6
6
6-13
6-13
Troubleshooting > Troubleshooting Items > Image Failure > Trace of Upstream Brush
Troubleshooting > Troubleshooting Items > Image Failure > Trace of Upstream Brush
■
Trace of Upstream Brush
Feed direction
Feed direction
[Cause]
As the residual toner accumulated on the Upstream Brush increases, uneven potential occurs
between the Upstream Brush and the Drum due to partial discharge so that the drum cannot
be charged evenly. For this reason, toner adhesion occurs at blank area.
[Condition]
It occurs when the life of the Drum Unit is advanced in a high duty/high CV environment.
F-6-10
F-6-11
[Field Remedy]
Perform the field remedy by referring to the following flow chart.
Trace of Upstream Brush
occurs.
Decrease the level of Upstream
DC bias by 1.
(Lv2)COPIER>ADJUST>HV-PRI>
USUB-xDC
Is trace of Upstream
Brush disappeared?
Decrease the amount of
toner deposit.
(Lv2)COPIER>OPTION>
IMG-MCON>TNR-DWN
Is ghost disappeared?
END
Is ghost disappeared?
YES
NO
Yes
NO
YES
NO
Replace the Drum Unit of
the specified color.
Return the service mode setting value
to the default.
Specify the color with which
ghost occurs by visual check.
* In case of color, x represents Y-color.
In case of Bk, it represents K-color.
CAUTION
In case that the Drum Unit is replaced, return the setting value to the default.
F-6-12
