Power-save mode
The power-save mode reduces product power consumption. When the power supply unit receives the
power save (PSREM24V) signal from the DC controller, it stops the power supply from the +24V
generation circuit.
Fuser control
The power supply unit controls the temperature in the fuser unit. The product uses an on-demand fusing
method.
Figure 5-6 Fuser unit
TH801
FU1
H120/H220
TH802
TH803
FUSER HEATER
CONTROL signal
Fuser control
circuit
FUSER TEMPERATURE signal
Pressure roller
Fuser sleeve
DC controllerPower supply unit
Fuser heater
safety circuit
The fuser is composed of the following components.
●
Heater (100V model: H120/200V model: H220): Heats the fuser sleeve
●
Thermistors
◦
Main thermistor (TH801): Detects the center temperature of the fuser heater (contact type)
◦
Sub thermistor 1 (TH802): Detects the right side temperature of the fuser heater (contact type)
◦
Sub thermistor 2 (TH803): Detects the left side temperature of the fuser heater (contact type)
●
Thermal fuse (FU1): Prevents an abnormal temperature rise of the fuser heater
These fuser temperature controls are performed by the fuser control circuit and the fuser heater safety
circuit, which receive commands from the DC controller.
88 Chapter 5 Theory of operation ENWW
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