CHAPTER 8 ADFCOPYRIGHT © 1999 CANON INC. CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)8-2B Basic Construction1. Outline of the Electric CircuitryThe ADF’s major electrical mechanisms are controlled by the CPU on the ADF controllerPCB.The CPU on the ADF controller PCB reads the signals from the sensors and the copier andgenerates signals to drive the motor at such times as programmed in advance.The copying modes selected on the copier are communicated to the ADF in serial, and the ADFcommunicates to the copier the state of feeding originals to the copier in serial. (It does not use anIC for communications.)Figure 8-102Serial communicationCopierCompositepowersupplyPCB24V 5VROM(Q2)CPU(Q1)SwitchSensorADFcontroller PCBMotor[Output block][Control block][Input block]
