Sharp MX-2314N Service Manual page 377

2) Insert a small screwdriver or a hex wrench into the hole in the
shaft cover on the opposite side of the OPC drum drive gear,
and push it in the arrow direction to pull out the drum shaft.
In order to improve the image quality, the backlash between
the OPC drum shaft and the OPC drum is minimized in this
machine. To pull out the OPC drum shaft, therefore, follow the
above procedure.
Note that conduction grease is applied to the shaft on the OPC
drum drive gear side. Be careful not to attach conduction
grease to the OPC drum surface.
3) Remove the drum.
When assembling the drum shaft, set the projection with an
opening for the drum drive gear to the position shown in the
figure, and push the drum shaft inside. Then, rotate the drum
drive gear in the arrow direction (counterclockwise) to lock it.
Check to confirm that the projection of the drum drive gear is
securely in the drum holder.
MX-3114N DISASSEMBLY AND ASSEMBLY 10 – 31
Note for servicing the OPC drums
1. Prevent contamination
Note
• Be careful not to leave 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.)
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) If the OPC drum is subject to stress by being exposed to
strong light, it may be recovered by leaving it in a dark and cool
place.
If it may not be recovered, replace it with a new one.