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Low volume on left channel of Sony STR-GX4ES

I have a vintage (circa 1989) Sony receiver (model STR-GX4ES) connected to a CD player and a speaker set. It had been in storage for a while, but was working beautifully when I first set it up.

Then, the sound in the left channel dropped dramatically and has static. I have isolated the problem to the receiver. When I swap the speakers and the wiring, the problem still occurs on the left side. When I plug headphones directly into the CD player everything is fine, but when I plug directly into the receiver, I get no sound on the left side of my headphones.

I also tried wiring the left speaker to the B channel (leaving the right speaker on A). When I turn the volume way up, I do get sound but there is static and of course, it is way out of balance with the right speaker.

So...what is going on here and is this something I can fix myself? Thanks in advance for your help!

Posted by on

  • LvsMusic May 08, 2008

    Hi Dan,



    Thank you for your blisteringly fast response!



    Although I haven't worked on electronics previously, I am certainly willing to learn how to solder. Given the age of this receiver, should I try fixing it myself (recognizing that I might do more harm than good) or take it in for service (not easy or cheap since I live far from civilization!)?



    I would love to repair this component since the sound is great, but I know it also might be time to move on to 21st century technology! What would you advise?



    Thanks again!

    Les

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  • 4,234 Answers

The headphone is tapped before the final stage of the amp, so knowing that those work properly helps to isolate the problem. I think that this model uses an IC for the voltage amp section prior to the final amp stage. That being said, the IC is probably an UPC2598 (if memory serves). I'll confirm tonight. Try resoldering any connections that appear to be grainy or have rings. Let me know what you find.
Dan

Posted on May 08, 2008

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