Hi,
I have an old Technics SA-80 receiver that pulled out to use with a turntable I just got.
I hooked it up and while there's no noise problem (doesn't buzz without a source), the left channel sounds great but the right channel seems to be distorted or otherwise buzzy. The audio is coming through just poorly.
I checked different inputs, different speakers in both main and remote (A and B) and same problem.
I should mention that a while back I took it apart and damaged the balance pot. With some help from the forum here it was determined that I could just de-solder and ignore. I can't remember at the time if it was buzzing, if it was I probably attributed it to lousy speakers.
I tried checking for bad caps etc, but a bad cap would cause problems in both channels right?
Anyway I got the thing apart and need some troubleshooting ideas.
I have an old Technics SA-80 receiver that pulled out to use with a turntable I just got.
I hooked it up and while there's no noise problem (doesn't buzz without a source), the left channel sounds great but the right channel seems to be distorted or otherwise buzzy. The audio is coming through just poorly.
I checked different inputs, different speakers in both main and remote (A and B) and same problem.
I should mention that a while back I took it apart and damaged the balance pot. With some help from the forum here it was determined that I could just de-solder and ignore. I can't remember at the time if it was buzzing, if it was I probably attributed it to lousy speakers.
I tried checking for bad caps etc, but a bad cap would cause problems in both channels right?
Anyway I got the thing apart and need some troubleshooting ideas.
If you remove C601 and C602. Connect a capacitor of around 10uF 16Volts between the positive solder pad of C601 and the negative solder pad of C602. If the sound is still nasty the output chip is faulty. If it is OK there is a pre amp/tone control/driver issue.
A "Bad cap" may affect one channel only.
A "Bad cap" may affect one channel only.
I gave your idea a shot and still bad sound out of that channel.
Is it definitely the amp chip? Anything else I can try?
Is it definitely the amp chip? Anything else I can try?
I would operate every switch and control repeatedly to see if the sound intermits. If it's not that, it could be a bad capacitor, bad solder connection someplace, etc. But it does sound like the output I.C. now.
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