Power Save Mode - Canon CP660 Service Manual

CHAPTER 7 EXTERNALS/AUXILIARY MECHANISMS
D.

Power Save Mode

When a power save command arrives from the printer board, the D-CPU (IC201)
uses the GA (IC204) to cause the power save command signal (PSVE*) to go '0', and
sends the result to the main relay PCB, turning off the FET switch on the main relay PCB
to stop +24 UH.
When the PSAVE* signal goes '0', on the other hand, the switching circuit on the DC
controller PCB turns on to cause the +5 V power save signal (P5SAVE) to go '0', there-
by cutting power to the sensors operating under the control of the PSAVE signal.
A command ending the power save mode from the printer mode causes the power
supply mechanism to resume normal mode.
DC controller PCB
(IC201)
(IC204)
Switching
High-voltage
Pick-up
PCB2/
PCB
separation
static elimination
high-voltage
PCB
Solenoid/
clutch/pick-
up motor
Laser driver/
Sensor
sensor BD
7-8
COPYRIGHT © 1999 CANON INC.
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D-CPU
PSAVE*
GA
PSAVE*
circuit
High-
voltage
Loads
PCB 1
Cartridge
motor
Printer
board
PCB
Figure 7-303
+24VB
Main relay PCB
Cover
switches
FET
switch
P5SAVE
Developing
rotary motor
PCB
Heat discharge
Developing
fan 1/
rotary motor/
heat discharge
solenoid
fan 2
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Sub relay PCB
+24VB
Cover
switches
Sensor
Sensor
Pre-exposure
LED relay
PCB
Heat discharge
fan 3/
Pre-exposure
LED assembly