Punch Registration Motor (M17) / Punch Motor (M18) Drive Control - Canon SADDLE FINISHER K3 Service Manual

CHAPTER 2 OPERATION OVERVIEW

7.1.8 Punch Registration Motor (M17) / Punch Motor (M18) Drive Control

An outline of the punch registration motor (M17) and punch rotating motor (M18) drive
circuit is shown in the diagram below. M17 is a 4-phase stepping motor. Drive pulses are
sent from IC121 on the finisher controller PCB.
M18 is a DC motor. IC125 sends signals which control the motor's rotation direction and
speed.
The punch registration motor's PNHREGREF outputs signals to control the electrical cur-
rent level switching while the motors are running and also while they are in hold mode.
Each motor has three current levels for operating mode and one for hold mode.
Finisher
controller
PCB
IC125
2-82
COPYRIGHT© 2001 CANON INC.
Punch driver PCB
PCH_SFTN_CW
J741-A8
PCH_SFTN_CLK
J741-A9
PCH_SFTN_REF
J741-A10
PCH_M_CCW
J741-B14
PCH_M_CW
J741-A6
PCH_M_PWM
J741-A7
F02-701-14
2000 2000 2000 2000
24VH
J744
A
4
5
A*
2
Q758
B
3
6
B*
1
J746
Punch
2
rotation
1
motor
CANON SADDLE FINISHER K3/K4 REV.0 MAR. 2001
Punch
registration
motor
M17
Motor
driver PCB
M18