T
echnical
B
ulletin PAGE: 1/6
Model:
Aries-P1.5/C1.5, AG-P1/C1, AGL-P1/C1
Date:
29-Nov-13
No.:
RM077099
Subject:
Summary of OPC drum related problems
Prepared by:
J. Kobayashi
From:
PP Tech Service Dept., 1st PP Tech Service Sect.
Classification:
Troubleshooting
Mechanical
Paper path
Product Safety
Part information
Electrical
Transmit/receive
Other ( )
Action required
Service manual revision
Retrofit information
Tier 2
General
This bulletin summarizes the information announced in previously released RTBs for
image quality problems originating in the OPC drum. Details are described on how the
drum wears along with the recommended actions to avoid unnecessary drum
replacements when encountering problems originating in other components. It is
important to take note that images are affected at a 314 mm interval (= drum
circumference), if the image quality problem is caused by drum scratches.
How do drum scratches occur?
Cause 1: Drum scratches caused by cleaning components
Contact between the cleaning components and OPC drum in the repeated cleaning
operation wears the drum surface over time. As shown in the illustration below, the drum
used for Aries consists of 5 layers. While the topmost overcoat layer is hard and durable,
the charge transfer and charge generation layers are much more delicate. Once the
overcoat layer is removed through abrasion, the two layers beneath will wear out very
quickly, resulting in abnormal images. This however will not occur for 2,400kp, which is the
prescribed drum life, provided that the machine is used under normal conditions.
Overcoat layer
Under layer
Base board
Abrasion
Charge transfer
layer
Charge gene-
ration layer
Drum (shaft direction)
Front Rear
Drum Voltage
Location of the abnormal image (vertical
streaks) correspond to the spots where
abrasion is severe on the drum surface.
Abrasion
High
Low
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