Xerox 8825 Service Manual page 172

Plug
ESV Channel
Figure 2 Removing the Plug
NOTE: Failure to center the probe will cause incorrect V-LO readings.
NOTE: Run LED Test 9-21.5 to verify that all appropriate LEDs illuminate. Also verify that the
Electrometer probe is located within the center 2 inch (50 mm) wide illuminated section of the
LED bar.
12. Close the Image Module, the Top Cover, and the Front Door.
13. Enter diagnostics.
14. Ensure that V-HI is within specification.
a. Enter [0921-2] for the check and adjustment.
b. Turn on the electrometer.
c. The average meter reading should be
d. If required, adjust V-HI using the Previous / Next buttons.
e. Press the Enter button in order to store the value in NVM.
f. Turn off the electrometer.
15. Ensure that V-LO is within specification.
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.
Repairs and Adjustments
ADJ 9.2
Image Module
-600 +15/-5 volts (-585 to -605 volts).
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.
Table 1 Average Light Output Values
Bar # Value
1 .75
2 .77
3 .68
4 .74
5 .80
6 .75
7 .74
8 .75
9 .79
10 .61
11 .65
12 .58
13 .71
14 .62
15 .69
16 .70
17 .70
18 .74
19 .71
20 .79
21 .67
22 .92
23 .76
24 .83
25 .79
26 1.05
27 1.05
28 1.05
29 1.10
30 1.13
31 1.02
32 .97
33 1.03
34 1.00
01/02
4-104 8825/8830 Printer