Canon PC720 Service Manual - Page 85

Fixing, Delivery

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OPERATIONS AND TIMING D. Fixing and Delivery 1. Outline The drive roller of the fixing assembly is driven by the main motor (M1). The rotation of the drive roller turns the fixing film, ultimately rotating the lower fixing roller. The temperature of the fixing heater is monitored by the thermistor (TH1), and is communicated to the microprocessor on the DC controller PCB as the fixing heater temperature signal (TH1). Drive roller Based on the value of the TH1 signal, the microprocessor on the DC controller PCB changes the fixing heater drive signal (HTRD) to control the temperature of the fixing heater. The rear end of the fixing heater is equipped with a sub thermistor (TH2) to check for overheating. M1 Main motor Thermistor Tension roller Delivery roller Fixing film Fixing heater Lower fixing roller Figure 3-409 COPYRIGHT © 1994 CANON INC. CANON PC72017401750/170 REY.° AUG.1994 PRINTED IN JAPAN pmpRimt AU JAPON) 3-45

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OPERATIONS
AND
TIMING
D.
Fixing
and
Delivery
1.
Outline
The
drive
roller
of
the
fixing
assembly
is
driven
by
the
main
motor
(M1).
The
rotation
of
the
drive
roller
turns
the
fixing
film,
ultimately
rotating
the
lower
fixing
roller.
The
temperature
of
the
fixing
heater
is
monitored
by
the
thermistor
(TH1),
and
is
communicated
to
the
microprocessor
on
the
DC
controller
PCB
as
the
fixing
heater
tem-
perature
signal
(TH1).
Drive
roller
Delivery
roller
Based
on
the
value
of
the
TH1
signal,
the
microprocessor
on
the
DC
controller
PCB
changes
the
fixing
heater
drive
signal
(HTRD)
to
control
the
temperature
of
the
fix-
ing
heater.
The
rear
end
of
the
fixing
heater
is
equipped
with
a
sub
thermistor
(TH2)
to
check
for
overheating.
Thermistor
M1
Main
motor
Tension
roller
Fixing
film
Fixing
heater
Lower
fixing
roller
Figure
3-409
COPYRIGHT
©
1994
CANON
INC.
CANON
PC72017401750/170
REY.°
AUG.1994
PRINTED
IN
JAPAN
pmpRimt
AU
JAPON)
3-45