CHAPTER 6 FIXING SYSTEM
COPYRIGHT © 1999 CANON INC. CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
6-3
B.
Controlling the Fixing Temperature
1.
Outline
The fixing lower roller of the fixing assembly is driven by the main motor (M1). When the
fixing lower roller rotates, the film of the fixing upper unit starts to rotate in conjunction.
The fixing film is heated by the fixing heater (H1), which is a flat heater mounted in contact
with the inner side of the film. The fixing heater is equipped with a thermistor (TH1), which sends
the fixing thermister signal (TH1) to the microprocessor (Q101) on the DC controller PCB; in
response, the microprocessor controls the fixing heater duty signal (HEAT_PWM) to vary the
power supplied to the heater by way of controlling the temperature of the fixing heater.
Figure 6-103
DC controller PCB
HEAT_TRG
HEAT_OFF
Micro-
processor
+5V
Auxiliary
power supply
+5V
Relay
RL601
Thermal
fuse 2
Fixing heater high
temperature
error detection circuit
TH1
HEAT_ERR*
(Q101)
Timer
circuit
RLOFF*
Fixing heater
drive signal
Fixing heater
error signal
Fixing heater
OFF signal
HEAT_PWM
Fixing heater
duty signal
FU2
Relay
drive signal
Fixing
thermistor
Fixing heater
H1
Composite power
supply PCB
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