Fuser-control circuit
The fuser-control circuit monitors and controls the temperature in the fuser. The product uses on-demand
fusing. The fuser-control circuit consists of the following major components:
●
Fuser heater (H1): heats the fusing film
●
Thermistor (TH1 and TH2): detects the fuser temperature (contact type)
◦
Main thermistor (TH1): controls the temperature in the fuser (contact type)
◦
Sub thermistor (TH2): detects a one-sided temperature rise in the fuser and controls the
temperature in the fuser (contact type)
●
Thermoswitch (TP1): prevents abnormal temperature rise in the fuser (contact type)
Figure 1-11 Fuser control circuit
TH2
TH1
TP1
H1
FUSER TEMPERATURE signal
FUSER HEATER CONTROL signal
Fuser heater safety
circuit
DC controller
Fuser control circuit
Pressure roller
Fuser film
Fuser heater control
circuit
Engine controller unit
ENWW
Engine-control system
17
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