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Sharp SM-1122 Stereo Amplifier Left Channel Fading

T

tsqrl

New Member
I own two Sharp SM-1122 stereo amplifiers. They both have the same problem - left channel fades out randomly. Sometimes it slowly fades out and sometimes it mutes straight away. The amplifier has DIN outputs and I use AUX output via DIN->RCA->TRS-adapter to plug it to my computer. Adapters are definitely okay. I have to plug the RCA again to get left channel work again. It might have some issues with grounding since plugging in makes buzz noise. But that noise helps the channel to work again. Somehow it needs a shock to wake up. During a movie I might need to reconnect RCA ten times.

I put Kontakt 60 every place I could imagine to remove tarnish, but it did not help. Some connection or component is bad, but I have no idea which. Rolling knobs usually doesn't have effect. SM-1122 amplifier is all right except this problem so I wouldn't want to get a new amp too easily. Maybe if someone would give me one.
 
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Welcome! Have you done a cleaning of the pots & switches with a cleaner such as deox or similar? 99% of channel drop-outs is caused by dirty (pitted) contacts in switches.

When it happens, instead of unplugging your RCA jack and plugging it back in, wiggle and work the tape monitor, selector and speaker switches to see if it doesn't bring the channel back. If it does then it is dirty switches.

Pitted contacts in the protection relay will cause the same thing.
 
cademan said:
Welcome! Have you done a cleaning of the pots & switches with a cleaner such as deox or similar? 99% of channel drop-outs is caused by dirty (pitted) contacts in switches.

When it happens, instead of unplugging your RCA jack and plugging it back in, wiggle and work the tape monitor, selector and speaker switches to see if it doesn't bring the channel back. If it does then it is dirty switches.

Pitted contacts in the protection relay will cause the same thing.
Click to expand...

Thank you for you answer!

I had used Kontakt 60 earlier to remove corrosion and decided to try it again. Surprisingly, this time it helped - drop-outs have not occured anymore. Also, a buzz noise caused by turning knobs is mostly gone.

So I guess I just wasn't thorough enough cleaning it before.
 
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