6 Sep
2011
6 Sep
'11
10:46 a.m.
I was clued up to what might happen when it was turned
on - after about
5 mins the magic smoke escaped from the 0.22uf metal film power supply
smoothing capacitor.
0.22uF is not a smoothing capacitor (at least not for any sensible PSU
frequency :-)). Most likely it's part of a the mains filter circuit. If
so, you can run without it for the moment, but it's best to replace it,
My guess is thati's across the live nad neutral of the mains (given its
value), so a class X capacitor would be fine.
Often when coe capacitor in amains filter fails, the others aren't far
behind. Although I dislike 'shotgun debugging', I normally replace the
lot. Anything betwene live and neutral can be replaced by a class X, but
the ones from one side of the mains to earth (ground) should be repalced
with class Y for safety. These are normally much lower in value, arroudn
4700pF.
-tony