Scanner Motor (M3) Control Circuit - Canon NP6260 Service Manual

8. 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 for-
ward 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
J112
-B5
M3BRK*
J112
-B7
M3F/R*
J112
-B6
M3ON*
J112
-B4
M3CL
-B8
M3MD2
-B9
M3MD1
-B10
M3MD0
J112
-B11
M3FS
J112
-B12
M3FG
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 NP6560/NP6360/NP6260 REV. 0 NOV. 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