Canon FINISHER - D1 Service Manual page 79

4. Controlling Tray B Lifter Motor
Figure 2-603 is a block diagram showing how tray B lifter motor (M12) is driven. The tray B
lifter motor is a 4-phase stepping motor. The motor is turned on and off and the direction of its
rotation is changed by switching between pulse signals A, B, A*and B* and by changing the output
timing of four pulse signals. To hold the motor, the level of STTRYMHLD is switched to a hold
level.
The finisher controller monitors the state of tray B locked sensor (PI23) when pulse signals are
generated. The finisher controller PCB assumes that the motor rotation is normal if the sensor repeats
turning on and off at specific intervals while pulses are being generated. Otherwise, it will identify an
error in the motor or the drive mechanism, and will indicate an error code on the copier's control
panel.
J6
1
2
3
4
5
6
N.C. N.C.
7
8
9
10
11
12
13
Finisher controller
PCB
COPYRIGHT © 1999 CANON INC.
J61
+5V
13
*
STTRYMBB
12
STTRYMBB
11
*
STTRYMBA
10
STTRYMBA
9
STTRYMHLD
8
+36V
7
6
5
4
3
2
1
Tray B lifter motor
driver PCB
Figure 2-603
CANON FINISHER - D1 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
+36V
Tray B lifter
J62
motor
A
3
M12
1
A*
4
B
5
2
B*
6
CHAPTER 2 OPERATIONS
Tray B locked
sensor
PI23
Torque limiter
To lifter rack
2-53