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1 October, 1999
4. SERVICE TABLES
4.1 GENERAL CAUTION
Do not turn off the main switch while any of the electrical components are active.
Doing so might cause damage to units, such as the PCU, when they are pulled out
of or put back into the machine.
4.1.1 PCU
The PCU consists of the drum, development unit, charge roller unit, and cleaning
unit. Follow the cautions below when handling a PCU.
1. Never touch the drum surface with bare hands. When the drum surface is
touched or becomes dirty, wipe it with a dry cloth or clean it with wet cotton.
Wipe with a dry cloth after cleaning with the cotton.
2. Never use alcohol to clean the drum; alcohol dissolves the drum surface.
3. Store the PCU in a cool dry place away from heat.
4. Never expose the drum to corrosive gases such as ammonia gas.
5. Never shake the used PCU. Doing so may cause toner and/or developer to
split out.
6. Dispose of used PCU in accordance with local regulations.
4.1.2 TRANSFER ROLLER UNIT
1. Never touch the transfer roller surface with bare hands.
2. Take care not to scratch the transfer roller as the surface is easily damaged.
4.1.3 LASER UNIT
1. Do not loosen the screws that secure the LD drive board to the laser diode
casing. Doing so would throw the LD unit out of adjustment.
2. Do not adjust the variable resistors on the LD unit, as they are adjusted in the
factory.
3. The polygon mirror and F-theta mirror are very sensitive to dust. Never open
the optical housing unit.
4. Do not touch the glass surface of the polygon mirror motor unit with bare
hands.
4-1
GENERAL CAUTION
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