Specifications

9.3 BIAS VOLTAGE ADJUSTMENT
When: 1. The image is blurred even though the image
density in black solid areas is acceptable.
2. Dirty background. The problem is not caused
by excess toner and cannot be solved by
adjusting light intensity.
Purpose: To improve the copy image
Measure: SP Mode #37
How: Changes the bias voltage while the image area on
the drum is being developed.
SP Mode #37
Data 01234
Bias Voltage [V] V0 V0 + 40 V0 + 20 V0 - 20 V0 - 40
Image Density Normal Darkest Darker Lighter Lightest
NOTE: V0 is the standard voltage applied to the development roller.
1. Make a copy after adjusting the light intensity.
2. If the image is blurred:
Decrease bias voltage by one step and readjust light intensity.
If the background is dirty:
Increase bias voltage by one step and readjust light intensity.
1 December 1990
5-93