COPYRIGHT© 2001 CANON INC.
2000 2000 2000 2000
CANON SADDLE FINISHER K3/K4 REV.0 MAR. 2001
2-68
CHAPTER 2 OPERATION OVERVIEW
6.1.6 Tray A/B lifting motor control
The diagram below illustrates how the tray A/B lifting motors (M12/M13) are driven.
The tray A/B lifting motors are 4-phase stepping motors. The finisher controller PCB con-
trols the output timing of the pulse signals A, B, A* and B*, to switch the motors ON/OFF
and to switch the direction of rotation. In motor hold, the STTRYMHLD level is switch to a
hold level.
The finisher control PCB monitors the status of the tray A/B idling sensors (PI19/ PI18)
when generating pulse signals. If the sensors switch ON/OFF at the prescribed timing dur-
ing pulse output, the motor rotation is judged normal. If the sensor output does not switch
ON/OFF properly, a motor malfunction or drive mechanism malfunction is judged, and an
error message is displayed on the copier control panel.
F02-601-07
IC121
Q601
+36V
36VTRYA/
36VTRY
A
A
*
B
B
*
M13/M12
+5V
STTRYMAB*/STTRYMBB*
STTRYMAB/STTRYMBB
STTRYMAA*/STTRYMBA*
STTRYMAA/STTRYMBA
STTRYMHLD
IC124
J602
J81/
J89
J113A/
J109A
13
12
11
10
9
8
7
6
5
4
3
2
1
1
2
3
4
5
6
7
8
9
10
11
12
13
3
1
4
5
2
6
To elevator
rack
PI19/ PI18
Tray A/B
idling
sensors
Torque limiter
Tray A/B lifting motor driver PCB
Finisher
controller
PCB
N.C. N.C.
Tray A/B
lifting
motors
