Power Supply; Overview; Protective Function - Canon SADDLE FINISHER K3 Service Manual

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.
Fuse PCB
24V
Front cover switch
(MSW1)
Switch PCB
SW971-5
Module
isolation
drive circuit
Finisher controller PCB

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
2-136
COPYRIGHT© 2001 CANON INC.
24VSDL
SDLON
IC109
24V
(Q6)
Q104 24VR
F02-1207-01
2000 2000 2000 2000
Circuit
breaker
(CB1)
Regulator IC
Saddle stitcher controller PCB
CANON SADDLE FINISHER K3/K4 REV.0 MAR. 2001
24V
Motors
24V
Solenoids
5V
Sensors
5V
LED
5V
Logic circuits