Sharp MX-4100N Service Manual page 320

(Note for servicing the OPC drums)
1. Prevention of oily dirt attachment
[Note]
• Be careful not to attach fingerprints or oily dirt on the OPC drum
surface. (Keep the unit away from oils and dust.)
• When replacing the OPC drum, cover the OPC drum with the
protection sheet and hold the protection sheet.
If it is required to hold the OPC drum directly, use enough care
not to touch the cleaning blade area, 5mm inside from both
edges of the OPC drum. (If a fingerprint or oily dirt is attached to
the cleaning blade area of the OPC drum, the cleaning blade
may flip.)
OPC DRUM
5mm
[Countermeasures]
If a fingerprint is attached to the OPC drum surface erroneously,
perform the following countermeasures.
1) Use dry cloth to clean and remove the dirt.
2) Apply stearic acid powder to prevent blade flip.
[Check method]
Check to confirm that the OPC drum is free from fingerprints or oily
dirt and that the cleaning blade is completely cleaned by the follow-
ing method.
• Make a print of a half tone image on all the surface of A4 (11" x
8.5") paper, and check the printed paper for any abnormality in
the image.
2. Prior exposure prevention
[Note]
• Avoid servicing in a place where there is strong light.
• Do not expose the unit to light for a long time.
• Cover the OPC drum with light-blocking material. (When using
paper, use about 10 sheets of paper to block light.)
[Countermeasures]
If the OPC drum is erroneously exposed to light too much (prior
exposure), perform the following countermeasures.
1) Print half tone images on the whole surface of A4 (11" x 8.5")
paper, and check to confirm that there is no irregular density
area in the previously exposed section.
2) Damages due to prior exposure may be recovered by keeping
the OPC drum for several hours. If, however, image are not
recovered, replace the OPC drum.
5mm
CLEANING BLADE
MX-5001N MAINTENANCE 8 – 5
1) Open the front cover.
2) Remove the waste toner box.
Maintenance: Check at every 150K. (Replace as necessary.)
3) Remove the MC cleaner rod.
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