Canon imagePRESS C1 Service Manual - page 754
Chapter 14
14-19
F-14-24
Reference: The S-B Board PCB processes scanner image (i.e., performs resolution conversion, image rotation, and compression/ decompression).
Cause
Because of poor connection between the S-B Board PCB and the Main Controller PCB, this machine failed to process images red by the scanner normally,
causing the faulty image.
Field Remedy
1. Re-fit the DDI-S serial cable.
2. Re-fit the S-B Board PCB mounted on the Main Controller PCB.
3. If the symptom still occurs, wipe the terminal of the S-B Board PCB with lint-free paper impregnated with alcohol.
FM2-7362 S-B Board PCB Assembly
14.3.1.7.2 Hue variation occurs: OFST value (target value) for PASCAL is changed
0015-7355
imagePRESS C1 P / imagePRESS C1 / Color Image Reader-H1 / imagePRESS C1+ (Printer) / imagePRESS C1+
[ Inspected by Canon Inc. ]
Description
During servicing, the value for the service mode [OFST] under [PASCAL] was changed to adjust the density of each color, and then auto gradation correction
was performed. However, this caused hue variation.
Cause
Changing the value for [OFST] also changed the target value for the auto gradation correction, causing a failure in adjusting the density of each color properly.
This made tones including half tone deviate, causing hue variation.
Note: The factory changes the adjustment (OFST) value of discrete machines to improve the density detection accuracy of the Reader. When this value is
changed, the density measurement will not be performed properly. Therefore, be sure not to change this value. This is true of not only this model but also all
the other color models.
Field Remedy
1. If the value for [OFST] was changed in service mode, reset it by referring to the value (value at time of factory shipment) in the service label on the backside
of the front cover of the Reader.
2. Perform the auto gradation correction.
3. When changing the density of each color, make adjustments in the following service mode: [Service mode > COPIER > Adjust > COLOR].
Reference: After replacing the Reader Controller PCB or clearing the RAM, be sure to input the value for [OFST] under [PASCAL] as well as the other
relevant values.
14.3.1.7.3 Faulty gradation occurs with machine equipped with DADF-R1 after auto gradation adjustment (full adjustment)
0015-9383
imagePRESS C1 P / imagePRESS C1 / Color Image Reader-H1 / imagePRESS C1+ (Printer) / imagePRESS C1+
[ Inspected by Canon Inc. ]
Description
In a machine equipped with a DADF unit, when placing a printout for calibration generated at time of executing the auto gradation adjustment on the
copyboard glass, and then closing the DADF unit, the printout was scanned in a state in which it had a gap with the copyboard galss, causing faulty gradation.
Cause
The feed belt of the DADF unit failed to hold the printout firmly on the copyboard galss. As for the quick adjustment (one of the auto gradation adjustment
modes with neither generating a test print printout nor scanning the printout), the difference in the gradation adjustment method prevents the same symptom
from occurring.