Fuser temperature control
The fuser temperature control maintains the temperature of the fuser heater at its targeted temperature.
The DC controller detects the fuser temperature by monitoring the FUSER TEMPERATURE (FSRTH1 and
FSRTH2) signals. The DC controller outputs the FUSER HEATER CONTROL (FSRD1 and FSRD2) signals,
so that the fuser heater control circuit controls the fuser heater accordingly.
Figure 1-5 Fuser circuit
FSRTH1
FSRD1
FSRTH2
/FSRARI
/AC200
DC controller
/RLD
/ZEROX
CURRMS
FSRSAFE
JP1001
RL101
Fuser control
H1, H2
TH1
TP1
Pressure roller
TH2
FSRD2
100V: Open
200V: Close
Zerocross
circuit
Relay control
circuit
Current
detection
circuit
Fuser heater
control circuit
Fuser heater
safety circuit
RL102
AC input
Fuser sleeve ass’y
Fuser
Low-voltage power supply (LPU)
Engine power supply (EPU)
●
Fuser heater protection: The fuser heater protection is a feature to detect excessive
temperatures of the fuser and interrupt power supply to the fuser heater.
ENWW
Engine-control system
13
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