Ricoh FW 810, Service Manual

Page: 135 / 170

4.3 DRUM CURRENT ADJUSTMENT
NOTE: a) 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 at the factory.
b) Drum current adjustment may be required when there are
problems with paper separation, incomplete toner transfer, and/or
image density.
c) Make sure that the main switch is turned off when you change the
range on the digital multimeter. If it is not, the multimeter may be
damaged.
4.3.1 Preparation
1. Turn off the main switch and remove the following:
a) Pick-off pawl unit
b) Upper registration cover
c) Drum
2. Install the current measuring drum. Position the drum with the connector
to the right side. The wires should be positioned as close as possible to
the development unit so that they are not in the way of any corona units.
3. Close the middle unit.
4. Connect the lead wires and the digital multimeter lead (current measuring
position).
5. Connect the digital multimeter lead (COM position) to the machine
ground.
6. Turn on DIP switches 101-7 and 101-8.
6 January 1990
5-13