Canon GP335 Service Manual page 138

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CHAPTER 6 IMAGE FORMATION SYSTEM

4. Correcting the Application Voltage Level (ATVC control)

The transfer charging efficiency varied according to changes in humidity or deterioration of the

transfer roller. A reference current is applied each time the Copy Start key is pressed to measure the

degree of voltage output for correction as follows:

A reference current is applied during initial rotation after the Copy Start key is pressed.

The transfer voltage is detected and returned to the PW-CPU on the composite power supply

The PW-CPU computes an optimum application voltage.

Transfer charging is started using the optimum application voltage.

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