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 1-11Fuser control circuit

H1

Fuser film

 

TP1

TH1

Pressure roller

TH2

FUSER TEMPERATURE signal

FUSER HEATER CONTROL signal

 

Fuser heater control

 

Fuser heater safety

DC controller

circuit

 

circuit

 

 

 

 

Fuser control circuit

Engine controller unit

16 Chapter 1 Theory of operation

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