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 suitedto the output of the transfer charging level control signal (HVTTC) to the transfer chargingassembly.If an excess corona current flows from the transfer charging assembly because ofchanges in the environment or the like, the return signal to the comparison circuit willincrease and the output will decrease, causing the corona current from the transfercharging assembly to decrease and thereby controlling it to a specific level at all times.COPYRIGHT © 1997 CANON INC. CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 4 IMAGE FORMATION SYSTEM4-14
