developing leakage
1.1.4. White Spot due to the developing leakage (foreign material)
(1) Symptom
White spots occur on the solid image.
← Paper feed direction
(2) Cause
Foreign material which is conductive attaches to the surface of the developing roller and
abnormal discharge occurs.
A conductive foreign material attaches to the developing roller surface and is conveyed to the
developing nipping part. Then, it is affected by the developing AC bias, abnormal discharge
occurs against the photoconductor drum. This appears as white spots.
(3) Solution
While checking the image, reduce the value of the Develop AC Bias Fine Adj.
Service Mode →[Process Adjustment]→[Process Fine Adjustment]→[Develop AC Bias Fine
Adj.]
When the setting is changed, conduct gamma automatic adjustment.
Note:
Background, uneven density or carrier attachment may occur. Therefore, check the image
when changing the settings.
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