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AC POWER AND DC POWER DISTRIBUTION
31 March 1994
When this copier is plugged in and the main switch is turned off, ac power is
supplied via the ac drive board to the anti-condensation heater. When the
front cover and/or the exit cover is open, the cover safety switch completely
cuts off power to all ac and dc components. The RAM board has a back up
power supply (dc battery) for the service program mode and misfeed job
recovery.
When the main switch is turned on, the ac power supply to the
anti-condensation heater is cut off and ac power is supplied to the ac drive
board. The main and optional transformers receive wall outlet ac power
through the ac drive board. The main transformer outputs 28 volts ac to the
main dc power supply board. The optional transformer outputs 10 volts ac
and 26 volts ac to the optional dc power supply board.
The main dc power supply board converts the 28 volts ac to +5 volts and a
zero cross signal. The main dc power supply board also converts 28 volts ac
to +24 volts.
The +5 volt and +24 volt currents are supplied to the copier main board. The
zero cross signal is supplied to the copier main board. The main dc power
supply board has a scanner motor drive circuit. The scanner motor drive
circuit produces scanner motor drive signals.
The copier main board supplies dc power to all copier dc components except
the scanner motor. All sensors and switches operate on +5 volts. All other dc
components including the power relay (RA401) and the main motor relay
(RA402) operate on +24 volts. The copier main board also supplies the +5
volt and +24 volt currents to the sorter.
The main board supplies +24 volts to the lens motor. The main dc power
supply board supplies +24 volts to the scanner motor. The main board sends
the control signals to the lens motor and to the scanner motor drive circuit on
the main dc power supply board.
The optional dc power supply board supplies +5 volts and +24 volts to the
ARDF.
When the main board receives power, it activates the power relay (RA401)
which then supplies ac power to the fusing lamp drive circuit, and the
exposure lamp drive circuit on the ac drive board. The exhaust blower motor
begins rotating at low speed. The fusing lamp drive circuit receives a trigger
signal from the main board and the fusing lamp lights. The exposure lamp
does not turn on until the main board sends a trigger pulse to the exposure
lamp drive circuit.
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