Determining Primary Current - Canon iR5000 Service Manual

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2.2 Determining Primary Current

To measure the dark area potential (VD) for the first time after the power switch is turned

on, the current used during previous measurement is let to flow, and the potential sensor is

used to measure the surface potential of the drum.

The DC controller PCB compares the surface potential of the drum against the target po-

tential; if the measured potential is ±6 V or higher than the target value, the primary current

is corrected, and the potential is measured once again. The potential is measured as many as

eight times, and the primary charging current is corrected as many as eight times.

Fixing assembly temperature195˚C

Potential sensor

Primary charging

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CANON iR5000/iR6000 REV.0 JULY 2000

CHAPTER 4 IMAGE FORMATION SYSTEM

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