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2001 CANON INC. 2000 2000 2000 2000 CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001
CHAPTER 6 FIXING SYSTEM

6-6 P

3 Controlling the Fixing Temperature
3.1 Outline

The fixing temperature is controlled for the following:

[1] Fixing heater temperature

[2] Thermistor error detection

F06-301-01

+5V
+5V
+5V
TH1
TH2
IC334
IC300
Fixing main
thermistor
Fixing sub
thermistor
Heater relay circuit
A/D converter
(200V)
Thermal switch
(TP1)
Fixing main heater (H1)
Fixing sub heater
(H2)
Switch PCB
RelayRL1
DC controller PCB
Main power supply PCB
High-
temperature
detection
circuit