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The good news is that it's in one channel, which means you have the right channel parts to compare it with. Now the bad news whatever causing it and it's likely to be a semi-conductor (transistor or IC) has to be replaced. However finding it is easier than you might think. For a start it's going to be hot to touch. And you can get get it to stop being hot, while the amps on, so correcting the fault, for a while. You do this by spraying it with Servisol Super Freezer spray. You have to have the amp running for this. Find the left channel amp and wait while it goes bad. Then spray (one at a time) any part you suspect. If the sound returns to normal, you have found the faulty part! To prove it spray the same in the right channel. That shouldn't change.
You can get the freezer spray from your local electric parts shop (such as Maplin UK).
It depends on how you intend to use it, your technical skills, and how much money you're willing to put into it. If your intent is to use it with a LCD / Plasma home theater system, you would be better off purchasing a new receiver.
If you want to keep it for some other purpose, and have the technical skills and tools necessary to repair it yourself, I would recommend purchasing a service manual for your receiver.
The other alternative is to find an electronics repair shop and get an estimate on what it would cost to fixt it.
In some cases, problems such as fuzz in the volume and balance controls, can be fixed using a high quality non corrosive electronic contact cleaner. This type of "possible" repair works best with potentiometers. However, there's no guarantee contact cleaner will correct the problem. It may be necessary to replace the components.
If component replacement is necessary, the service manual will be an invaluable asset when it comes to finding a compatible replacement part.
I can understand why you might want to get it repaired as I'm a fan of Sansui, Nakamichi, and other like equipment. I currently have a Nakamichi receiver that has the same problem with the volume and balance controls. At some point, I'll take the time to repair it.
For now though, I purchased a new receiver to connect to my home theater system and I'm actually glad I did as the new receiver is more compatible with the hardware available on the market today.
I believe you have dry joints in output drive it require a qualifier Technician the do this you need special soldering station with anti static you are dealing with surface mount components if you shorted some thing in output drive it could damage to the output they are expensive to replace, now is not too bad you should bring in to Sony or servicce center Sony to repair it
hi. i have a sony amplifier. i plug the speakers in like normal. i turn it on and the right side speeker works fine. but you half to crank it up all the way just to barely hear the left speeker. we switched speakers and its still the same effect. we think its the amp itself. we tried our balance settings. it was fine. but right now its just playing one speaker louder then the left one. can anyone help me?
The rear signal is generated and separated internally, if either the processing is not correct or the rear channel amplifier has a problem, you can get this type of behavior. Does the static happen more often at higher volumes or is it purely random? Does changing the volume make the static louder or is it always the same level?
Open the receiver and locate the potentiometer for the volume. There should be small openings in which you can spray electrical contact cleaner. The spray can be found at any electronic supply store (Radio Shack). Make sure the product says no or zero residue. I use a product called "Electrosolve". After spraying, immediately rotate the pot back and forth a few times. You may need to repeat this process two or three times. You might as well hit the other controls while you're at it. If several attempts don't eliminate the problem, the pot will need to be replaced.
I think it's a grounding problem. Actually, it's a necessity for all audio-video equipments to get grounded properly. If you don't have a ground connection in your AC plug, your receiver will collect more and more static electricity. As a matter of fact, it decreases the sound quality that you can get from your equipment. I think that the effect of your reaction (slapping the receiver) isn't coincidental. When you touch any metal surface on your receiver (even while slapping) you condact the static electricity to the ground.
I've had a same sort of problem with my receiver. Especially when I connected my laptop computer to the receiver, I heard an annoying distorted sound from the speakers. I found out that it was ground loop, which occurs when the negative (common) signal of the source coincides with the one of the receiver's. As a solution, I grounded my amp, changed all wires with new and shielded ones, and purchased an AC filter. Then, I got rid of the noise. I have to say that the AC filter (Belkin Pure AV Surge Protector, it also includes an AC signal filter)benefited me the most.