COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)C. Controlling the Pick-Up MotorFigure 5-215The pick-up motor is a 2-phase stepping motor, and is controlled by the pick-up motordriver (IC211) for pick-up operation.When the print sequence command is received from the D-CPU (IC202), the M-CPU(IC201) sends the pick-up motor drive signal (FEDPHA, FEDPHA*, FEDPHB, FEDPHB*)and the pick-up motor current level switch signal (FEDI0, FEDI1) to the pick-up motor dri-ver (IC211) by way of the expansion I/O (IC203).The pick-up motor driver (IC211) uses these signals to supply the motor with the drivesignals (FEDPHA, FEDPHA*, FEDPHB, FEDPHB*) to switch among three motor speeds:for normal clockwise rotation, normal counterclockwise rotation, and high-speed coun-terclockwise rotation.The motor torque varies in relation to rotation speed, requiring variation of the currentlevel, and the printer unit uses combinations of FEDI0 and FEDI1 signals to find theappropriate current level for each motor speed.CHAPTER 5 PICK-UP/FEEDING SYSTEM5-19J210-2-4-1-3DC controller PCB+24UHPick-up motorJ1202-2-4-1-369706671M5676892247624235151119J1201-20-17-19-18Pick-up PCBFEDPHAFEDPHBFEDPHA*FEDPHB*FEDI0FEDI1FEDPHAFEDPHBFEDPHA*FEDPHB*Pick-upmotordriver(IC211)D-CPU(IC201)M-CPU(IC202)ExpansionI/O(IC203)Download free service manual at http://printer1.blogspot.com
