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Old 10th March 2009, 07:04 PM   #1
moss99 is offline moss99  United Kingdom
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Default are these capacitors installed correctly

Hi all i am trying to repair this old yamaha amp i have put these 2 black new capacitors in now i seem to have this fuse blowing on the board just above them (see photo) is there any way to tell if i have installed them with the polaritys wrong i was sure they went back the same though..
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Old 10th March 2009, 07:10 PM   #2
moss99 is offline moss99  United Kingdom
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This circled in red was getting very hot..
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Old 10th March 2009, 09:32 PM   #3
taj is offline taj
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The stripe on the capacitor is negative. That will usually be marked on the circuit board somewhere as well. Other than that, it's pretty hard to tell from a photo.

If the caps are in backwards, I'd expect them to release their smoke (rapidly).

That white thing looks like an auxiliary power bridge rectifier, which would probably normally get a little warm, but if it's dangerously hot, then there's probably some circuit problem.

..Todd
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Old 11th March 2009, 07:28 AM   #4
moss99 is offline moss99  United Kingdom
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Hi yes it did get very hot i de soldered 2 of the output transistors(C789) last night and 2 of 4 are dead ,, possibly shorted on the heatsink as the little plastic bush/washer things all broke up when i screwed them back in for the first time ,,
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Old 11th March 2009, 07:53 AM   #5
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Quote:
Originally posted by moss99
This circled in red
Look more like they should read MPC708 or MPC733, 0.22Ohm.
Dual metal plate emitter resistors by Fukushima Futaba (with three legs each).
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