2-6
2.4 Power Supply Unit (PSU)
The power supply unit receives the input line voltage and converts it to an output voltages of +5 VDC, +24
VDC, +12 VDC, and -12 VDC.
The heater circuit controls output voltage to the fuser heater according to instructions received from the
heater control circuit.
If an over-current is sensed in the secondary circuit, power is interrupted.
Power supply unit block diagram
The power supply unit has two output connectors.
The following table shows the connector outputs:
CN1
-- to the Fuser Heater
Pin No.
1
2
Output L N
CN2
-- to the Main Control PCB.
Pin
No. 1 2 3 4 5 6 7 8 9 10
11 12
13
Output
voltage
–12V +12V
+5V
HC1
+24V
GND
