Ricoh A095, Руководство по обслуживанию

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BULLETIN NUMBER: 6645/6655/6665-038 04/17/95
APPLICABLE MODEL: FT6645/6655/6665
SUBJECT: VERTICAL BLACK LINES ON COPIES / SCRATCHED DRUM
SYMPTOM:
Carrier (developer) scratches the OPC drum resulting in vertical black lines on copies.
CAUSE:
Occasionally, a few carrier particles adhere to the OPC drum and
are collected by the cleaning unit. This does not affect the drum
and is considered normal operation. However, very rarely, carrier
particles pass through the cleaning unit and are caught by the
development unit entrance seal where they are pressed against
the OPC drum as shown. If the machine runs in this condition for
a long time, the carrier may scratch the OPC surface resulting in
vertical black lines on copies.
FIELD COUNTERMEASURE:
To reduce the pressure applied to the carrier, the Entrance Seal
has been modified as shown. Because of the unique
shape of the new style Entrance Seal, it absorbs the
fluctuating (excess) pressure of the developer so that
there is not enough pressure to scratch the OPC
surface.
NOTE: Refer to the Field Service Manual, page 5-43,
for the Entrance Seal replacement procedure.
UNITS AFFECTED:
All FT6645/6655 copiers manufactured prior to Serial Number A3354470106 and A3364470002 respectively
are susceptible to the above mentioned symptom.
ORDERING PROCEDURE:
Ricoh Corporation will automatically ship one new style Entrance Seal (A0963098) at no charge for use on
100% of all FT6645/6655 copiers manufactured prior to Serial Number A3354470106 and A3364470002
respectively (see Temporary Field Countermeasure, page 2) based on Ricoh’s Equipment Shipped Records.
Continued...
OPC Drum
Developer
Pressure
Carrier
Old
New
OPC Drum
OPC Drum
Entrance Seal Entrance Seal