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7-2 DRUM CURRENT
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 ad-
justed 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.
Make sure that the main switch is turned off when you change
c)
the range on the digital multimeter. If it is not, the multimeter may
be damaged.
Preparation
I
Turn off the main switch and remove the following parts:
1.
a)
development unit
charge corona unit
b)
drum stay
c)
d)
cleaning unit
e)
drum flange
f)
drum
drum guide
9)
T/S corona unit.
h)
2. Clean
or replace each corona wire, and clean the corona units and the
cleaning unit.
3. Actuate the door switch.
4. Remove the rear cover (2 screws).
5. Turn on DPS 101-5 (Test Mode) on the main PCB.
NOTE: The fusing unit does not warm up when in Test Mode.
ADJUSTMENT
3-53
I
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