Ricoh FT4480 Field Service Manual page 122

- DRUM CURRENT ADJUSTMENT -
NOTE: The drum currents vary with environmental conditions such as humidity and
atmospheric pressure. Generally it is not necessary to adjust the drum
currents because they have already been adjusted for a range of environments
in the factory.
Drum current adjustment may be required when there are problems with paper
separation, incomplete toner transfer, or image density.
Make sure that the main switch is turned off when you change the
CAUTION: -
range on the digital multimeter. If it is not turned off, the multimeter
may be damaged.
-
High voltage is applied to the corona wires when the main switch is
turned on.
I. PREPARATION
1. Turn off the main switch and remove the following parts:
- Development unit
- Charge corona unit (1 screw)
- Drum stay (1 screw)
- Toner collection bottle
- Cleaning unit
- Drum flange
- Drum - should be covered with a shielding sleeve
- Drum guide
- T/S corona unit
3-71
15 MARCH 1987