Fuser temperature control

The fuser temperature control maintains the fuser heater at its targeted temperature.

The fuser main heater and sub heater control the temperature of the fuser sleeve.

The DC controller monitors the main thermistor and the sleeve thermistor. The DC controller controls the FUSER MAIN HEATER CONTROL (FSRD1) and the FUSER SUB-HEATER CONTROL (FSRD2) signals according to the detected temperature. The fuser-heater control circuit controls the fuser heater depending on the signal so that the heater remains at the targeted temperature.

Figure 1-7Fuser-heater control circuit

AC input

Low-voltage power supply

Noise filter

RL102

 

 

 

 

 

Fuser heater

 

FU102

 

 

 

 

control circuit

RL103

 

RLD1

 

 

RLD2

 

 

 

 

 

 

FSRD1

 

 

 

FSRD2

 

Zerocross

 

ZEROX

 

circuit

 

 

 

Fuser

 

 

 

Fuser presence circuit

 

FUSEROPEN

 

 

 

Improper fuser installation prevention circuit

FUHL

 

 

Fuser sleeve

 

 

H2

 

 

 

 

H1

 

 

TH3

TH2

TH4

THERM4

THERM2

 

TH1

 

 

 

THERM1

 

FU1

 

 

 

 

 

 

 

THERM3

DC controller

Fuser heater safety circuit

16 Chapter 1 Theory of operation

ENWW

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Image 40
HP Enterprise CP5525 manual Fuser temperature control, 7Fuser-heater control circuit