Canon GP405 Service Handbook page 89

<HV-STS>
Indicates the measurements of voltage and current.
Level 3
PRIMARY Current applied to the primary charging roller.
BIAS Developing bias Dc value
TR-V ATVC detection voltage
If the level of 'TR-V' is 30 to 100, transfer is
assumed to be normal.
Description
CHAPTER 4 SERVICE MODE
Remarks
Unit: µA; about 200 µA
Unit: V
Unit: V
4-21