Ricoh FT4480 Field Service Manual page 42

- Charge Corona -
Clean the corona wires with a dry cloth or by sliding the corona unit
1.
in and out. Do not use emery paper or any solvent for wire cleaning.
2. Do not touch the corona wires with oily hands. Oil stains may cause
white bands on copies.
3. Make sure that the corona wires are correctly positioned between the
cleaner pads and there are no threads on the casing.
4. When adjusting the drum current, always make sure that the axis of
drum shoe is aligned with the corona wire.
5. The corona wire height should be adjusted only when:
a) The front end block is replaced.
b) The drum charge current is uneven.
- Optics -
Do not adjust the following parts:
1.
a. Scanner Guide Plate
b. Fourth Mirror Angle Adjusting Screw
c. Lens Home Position Sensor
d. Lens unit rails
The lens home position sensor does not have a convenient adjusting
2.
procedure. When replacing the sensor, mark the position of the sensor
bracket before removing it, and adjust the fine position of the sensor
by checking the copy image (horizontal magnification and focus).
3. Do not bend or damage the lens support plate or the mylar strip.
4. Launa oil or an equivalent oil should be used
following:
• Scanner Guide Rod (cleaning)
• Scanner Guide Rod Pads (Lubrication)
• Scanner Guide Plate (Lubrication/Cleaning)
CAUTION: Do not use any other kind of oil.
5. Clean the exposure glass with glass cleaner and a dry cloth to
reduce static electricity on the glass.
Clean the mirrors with water or silicone cloth only.
6.
2-15
15 MARCH 1987
to lubricate or clean the