Scanner Motor (M3) Control Circuit - Canon NP6251 Service Manual

7. Scanner Motor (M3) Control Circuit

a. Outline
Figure 3-308 shows the circuit used to control the scanner motor, and the circuit has
the following functions.
Turning on and off the scanner motor.
Controlling the direction of rotation of the scanner motor.
Controlling the speed of rotation of the scanner motor.
b. Stopping the Rotation of the Motor
When the scanner motor drive control signal (M3ON) goes '0', the drive circuit turns
off so that the motor does not rotate.
c. Moving the Scanner Forward
When the scanner motor drive control signal (M3ON) goes '1' and the scanner
forward signal (M3F/R) goes '0', the drive circuit turns on so that the scanner motor
rotates clockwise, thereby moving the scanner forward.
DC controller
PCB
J112B
-5
M3PRL
J112B
-7
M3F/R
J112B
-6
M3ON
J112B
-4
MSNCON
-8
M3MD2
-9
M3MD1
-10
M3MD0
J112B
-11
M3FS
J112B
-12
CLK
COPYRIGHT © 1997 CANON INC.
Scanner motor driver PCB
J632
Motor stop
8
circuit
Motor
drive
circuit
J632
6
J632
7
J632
9
5
Motor rotation
speed
4
control circuit
3
J632
2
1
Figure 3-308
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 3 EXPOSURE SYSTEM
U
Hall
IC
V
Rotor
Scanner
W
motor (M3)
SCMCLK
Clock
pulse
generator
3-17