Controlling The Cassette Heater - Canon GP605 Service Manual

CHAPTER 7 PICK-UP/FEEDING SYSTEM
VI . CONTROLLING THE CASSETTE HEATER
The drive of the cassette heater is synchronized with either the outlet power supply or the
control panel power switch, selected by the heater switch (SW3).
While the copier is operating (i.e., both power switch and control panel power switch are on),
the cassette heater ON signal (CASSETTE_HEATER_ON) controls the drive of the cassette heater
at all times.
Main power switch OFF
Sync with Drives the cassette heater.
outlet power
supply (ON)
Sync with Stops the cassette heater.
control panel
paper supply
switch (OFF)
From power
outlet
Main power
switch
Relay
(RLY2)
Control panel
24V
power switch
Relay PCB
MFC DC controller
PCB PCB
When the cassette heater ON signal
goes '1', the cassette heater turns on.
When making double-side copies in a
low-humidity environment, '0';
otherwise, '1'.
Figure 7-601 Block Diagram of the Cassette Heater Control Mechanisms
7-36
COPYRIGHT © 1999 CANON INC.
Table 7-601
Heater switch (SW3)
OFF ON
Heater switch
(SW3)
J1722
1 3
J2604
GND
4 3
J1722
24V
2 1
J505 J2605
A8
1
Main power switch ON
Control panel power
switch OFF
Drives the cassette heater.
Stops the cassette heater.
Selects either power outlet sync or control
panel power switch sync.
J2601
3
Z2602
RLY2602
Q2603
CASETTE _ HEAT _ ON
Heater drier PCB
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Main power switch ON
Control panel power
switch ON
Drives the cassette heater
in response to the cassette
heater ON signal.
J2601
4
J2602
4
J2602
3
Cassette heater
(H4)
Q2604