Remote Switch - Canon CP660 Service Manual

CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS
B.

Remote Switch

When the machine's printer unit power switch is turned off, the low-voltage power sup-
ply circuit sends the power-off signal (POFF) to the DC controller PCB. Thereafter, when
the printer unit is ready for power-off, the DC controller PCB causes the power-off con-
trol signal (PCONT) to go '1', thereby turning off the switching transistor of the power sup-
ply circuit to stop +5 V and +24 VB power.
This condition will turn off +5 R, PSAVE* and P5SAVE of the +5 V system and +24
VAR and +24 UH of the +24 VB system.
CB101
Noise filter
AC
Circuit
Power
breaker
supply
Rectification
Anti-rush
current circuit
Switching
transistor
Rectification
Control IC
smoothing
circuit
Power
supply
switch
Photo
coupler
High-voltage
PCB2/
Pick-up
separation
PCB
static eliminator
high-voltage
PCB
7-6
COPYRIGHT © 1999 CANON INC.
Download free service manual at http://printer1.blogspot.com
Low-voltage power supply
F
Fuse
circuit
24 V overvoltage
detection circuit
Transformer
24 V overcurrent
detection circuit
Photo
coupler
DC controller
Printer
Laser
board
driver/sensor/
BD PCB
Figure 7-302
Rectification
circuit
DC-DC
Regulator IC
converter
5 V
+5VS
overcurrent/
overvoltage
+5V
/PSAVE
Main relay PCB
+24UH
Developing
Sub relay
rotary PCB
PCB
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
High- Pre-
voltage exposure
PCB 1 LED relay
PCB