HP Enterprise CP5525 manual Fuser-control circuit, TH4 Fuser Heater

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 main heater (H1): Heats the center of the fuser sleeve

●Fuser sub heater (H2): Heats the ends of the fuser sleeve

●Thermistors; detect the fuser temperature (contact type)

◦Sleeve thermistor (TH1): Detects the temperature at the center of the fuser sleeve

◦Main thermistor (TH2): Detects the temperature at the center of the fuser heater

◦Sub thermistor 1 (TH3): Detects the temperature at the end of the fuser heater nearest the front of the product

◦Sub thermistor 2 (TH4): Detects the temperature at the end of the fuser heater nearest the rear of the product

●Thermal fuse (FU1): Prevents abnormal temperature rise in the fuser heater (non-contact type)

Figure 1-6Fuser-control circuit

TH3	Pressure roller
Front of engine
TH1FU1
TH2
H1		Low-voltage power supply
H2		Fuser heater
TH4
	FUSER HEATER	control circuit
	CONTROL signal
		DC controller

FUSER TEMPERATURE signal

Fuser heater safety circuit

Fuser sleeve

ENWW Engine-control system 15