Question about System Power Supplies
WHen first applying AC, the two DC voltages (+30 and +13.8 VDC) try coming up but suddenly fall back to zero. Recycling power switch a few seconds later gives same results.
The power supply is running, but there is a failure in the protection circuitry. Usually a shorted Zener diode or small signal transistor. The Op-Amp for the current limiter can cause the same symptom.
If the supply does this ONLY with the radio connected, there is usually one or more shorted PA transistors.
Posted on Jul 21, 2011
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