CHAPTER 4 IMAGE FORMATION SYSTEMCOPYRIGHT © 1999 CANON INC. CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-9B. Operation1. Switching the AC Component of the Developing Bias ON/OFFThe square wave generator operates continuously when the copier is switched ON.a) When ACBON=1AC bias switch circuit goes ON.Output from the square wave generator is cut off.As a result, AC bias is not supplied to the developing cylinder.b) When ACBON=0The AC bias switch circuit goes OFF.As a result, the output of the square wave oscillator goes to the T1 drive circuit. This causes theAC high-voltage transformer to generate a 1300V AC bias, which is supplied to the developingcylinder.Also, the output of the AC high-voltage transformer is rectified and supplied to the staticcharge eliminator (approx. 3.2 kV).
