Quote:
Originally Posted by Ampkat
Ok I got big AC signal on pin 2 of T-605 with the isolation tranny hooked up and scoped and the only AC signal on the other side was small on 10 & 11 so does that whole other side get rectified for each pair of windings. 5&6 / 7,8(ct)9 and 10 &11 ?
So I should get DC at all of those rectifiers right and the ground reference would be the cold gnd or pins 3 & 4 of connector 641. This whole thing sounds like an open ground because the whole supply at CN-641 has no voltage at all.
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If you have AC on T605 pri you get your B+ UNLESS its to small,
way off freq, or there is a short. I may be wrong but I think they ran
around 30kc with 2oov pulses. I do remember the training manual said
the waveform had to be perfect. You say the IC runs hot, check
for shorts on the secondary especially D648 ( lift it).
Beyond that you may need some outside help & I can give you
some ideas on that.
BTW manual has no waveforms but the Sams manual prob. does.
73 Zeno