COPYRIGHT© 2001 CANON INC.
2000 2000 2000 2000
CANON SADDLE FINISHER K3/K4 REV.0 MAR. 2001
2-136
CHAPTER 2 OPERATION OVERVIEW
12.7 Power supply
12.7.1 Overview
When the power supply to the copier is turned ON, 24VSDL is supplied from the fuse
PCB of the finisher and 24VR is supplied from the finisher controller PCB to the saddle
stitcher controller PCB. 24VSDL is used to drive the motors and solenoids. 24VR is regen-
erated as 5V by the saddle stitcher controller PCB regulator IC (Q6) and used for the sen-
sors, logic circuits and LEDs.
The 24VSDL and 24VR supplied to the saddle stitcher controller PCB are turned ON/
OFF by SW971-6 on the switch PCB. Supply of 24VSDL is interrupted if the front cover of
the finisher is open.
F02-1207-01
12.7.2 Protective function
The 24VSDL driving the motors and solenoids incorporates a circuit breaker (CB1) as
protection against over-current. The 24V driving the feed motor (M41), jogging motor
(M43), paper positioning plate motor (M44) and saddle tray motor (M49) incorporates a
fuse which shorts in the event of over-current.0
Switch PCB
SW971-5
Module
isolation
drive circuit
24V
24VR
24VSDL
24V
24V
5V
5V
5V
Fuse PCB
Front cover switch
(MSW1)
24V
Q104
IC109
SDLON
Finisher controller PCB
Motors
LED
Sensors
Solenoids
Regulator IC
(Q6)
Circuit
breaker
(CB1)
Saddle stitcher controller PCB
Logic circuits