D. Controlling the Primary/Transfer Corona Current and the GridBias1. OutlineFigure 4-104 shows the circuit used to control the primary/transfer corona currentand the grid bias of the primary charging assembly, and the circuit has the followingfunctions:q Turning on and off the primary/transfer corona current.w Keeping the primary/transfer corona current to a specific level.e Turning on and off the grid bias.Figure 4-104CHAPTER 4 IMAGE FORMATION SYSTEMCOPYRIGHT © 1997 CANON INC. CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON) 4-5PTON*J114-8BJ401-6-13B -1DCcontrollerPCBRemotecircuitGRCONT ComparatorcircuitAC drive circuitDrive circuitVoltage controlcircuitCurrent cortrolcircuitHigh-voltage transfer (HVT)Primaryhigh-voltagetransformerTransfer high-voltagetransformerSiPrGrTr
