Canon imageRUNNER ADVANCE 8105 Series Service Manual page 175

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Technology > Fixing > Servicing > Troubleshooting
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Image failure due to the temperature rising at the edge of the Fixing
Roller (crepe mark)
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Technology > Fixing > Servicing > Troubleshooting
<Location of Trouble>
Fixing Roller, Pressure Roller
<Cause>
This is the symptom which image error like crepe mark occurs when temperature at the
edge of the Fixing Roller rises.
When the temperature rising at the edge occurs, the edge of the Pressure Roller made with
rubber expands, giving the following influences on papers.
Feed speed at the edge is increased, compared with the speed at the center.
Tension is applied in the direction of both edges.
As it get close to the trailing edge, fixing is performed while a paper is distorted, causing an
image error.
<Conditions>
Although all images have a possibility to have the error because the cause is temperature
rising at the edge, the symptom is mainly significant with halftone images. The following
shows estimated error occurrence with halftone image.
When printing 200 sheets or more of small size paper continuously (approx. 1000 sheets in
A4 size)
When printing a large size sheet right after printing 100 sheets or more of small size paper
continuously
<Field Remedy>
1) Go through the following: Settings/Registration > XXX > XXX; and turn ON the item.
By doing so, image error (crepe mark) will not occur.
With this setting, temperature difference between the center and the edge of the Fixing
Roller is detected, and start idle rotation when temperature rising at the edge tends to
occur.
During idle rotation, paper feed is stopped to keep constant temperature on the Fixing
Roller, so the productivity is reduced.
2) Switching the image priority mode level.
When the image priority mode is specified, productivity may be extremely reduced
depending on use conditions (paper size, paper type, and print image).
In such a case, change the level of production reduction by the following service mode.
COPIER >OPTION >IMG-FIX > FIX-IMGLV
F-2-153 F-2-153
[Setting values] 0: xxx, 1: xxx, 2: xxx
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