Canon NP6251 Service Manual page 128

CHAPTER 4 IMAGE FORMATION SYSTEM
b. When the Transfer Corona Current Output Is ON.
HVTTC is less than about 11 V.
DCON is '1'.
Comparator circuit goes ON.
Variable width pulse oscillator goes ON.
Drive circuit goes ON.
Primary high-voltage transformer goes ON.
The above condition causes the high-voltage transformer to send high voltage suited
to the output of the transfer charging level control signal (HVTTC) to the transfer charging
assembly.
If an excess corona current flows from the transfer charging assembly because of
changes in the environment or the like, the return signal to the comparison circuit will
increase and the output will decrease, causing the corona current from the transfer
charging assembly to decrease and thereby controlling it to a specific level at all times.
4-14
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CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)