Canon iR C6800 Series Service Manual page 901

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13.3.2.3.3 Uneven Density in Halftone Images

In a high temperature/humidity environment, the symptom can start to occur relatively early (around 100,000

images) after replacement of the primary charging wire/cleaning pad.

The uneven density tends to be conspicuous in color half tone images.

The uneven density tends to be found at the same area in all colors.

The symptom is caused by dirt on the primary charging wire or the dust blocking glass.

In particular, the cleaning pad tends to start deteriorating early (about 100,000 images) in a high temperature/

humidity environment.

Field Remedy

1) Clean the dust blocking glass.

2) If the primary charging wire is approaching the end of its life, replace it. Be sure also to replace the cleaning pad

at the same time.

3) If the area of friction of the cleaning pad is worn or deformed, replace th pad.

4) Execute the following in service mode to clean the charging wire: COPIER>FUNCTION>CLEANING>WIRE

The estimated life of the primary charging wire is 500,000 images: the cleaning pad is 500,000 images (however, in

a high temperature/humidity environment, 100,000 images).

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