Specifications

The main dc power supply board converts the 10 volts ac input to +5 volts
and a zero cross signal. There are two 26 volts ac inputs. The dc power
supply board converts them to +24 volts and +30 volts.
The +5 volts and +24 volts are supplied to both the copier main board and
the sorter main board. The zero cross signal and +30 volts are supplied to
the copier main board.
The copier main board supplies dc powers to all copier dc components. All
sensors, and switches plus the interface board operate on +5 volts. The
scanner motor operates on +30 volts. All other dc components including the
power relay (RA401) and the main motor relay (RA402) operate on +24 volts.
The ARDF and the duplex unit have a separate dc power supply.
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 send a trigger pulse to the exposure
lamp drive circuit.
When the Start key is pressed, the main board energizes the main motor
relay (RA402). Then, the main motor and the quenching lamp turn on and the
exhaust blower starts rotating at high speed.
When the main switch is turned off, power is cut off to the main board and to
RA401, and the drum and optional anticondensation heaters are turned on.
The exposure lamp and the fusing lamp power lines are completely
disconnected from the line voltage.
1 December 1990
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