8.2.2 SP Bias Settings
When:
1. The image is blurred in ADS mode, even though the image density in
black solid areas is acceptable.
2. Dirty background in ADS mode. The problem is not caused by
excess toner and cannot be solved by adjusting the light intensity.
Purpose:
To get the proper image density
Method:
VRB on the high voltage supply board, SP33, SP34
How it works:
Changes the bias voltage while the image area on the drum is being
developed.
NOTE:
SP34 can be changed by customers.
- SP33 Image Bias Adjustment (Manual ID Mode) -
Setting 01234
Bias Voltage
Change [V]
±
0
+40 +20 –20 –40
Image Density Normal Darkest Darker Lighter Lightest
1 step = 0.5 V (120 V machines) or 1.0 V (230 V machines)
- SP34 Image Density Adjustment (ADS Mode) -
Setting 01234
Bias Voltage
Change [V]
±
0
–40 +40 –40 +40
Exposure Lamp
Change
±
0
±
0
±
0
+4 steps –4 steps
Image Density Normal Lighter Darker Lightest Darkest
1 step = 0.5 V (120 V machines) or 1.0 V (230 V machines)
Replacement
Adjustment
20 December 1996 COPY QUALITY ADJUSTMENT
6-53
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