Canon imagePRESS C800 Series, Troubleshooting Manual

Page: 57 / 256

Chapter 1
1-43
7) In Service Mode > Mode List > COPIER > Function > INSTALL > "INIT-ITB," and adjust the ITB neutral position.
8) Settings/Registration > Adjustment/Maintenance > Adjust Image Quality > Auto Correct Color Mismatch > press "Start."
9) Go to Service mode > Mode List > COPIER > Option > FNC-SW > Enter "1" to "T1HP-POS", then perform a power-cycle of main power by turning it off and
on ("0" by default).
Change of the parameter makes the primary transfer rollers of all the colors contact with ITB in black and white mode.
10) Output the image having shown the symptom, and check that the symptom does not occur.
1.1.1.7 Poor Finxing
1.1.1.7.1 Fixing failure due to low temperature environment
0031-6228
[ Manual-related ]
Description
If you print high-density images on heavy paper continuously in the low-temperature environment, toner may not be properly applied to the images as the fixing
unit is not fully warmed up.
You can solve this problem by slowing down the print speed.
Field Remedy
1) Select Service Mode > COPIER > Option > DSPLY-SW > IMGC-ADJ (Display/hide of image adjustment item in user mode), and set "1 (Display)".
2) Select Settings/Registration > Adjustment/Maintenance > Adjust Image Quality > Low Temperature Environment Mode, adjust the level of Low Temperature
Environment Mode by "-" or "+" and then press OK.
[Caution] If you increase the value of the settings, toner is properly applied but the print speed may be adversely affected.
[Reference]
The adjustment can also be made from Service Mode > COPIER > Option > IMG-FIX > LL-DWN (Level setting for low temperature environment mode).
- 0: OFF
- 1: Level 1
- 2: Level 2
- 3: Level 3
- 4: Level 4
[Caution] As the value is larger, fixing performance is improved, but the machine is likely to go into the down sequence (approx. 90% productivity).
1.1.1.8 Stretching/Shrinking
1.1.1.8.1 Difference in size occur between the size of original image and the size of copied image/How to adjust
magnification fine adjustment
0031-5506
[ Manual-related ]
Description
When copying, a slight difference in size may occur between the size of the original image, and the size of the copied image. In this case, you can perform a fine
adjustment to compensate for this difference.
Field Remedy
1) Press Settings/Registration > Adjustment/Maintenance > Adjust Image Quality > Fine Adjustment Zoom.
2) Press "-" or "+" to adjust the percentage (%) > press OK.
If you want to adjust only the X (horizontal) or Y (vertical) direction, press "-" or "+" to enter a value for that direction only.
1.1.2 Faulty Feeding
1.1.2.1 Wrinkle
1.1.2.1.1 Wrinkles due to thin paper used in a low humidity environment
0031-8692
[ Verified by Canon Inc. ]
Symptom
When a thin paper had been left in a low humidity is used, wrinkles [a] may occur at the center of the sheet.
The arrow [c] indicates the direction of feeding.
Cause
When paper is left in a low humidity environment, moisture is lost from the edges of sheet of paper. As a result, difference of amount of moisture is generated
between the edge and the center of the sheet, and this makes the edge of the sheet curled upwards.
When curled paper is entered in the fixing assembly the symptom occurs.
Thin paper is likely to curl up and induce the symptom.