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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Yesterday I went to turn my receiver on and listen to an album when I
noticed I was getting a lot of distortion in my right channel speaker. I decided to test out what was going on. I moved the right speaker to the B output on the right channel and was experiencing the same static/distortion. I then switched the right speaker to the left A output and everything worked fine. To be certain, I switched the left speaker to the right channel to find the speaker was producing the same sound as the right speaker had earlier. So anyway, it's certainly a problem with the right channel and not the speakers. Both the A and B outputs are producing this very distorted static sound. I don't have much knowledge of audio electronics, but I have worked on electronics before and can solder, etc. But when it gets down to it, I can't imagine where to really begin. I imagine since the left channel is working properly (and I'm assuming both match electronically) I could easily see where the problem is, if I knew where to begin. I'm assuming nothing blown, but could something need to be re-soldered? The channel is still producing sound, but it sounds quite a bit like a blown speaker, with the static and rattling. |
#2
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![]() "Chris L." wrote in message oups.com... | Yesterday I went to turn my receiver on and listen to an album when I .... | is still producing sound, but it sounds quite a bit like a blown | speaker, with the static and rattling. You need a scope and an audio oscillator, or a LOT of experience. N |
#3
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Could be a driver IC, or maybe solder connections.
Mark Z. "Chris L." wrote in message oups.com... Yesterday I went to turn my receiver on and listen to an album when I noticed I was getting a lot of distortion in my right channel speaker. I decided to test out what was going on. I moved the right speaker to the B output on the right channel and was experiencing the same static/distortion. I then switched the right speaker to the left A output and everything worked fine. To be certain, I switched the left speaker to the right channel to find the speaker was producing the same sound as the right speaker had earlier. So anyway, it's certainly a problem with the right channel and not the speakers. Both the A and B outputs are producing this very distorted static sound. I don't have much knowledge of audio electronics, but I have worked on electronics before and can solder, etc. But when it gets down to it, I can't imagine where to really begin. I imagine since the left channel is working properly (and I'm assuming both match electronically) I could easily see where the problem is, if I knew where to begin. I'm assuming nothing blown, but could something need to be re-soldered? The channel is still producing sound, but it sounds quite a bit like a blown speaker, with the static and rattling. |
#4
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This is most likely some failed components in the audio output stage, and
the pre-driver stages. You will need a lot of experience in servicing this type of affair, a scope, a DVM, and an audio generator to properly troubleshoot this. You will most likely also need the service manual for your reciever. This type of servicing can also get somewhat complex in its nature. An intelligent decision would be to give the set out to service center that is able to service your reciever. -- -- Jerry G. ===== "Chris L." wrote in message oups.com... Yesterday I went to turn my receiver on and listen to an album when I noticed I was getting a lot of distortion in my right channel speaker. I decided to test out what was going on. I moved the right speaker to the B output on the right channel and was experiencing the same static/distortion. I then switched the right speaker to the left A output and everything worked fine. To be certain, I switched the left speaker to the right channel to find the speaker was producing the same sound as the right speaker had earlier. So anyway, it's certainly a problem with the right channel and not the speakers. Both the A and B outputs are producing this very distorted static sound. I don't have much knowledge of audio electronics, but I have worked on electronics before and can solder, etc. But when it gets down to it, I can't imagine where to really begin. I imagine since the left channel is working properly (and I'm assuming both match electronically) I could easily see where the problem is, if I knew where to begin. I'm assuming nothing blown, but could something need to be re-soldered? The channel is still producing sound, but it sounds quite a bit like a blown speaker, with the static and rattling. |
#5
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![]() Jerry G. wrote: This is most likely some failed components in the audio output stage, and the pre-driver stages. You will need a lot of experience in servicing this type of affair, a scope, a DVM, and an audio generator to properly troubleshoot this. You will most likely also need the service manual for your reciever. This type of servicing can also get somewhat complex in its nature. An intelligent decision would be to give the set out to service center that is able to service your reciever. -- -- Jerry G. ===== "Chris L." wrote in message oups.com... Yesterday I went to turn my receiver on and listen to an album when I noticed I was getting a lot of distortion in my right channel speaker. I decided to test out what was going on. I moved the right speaker to the B output on the right channel and was experiencing the same static/distortion. I then switched the right speaker to the left A output and everything worked fine. To be certain, I switched the left speaker to the right channel to find the speaker was producing the same sound as the right speaker had earlier. So anyway, it's certainly a problem with the right channel and not the speakers. Both the A and B outputs are producing this very distorted static sound. I don't have much knowledge of audio electronics, but I have worked on electronics before and can solder, etc. But when it gets down to it, I can't imagine where to really begin. I imagine since the left channel is working properly (and I'm assuming both match electronically) I could easily see where the problem is, if I knew where to begin. I'm assuming nothing blown, but could something need to be re-soldered? The channel is still producing sound, but it sounds quite a bit like a blown speaker, with the static and rattling. Good call. Thanks guys. |
#6
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"Chris L." wrote:
Yesterday I went to turn my receiver on and listen to an album when I noticed I was getting a lot of distortion in my right channel speaker. I decided to test out what was going on. I moved the right speaker to the B output on the right channel and was experiencing the same static/distortion. I then switched the right speaker to the left A output and everything worked fine. To be certain, I switched the left speaker to the right channel to find the speaker was producing the same sound as the right speaker had earlier. So anyway, it's certainly a problem with the right channel and not the speakers. Both the A and B outputs are producing this very distorted static sound. I don't have much knowledge of audio electronics, but I have worked on electronics before and can solder, etc. But when it gets down to it, I can't imagine where to really begin. I imagine since the left channel is working properly (and I'm assuming both match electronically) I could easily see where the problem is, if I knew where to begin. I'm assuming nothing blown, but could something need to be re-soldered? The channel is still producing sound, but it sounds quite a bit like a blown speaker, with the static and rattling. Don't even attempt repairs. One mistake, and you can make matters MUCH worse. You can look for loose solder, but more likely is a bad driver i.c. / voltage amplifier, or a blown transistor accompanied by a shorted transistor. The chances of it being just an open resistor is remote. With these type of repairs, you normally have to check all the transistors, resistors, and diodes in the circuit before even firing it up. Or would you like to serve up the classic "Smoke Test" 1/2 of your push pull output circuit in that channel has an open resistor due to a blown transistor, or the driver i.c. is involved. Get this one to a pro or suffer the consequences. Except for a quick, pre-fix voltage check, I don't even turn these on until after checking all of the normal suspects. Regards, -- Don McPherson, Don's Electronics - since 1969 Colorado Springs |
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