Jerry,
Thanks for your help. The problem was the bridge; it was shorted. I
got the replacement from Mouser and now it's working. As for holiday
breakdowns, I found out that my Astron RS-20 supply also had a problem
under load when I tried to use it to replace the 962. Even though I
knew it couldn't deliver the full 22 amps, I thought I could get by at
75 watts or so. I finally took it apart and found an un-soldered or
barely soldered connection at the base of one of the pass transistors.
I got both fixed this past weekend.
Thanks and 73,
Phil N3ZP
> On Sun, 2009-09-06 at 20:54 -0400, Phillip Zminda wrote:
>> Over the weekend my 962 supply for my Omni VI blew the ac fuse every
>> time I turned it on. I expected that the bridge rectifier could be
>> the
>> problem. When I opened it up, I found that the bolt holding down the
>> filter board was loose leaving the bridge without a heat sink. I
>> haven't unsoldered the bridge but expect that it's the likely
>> problem. Has anyone else experienced blown fuse problems with the
>> 962?
>> Also, is this a part I can but from Ten-Tec without buying an entire
>> board?
>
> Its probably a standard part. Square, metal case with spade lugs for
> the
> four connections? Tentec probably has the part. Mouser probably has
> the
> part.
>
> Diodes tend to fail shorted when overheated. So its a good chance
> that's
> what is taking the fuse, though it could be a failure of a pass
> transistor insulated mounting or a bad electrolytic filter
> capacitor. Or
> the crow bar shorted or getting too sensitive and firing all the time
> there's power.
>
>> If not, does anyone know the specs for a direct replacement?
>> Since it's a holiday weekend, there's no chance to call Ten-Tec until
>> Tuesday.
>
> Probably 35 amps, 100 volts or greater PIV. About 1-1/8" square and a
> half inch tall. Look at the catalog number 583-MP351 at www.mouser.com
> or 625-GBPC3501-E4
>>
>> For me, if anything every breaks around the house, it's on a holiday.
>> I've had furnaces go out, dishwashers, stoves and any other number of
>> appliances go out on Christmas, July 4 or Memorial Day. This must be
>> my 2009 holiday breakdown.
>
> You hope this is your only holiday breakdown!
>>
>> Thanks for any input.
>>
>> Phil N3ZP
>> _______________________________________________
> 73, Jerry, K0CQ
>
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