Xerox 8830 Service Manual page 186

11. Position the Electrometer Probe to measure the
voltage on the drum.
a. Install the probe wing onto the Electrometer
Probe. Ensure that the window of the wing
is centered over the window of the probe.
b. (Figure 2): Remove the plug from the side
of the Image Module.
c. Slide the Electrometer Probe through the
hole, into the channel.
d. Determine the center of the Image Module
and push the probe along the channel until
the probe window is centered on the Image
Module.
NOTE: Failure to center the probe will cause
incorrect Vlow readings.
Figure 2. Removing the Plug
ADJ 9.2
12. Close the Image Module, the Top Cover, and the
Front Door.
13. Enter diagnostics.
14. Ensure that V is within specification.
HIGH
a. Enter [0921-2] for the check and adjustment.
b. Turn on the electrometer.
c. The average meter reading should be -600
+15/-5 volts (-585 to -605 volts).
d. If required, adjust VHIGH using the Previous
/ Next buttons.
e. Press the Enter button in order to store the
value in NVM.
f. Turn off the electrometer.
R3013K
1/98
4-102
15. Ensure that V is within specification.
LOW
a. Enter [0921-3] for the check and adjustment.
b. Set the Duty Cycle to 15% using the
Previous / Next buttons.
c. Turn on the electrometer.
d. Record the value on the DMM.
NOTE: In the following step, if no change occurs,
ensure that the probe is centered.
e. Press the Previous button to decrease the
Duty Cycle value in 1% increments. Pause
three seconds at each reading until the value
changes 10 Volts.
f. Press the Next button twice to increase the
duty cycle value by 2%.
g. Press the Enter button in order to store the
value in NVM.
h. Turn off the Electrometer.
8830