B245/B276/B277/B268/B269 Service Manual 18-Jan-06
51
Replacement and Adjustment
General Cautions
Do not turn off the main switch while any of the electrical components are active. Doing so
may result in damage to units (such as the PCU) as they are pulled out or replaced.
PCU (Photoconductor Unit)
The PCU consists of the OPC drum, charge roller, development unit, and cleaning
components. Observe the following precautions when handling the PCU.
1. Never touch the drum surface with bare hands. If the drum surface is dirty or
if you have accidentally touched it, wipe it with a dry cloth, or clean it with
wet cotton and then wipe it dry with a cloth.
2. Never use alcohol to clean the drum. Alcohol will dissolve the drum surface.
3. Store the PCU in a cool dry place.
4. Do not expose the drum to corrosive gases (ammonia, etc.).
5. Do not shake a used PCU, as this may cause toner and developer to spill
out.
6. Dispose of used PCU components in accordance with local regulations.
Transfer Roller
1. Never touch the surface of the transfer roller with bare hands.
2. Be careful not to scratch the transfer roller, as the surface is easily
damaged.
Scanner Unit
1. Use alcohol or glass cleaner to clean the exposure and scanning glass.
This will reduce the static charge on the glass.
2. Use a blower brush or a water-moistened cotton pad to clean the mirrors
and lenses.
3. Make sure to not bend or crease the exposure lamp’s ribbon cable.
4. Do not disassemble the lens unit. This will cause the lens and copy image to
get out of focus.
5. Do not turn any of the CCD positioning screws. This will put the CCD out of
position.
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