User Guide

Fuser control
The fuser heater control circuit and the fuser heater safety circuit control the fuser temperature according
to commands from the DC controller. The product uses an on-demand fusing method.
Figure 1-8 Fuser components
TH3
TH2
Fuser heater
control circuit
TH4
High-voltage power supply
TH1
TP1
H1/H2
Pressure roller
Fuser film
DC controller
FUSER TEMPERATURE signal
FUSER HEATER CONTROL signal
Fuser heater
safety circuit
The following table shows the function of each fuser component.
Component Function
H1 Fuser main heater Heats center area of the fuser film
H2 Fuser sub heater Heats both ends of the fuser film
TP1 Thermoswitch Prevents an abnormal temperature rise of the fuser heater (contact type)
TH1 Main thermistor Detects the temperature at center of the fuser heater (contact type)
ENWW
Engine control system
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