Engine power supply
The power supply consists of the fuser-control circuit, the high-voltage circuit, and the low-voltage
circuit. The fuser-control and high-voltage circuits control the temperature of the fuser and generate high-
voltage according to signals from the DC controller PCA. The low-voltage circuit generates the DC
voltages that other components in the product use (for example the DC controller PCA, the motors, and
fans).
Fuser-control circuit
The fuser-control circuit controls the fuser components. The two fuser heaters provide the high
temperatures that cause the toner to permanently bond to the media. The fuser thermistor monitors the
fuser temperatures. The thermal switch detects abnormally high fuser temperatures and interrupts the
supply of voltage to the fuser if the temperature is too high.
Figure 1-10 Fuser control
DC controller
Fuser heater
drive circuit
Fuser heater
safety circuit
Relay
CPU
Fuser control
FUSER HEATER TEMPERATURE signal
FUSER HEATER
DRIVE signal
TH1
TP1
H1
TH2
Pressure roller
Fuser sleeve
ENWW
Engine-control system
15
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