CHAPTER 8 ADFCOPYRIGHT © 1999 CANON INC. CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)8-14G. Controlling the Pickup Motor1. OutlineFigure 8-121 is a diagram of the control circuit for the pickup motor (M2).The pickup motor is a DC motor.The CPU (Q1) on the ADF controller PCB sends the motor drive signals PM0 and PM1 to themotor driver (Q5). The pickup motor rotates clockwise or counterclockwise according to the com-binations of the states of these two signals. (Table 8-102 shows how the pickup motor rotates foreach combination.)The motor driver is equipped with a limiter function, preventing overcurrent from flowing intothe motor. When an overcurrent occurs, the limiter function cuts off the motor drive current,thereby preventing damage to the motor.When the limiter function is activated, the pickup motor cannot rotate as controlled, possiblyleading to pickup faults. Any pickup fault causes the ADF controller to flash the JAM indicator onthe copier and stop the pickup motor at the same time.Figure 8-121Table 8-102+24VQ1CPUM2PM1PM0PickupmotorADF controller PCBQ5MotordriverPMRD1PMRD1*Pickup rollerrotationBrakedPicking upDeliveringAt reset (free)Motor drivesignal (PM0)‘1’‘1’‘0’‘0’Motor drivesignal (PM1)‘1’‘0’‘1’‘0’
