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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.

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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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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).
BOXES for crying out loud
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