Fuser-control circuit
This product features on-demand fusing. The fuser heater control circuit controls the fuser
temperature according to commands from the DC controller. The fuser-control circuit consists of the
following major components:
Figure 1-6 Fuser-control circuit
Fuser heater
safety circuit
H1, H2, H3
TH1
TP101
TH2
TH3
Fuser sleeve
Pressure roller
FUSER TEMPERATURE signal
Fuser control
FUSER HEATER CONTROL signal
DC controller
Fuser heater
control circuit
TH4
Table 1-13 Fuser components
Abbreviation Component name Function
H1 Fuser main heater Heats the edge of the fuser sleeve
H2 Fuser sub heater Heats the edge of the fuser sleeve
H3 Fuser sub heater Heats the center area of the fuser sleeve
TH1 Main thermistor Detects the center temperature of the fuser heater
TH2 Sub thermistor 1 Detects the temperature at one end of the fuser heater
TH3 Sub thermistor 2
TH4 Sub thermistor 3
TP101 Thermoswitch Prevents an abnormal temperature rise of the fuser heater
ENWW Engine-control system 21
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