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POWER SUPPLY UNIT
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9. POWER SUPPLY UNIT
9.1 General description
The power supply unit consists of AC filters, insulation-type DC output circuits and heater lamp control
circuits in order to supply stable DC and AC voltage to each electric part of this equipment.
9.2 Construction
The power supply unit consists of the AC filter, insulation type DC output circuits and heater lamp
control circuit.
1. AC filter
Eliminates noise from the outside and prevents the noise generated by the equipment from leaking
to the outside.
2. DC output circuits
Converts AC voltage input from outside to DC voltage and supplies it to each electric part. The DC
voltage is divided into the following two lines.
a. Main switch line: Power supply used in the entire equipment during image forming process.
Two kinds of voltage (+5.1 V and +12 V) are output when the main switch
of the equipment is turned ON.
b. Cover switch line: Power supply used in the entire equipment during image forming process,
being supplied via the cover switch. Two kinds of voltage (+5.1 VD and
+24 VD) are output only when the main switch of the equipment is turned
ON and two covers (front cover and automatic duplexing unit) are closed.
3. Heater lamp control circuit
TRC (Triac) is driven by the heater control signal (BHCON, BHSON, PHON, SUBON) from the LGC
board and then AC power is supplied to each heater lamp (center heater lamp, side heater lamp,
pressure roller lamp) in the fuser unit.
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