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2. Enter the Service Mode, select the Adjustment Mode 0 (Sub Mode No.4), and select the Item
No.CA (Constant / Variable control of Developer Bias).
If this item is set to "1" (Variable control), set it to "0" (Constant control) before starting the
adjustment.
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NOTE
If No.CA is set to "1", the Bias is occasionally adjusted to the best value according to the
temperature detected by the temperature sensor. (between 10 to 20 degrees centigrade)
This situation is not suitable when the output from the BIAS PCB is to be checked.
The Bias will be always same regardless of the temperature if No.CA is set to "0", which is
suitable for checking.
3. Select the Special Mode (Sub Mode No.9), and select the Item No.8 (Developer Bias
[Negative] Adjustment Mode).
4. Press the [ENTER] Key to output the Negative Developer Bias from BIAS to each roller of
Developer Unit.
Measure the voltage with multi-meter.
Press the [ENTER] Key again to stop outputting when measurement is finished.
Standard value of the Negative Developer Bias to the Developer Roller is -250V +/-3V.
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