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TECHNICAL SERVICE BULLETIN
CUSTOMER SERVICE GROUP
06/13/97
BULLETIN NUMBER:
6645/6655/6665 - 040 RESSIUED
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APPLICABLE MODEL: FT6645/6655/6665
SUBJECT: SHORT BLACK LINES ON DRUM (MEDAKA)
SYMPTOM:
Short black lines appear on the drum surface.
CAUSE:
Additives contained in particular varieties of copy paper cause toner to stick to the drum. This occurs most
often when the copier is operated in a warm environment, for example, when the room temperature is high,
or when the copy volume is high (especially when duplex copying).
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SOLUTION:
To increase drum cleaning efficiency, a new style Cleaning Brush has been developed for use with machines
exhibiting the above mentioned symptom. The new style Cleaning Brush (AD042032) contains fewer
bristles, however, the diameter of the bristles have been increased. When installing the new Cleaning Brush
the developer should also be replaced because the paper dust in the developer may cause Medaka.
Replacing the drum may also be necessary, because, it may be difficult to completely remove all the
adhered toner from the drum surface.
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