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OUTLINE OF THE MACHINE
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3.18 Power Supply Unit
3.18.1 General Description
The power supply unit consists of the AC filter, insulation type DC output circuits and heater lamp
control circuit.
Notes:
In a model with 2 power cables, the total current capacity to be used should not exceed the
breaker rating.
3.18.2 Composition
[ 1 ] Description of Operations
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 power switch line:Power supply used in the entire equipment during image forming process.
Two kinds of voltage (+5.1 V and +12V) are output when the main power
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 (+5.1VD and
+24VD) are output only when the main power 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 control signal from the LGC board and then AC power is supplied to
each heater lamp in the pressure roller.
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