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 1-4 Fuser components
Fuser heater safety
circuit
Low-voltage power supply
TH1
TP1
H1, H2
DC controller
Fuser heater control
circuit
TH2
FUSER TEMPERATURE signal
FUSER HEATER CONTROL signal
Pressure roller
Fuser sleeve
Table 1-3 Fuser components
Component name Function
H1 Fuser main heater Heats the fuser sleeve
H2 Fuser sub heater Heats the fuser sleeve
TH1 Main thermistor Detects the temperature at the center of the fuser heater
(Contact type)
TH2 Sub thermistor Detects the temperature on one end of the fuser heater
(Contact type)
TP1 Thermoswitch Prevents an abnormal temperature rising of the fuser heater
(Contact type)
12 Chapter 1 Theory of operation ENWW
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