01/02
4-104
8825/8830 Printer
ADJ 9.2
Repairs and Adjustments
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 -600 +15/-5 volts (-585 to -605 volts).
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.
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.
Image Module
Plug
ESV Channel
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
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