagePRESS C1 P / imagePRESS C1 / Color Image Reader-H1 / imagePRESS C1 (CUSTOM) / imagePRESS C1+ (Printer) / imagePRESS C1+
[ Case in the field ]
Description
When printing on CLC extra heavy paper (209g), light image or uneven density occurred at solid black areas on the output image. In order to improve the
symptom, the secondary transfer voltage was adjusted under user mode.
Reference: The secondary transfer voltage is a voltage used to transfer toner image to paper. It is adjusted when output images become light or are distorted
compared to the images on the standard paper.
Field Remedy
When the symptoms mentioned above occur, adjust the secondary transfer voltage in the procedure below.
1. In service mode > COPIER > Option > BODY > IMGC-ADJ, change the setting from '0' (default) to '1'.
Reference: IMGC-ADJ is used to switch the display mode of the image adjustment items used by the system administrator. Setting this to '1' will display the
following items: curl correction level adjustment, paper separation fan level adjustment, image location adjustment, secondary transfer voltage adjustment,
and gloss adjustment.
2. In user mode > System Settings > Paper Type Management Settings, select a type of paper that has the most similar characteristics as the paper causing
the symptom, press Duplicate, and input a name for the paper type; then press OK.
3. Select the type of paper registered in Step2 above, and make the selections like Details/Edit > Secondary Transfer Voltage > Change; then adjust the
secondary transfer voltage using "+" or "-" and press OK.
As for the adjustment direction ([+] or [-]), please refer to the attached PDF file. The adjustable range is between '-10' and '+10'.
T-14-2
Note: Please explain to the user that they have to minimize the use of the foregoing image adjustment items by persons other than the system administrator
as possible as they can even though IMGC-ADJ has switched the display mode of such items.
14.3.1.1.2 Uneven density/light image: Developing high-voltage cable has poor contact
0018-7651
imagePRESS C1 P / imagePRESS C1 / Color Image Reader-H1 / imagePRESS C1 (CUSTOM) / imagePRESS C1+ (Printer) / imagePRESS C1+
[ Case in the field ]
Description
Since uneven density/light image occurred, the developing high-voltage cable above the primary corona assembly behind the hopper was re-connected for
solution. In this field case, there was no quality problem with test print images generated during the auto gradation adjustment.
Adjustment in [-] Direction is Recommended Adjustment in [+] Direction is Recommended
Paper Waight Ligh (thin paper) Heavy (thick paper)
Surface Texture Smooth Rough
Friction Low (smooth) High (rough)
Density Areas of low toner density are light. Areas of high toner density are light.
Poor Images
Tiny white spots appear on areas of high density. Outline blurring due to excessive amount of toner.
Text and fine line smear.
White spots appear on areas of high density.
Light Areas
White Area White Area