Re: [TenTec] Ten-tec 962 ps problem problem

[Phil Zminda <phil-z@comcast.net>]

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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