Canon iR C6800 Series Service Manual page 903

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13.3.2.3.5 Uneven Density On Rough Textured Paper

When a Bk solid image is copied on rough textured paper (not of a recommended type), the ups and downs on the

surface of the paper can cause a shortage of transfer current, causing white spots and uneven density in images.

Field Remedy

Execute the following service mode to decrease the pre transfer charging bias:

COPIER>ADJUST>HV TR>PRE TR; set it to '250'.

This symptom is most conspicuous when a Bk solid image is copied on rough textured paper (not of a recommended

type). Advise the user to avoid rough textured paper.

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