[Test-Equipment] Exploding capacitors ? (wavetek 114s)

Tue, 24 Jun 2003 16:58:54 -0400

John,

Well, one side was read and the other black.
Not sure if it was technicaly epoxy, it is the
stuff like what is used to pot HV tripplers in tv's,
hard like cement.
I have cleaned it with isopropl alcohol(dry gas).

Jim Martz,

> Cmos wrote:
> 
> > John,
> >
> > I don't know how long it has been sitting, as I got it as-is a few weeks ago. But,
> > this dose seem to be the most likely cause, as other things(voltage, load, ect.)
> > seem to be ok. It was an axial cap. made up of a plastic tube with the ends sealed
> > with a very hard epoxy type stuff.
> 
> Was the epoxy red by any chance? They are notorious.
> 
> > Also, there was fluid that blow all over the boards when it exploded, so it was not
> > dry.
> 
> You should wash the remains off everything, quickly. The solution is corrosive. Wash,
> rinse, and let thoroughly dry (maybe with a small fan)
> 
> > It was also quite hot, as well as another one for the other polarity(was a +/-
> > 12volt supply).
> > So, steam pressure sounds like the cause.
> 
> Yep
> 
> > I think I am going to replace both these caps and two other ones about the same size
> > in another part of the power supply.
> 
> Good move. In future, reform before applying power or replace, the latter if this is
> not an antique where authenticity matters.-John
> 
> > Jim Martz,
> 
> 
> 
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-------------------------------------------
Jim Martz,
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