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WARNING: Disconnect primary power prior to servicing.
Overall System Theory
Figure 4-8 3-Phase Power Supply
Simplified Soft-Start and Discharge Circuit
4.4.1.1.1 PA Power Supply Discharge
The PA Power Supply Discharge circuit also uses the Soft Start resistor to discharge
the 52Vdc PA supply. The discharge circuit is activated when the transmitter is
turned off. When the discharge circuit is active, it disables the SCRs to prevent the
supply from trying to turn on during a discharge cycle.
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