I am rather new at AV repair, but have a good understanding of general electronic repair.
Someone asked if I could take a look at their broken receiver. They were using it to drive 8 speakers throughout their office, with 4 speakers connected to each of the two "A" speaker terminals.
The amp is rated for 8ohm minimum speakers, and they had four 8ohm speakers wired in parallel, giving it a 2ohm load on each channel. Although it worked like this for quite some time, I am thinking it stressed something out in the amp and it finally blew.
This thing will not produce sound out of the "front" speaker terminals of the "B" speakers. It will also not produce sound from the "A" speakers at all.
The center channel and surround channels on speakers "B" still work.
It's not a setting problem. I have been though all of the settings and also reset the whole thing, with no results.
I took it all the way apart to look for anything obvious. Did not see anything. Tested the FETs on the heat sink and they are not shorted.
There are two large multi-pin Sanyo chips on the heatsink. Looking at the data sheet of them, one of them is used to drive 2 channels, and the other is used to drive 3 channels. I am guessing that the chip that drives 2 channels (STK433-130) is supposed to be driving the "front" speakers and is probably bad.
Thoughts?
Someone asked if I could take a look at their broken receiver. They were using it to drive 8 speakers throughout their office, with 4 speakers connected to each of the two "A" speaker terminals.
The amp is rated for 8ohm minimum speakers, and they had four 8ohm speakers wired in parallel, giving it a 2ohm load on each channel. Although it worked like this for quite some time, I am thinking it stressed something out in the amp and it finally blew.
This thing will not produce sound out of the "front" speaker terminals of the "B" speakers. It will also not produce sound from the "A" speakers at all.
The center channel and surround channels on speakers "B" still work.
It's not a setting problem. I have been though all of the settings and also reset the whole thing, with no results.
I took it all the way apart to look for anything obvious. Did not see anything. Tested the FETs on the heat sink and they are not shorted.
There are two large multi-pin Sanyo chips on the heatsink. Looking at the data sheet of them, one of them is used to drive 2 channels, and the other is used to drive 3 channels. I am guessing that the chip that drives 2 channels (STK433-130) is supposed to be driving the "front" speakers and is probably bad.
Thoughts?
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