>NEED HELP WITH A POWER SUPPLY PROBLEM. RF UNIT, POWER TRANSFORMER, AND
>LOW VOLTAGE CIRCUIT ARE OKAY. A SHORT BLOWS THE MAIN BREAKER(ON/OFF SW.)
>IMMEDIATELY WHEN TURNING ON UNIT. REPLACED BREAKER, NEW ONE BLOWS, AND
>ALSO BLEW A 25 OHM 20 WATT WIREWOUND RESISTOR(APPEARS IN THE B- CIRCUIT).
>NOT SURE HOW TO TEST RECTIFIER DIODES, OIL FILLED FILTER CAPACITORS, ETC.
>NO SHORTS VISIBLE. ANY HELP WOULD BE VERY MUCH APPRECIATED. THANKS,
>RICH WO2Y
* Diodes and capacitors typically short when they fail. The open 25-ohm
resistor suggests a +hv arc to gnd. Where is the resistor located -- in
the pos. or neg. hv? I would disconnect the ps from the rf deck and get
the ps working first.
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
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