Canon imagePRESS C800 Series, Troubleshooting Manual

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Chapter 1
1-20
2-7) Place the output third test page face down on the platen glass with the black strip to the rear and then press "Start Scanning".
[Reference]
Make sure to place the last output if the multiple third test pages are output. To perform more precise full adjustment, you can increase the number of sheets for test
pages in "Number of Sheets to Output for Test Page". In this case, multiple third test pages are output.
2-8) Remove the third test page from the platen glass.
[Caution]
After changing the settings, make sure to perform the automatic gradation adjustment first, and then perform the color balance adjustment as the color balance may
become unstable.
1.1.1.5.2 Roller marks
0031-6958
[ Verified by Canon Inc. ]
Symptom
If paper is picked up from the cassette 1 or 2 under a high humidity environment, roller marks may appear in the area at 81mm[a]/258mm[b]/354mm[c] from the
leading edge of the first page of halftone image.
Roller marks in the area at 354mm[c] may appear only when paper is picked up from the cassette 2.
The arrow [d] indicates the feed direction.
Cause
After print started, the first sheet of paper stands by at the registration assembly.
If the areas of the sheet touching the rollers are deformed while the idle activity by the sheet, toner will not be transferred evenly from the ITB and that leads to the