CHAPTER 8 ADFCOPYRIGHT © 1999 CANON INC. CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 8-15H. Controlling the Belt Motor1. OutlineFigure 8-122 is a diagram showing the control circuit for the belt motor (M2).The belt motor is a 4-phase control stepping motor.The CPU (Q1) on the ADF controller PCB sends control pulse signals (A, A*, B, B*) to themotor driver (Q4).In response, the motor driver changes the output timing of the pulse signals (MA, MA*, MB,MB*) used for driving the motor to rotate the belt motor clockwise or counterclockwise.The motor driver is equipped with a limiter function used to keep the motor supplied with aspecific current so that current greater than specified will not flow.If loads large enough to activate the limiter function occur in succession, the belt motor cannotrotate as specified, possibly leading to feeding faults. Any feeding fault will cause the ADF con-troller to flash the Jam indicator on the controller and stop the belt motor at the same time.Figure 8-122+24VQ1CPU M1AA*BB*MAMA*MBMB*ADF controller PCBQ4MotordriverBelt motor
