Ricoh FT 4015 Service Manual page 179

20 December 1996
8.2.2 SP Bias Settings
When: 1. The image is blurred in ADS mode, even though the image density in
2. Dirty background in ADS mode. The problem is not caused by
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
Bias Voltage
Change [V]
Image Density
1 step = 0.5 V (120 V machines) or 1.0 V (230 V machines)
- SP34 Image Density Adjustment (ADS Mode) -
Setting
Bias Voltage
Change [V]
Exposure Lamp
Change
Image Density
1 step = 0.5 V (120 V machines) or 1.0 V (230 V machines)
black solid areas is acceptable.
excess toner and cannot be solved by adjusting the light intensity.
0
±0
Normal
0
±0
±0
Normal
COPY QUALITY ADJUSTMENT
1 2
+40 +20
Darkest Darker
1 2
–40 +40
±0 ±0
Lighter Darker
6-53
3 4
–20 –40
Lighter Lightest
3 4
–40 +40
+4 steps –4 steps
Lightest Darkest