I bought this off someone on craigslist today and supposedly all it need was 2 fuses for the speaker protection circuit. I bought the correct 3.3 amp 125v fuses and tried the receiver and there is still no sound. If I remove the right channel speaker protection fuse, The breaker switches and sound plays, but only through the left channel. If I put the fuse back in, the breaker trips and there is no sound again. The breaker stays tripped if I leave just the right channel fuse in as well. I noticed on the board that there is a burnt up resistor. Could this be part of the issue? Any help would be greatly appreciated. Thanks!
Well I havent found schematic for that model, but have found one for SA 5220 and I guess there are some if not many similarities. So in that model the output fuse is connected in that way that the speaker protection sense is connected between fuse and speaker terminals, so if you remove fuse you remove connection to the amp and protection doesnt sense anything so left amp works.
My guess is that you have probably some shorted output transistors on the right chanel and when you put fuse in, protection senses DC and trips to protect speakers.
Take your multimeter and measure for short circuit on right ch. output transistors. You can use left chanel as a reference because you know it is ok.
My guess is that you have probably some shorted output transistors on the right chanel and when you put fuse in, protection senses DC and trips to protect speakers.
Take your multimeter and measure for short circuit on right ch. output transistors. You can use left chanel as a reference because you know it is ok.
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