d. Moving the Scanner in ReverseWhen the scanner motor drive signal (M3ON) goes ‘1’ and the scanner forward sig-nal (M3F/R) goes ‘1’, the drive circuit turns on to rotate the scanner motor in counter-clockwise direction, thereby moving the scanner in reverse.e. Controlling the Speed of Rotation of the Scanner MotorThe DC microprocessor on the DC controller PCB sends the scanner speed signal(M3FS) to the scanner motor driver PCB according to the selected reproduction ratio.The revolution speed control circuit compares the scanner speed signal and the clockpulses (SCMCLK) from the scanner motor, and sends control signals to suit the dif-ference to the motor drive circuit.The motor drive circuit turns on and off the power (while keeping the voltage thesame) at short intervals to control the speed of rotation.Since the speed of rotation of the scanner motor is varied according to the selectedreproduction ratio, the reproduction ratio select signal (M3MD0, 1, 2) from the DC con-troller PCB is varied as shown in Table 3-304.Table 3-304CHAPTER 3 EXPOSURE SYSTEM3-18 COPYRIGHT © 1997 CANON INC. CANON NP6560/NP6360/NP6260 REV. 0 NOV. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)M3MD200001111M3MD100110011M3MD001010101One-sided copying204~172171~144143~120119~10099~7978~6261~49Scanner reverse
