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In Reply to: A problem common in some vintage receivers: one channel posted by tinear on March 18, 2007 at 17:30:06:
I use a professional tech for this problem, and he almost always fixes it and identifies it as bad contact in the output relays. It happens way too often, but that's what it is -- dirt, corrosion, IDK. Sometimes new relays fix it, sometimes de-oxit, sometimes ???
Follow Ups:
Not just stereo equipment...I just had this same problem with a Casio Keyboard someone gave me...sound would slowly cut out and come back if the output patch cord was jiggled.Opened it up and found a miniature Omron relay on the output board that was the culprit. A spray of Deoxit took care of this for good.
I got this 2230 receiver a few days ago. Not a thrift store purchase but one I paid real money for. Today, I realized one channel was playing at a lower volume, then I was turning the volume knob up past 12 o'clock and only getting half volume.
Opened up the bottom and sprayed De-oxit into volume and balance pots - accessible from underneath, and very high-quality pots I might add, similar to Alps.
Suddenly better and more powerful sounding.While in there, I was able to see why many here on VA hold Marantz receivers in high regard.
Hope this helps others.
Pete
Certainly there are other causes than the relays, as many, maybe even most, things that can go wrong will only go wrong in one channel at a time. I did buy a radio on eBay that had half volume in one channel, and it was not a relay kind of thing. But the tip-off that it's a relay is the test of turning the volume way up. spinning the tuning dial, unconnecting and reconnecting some RCAs on the back, switching the source, and kBlam -- the missing channel comes back. I'm guessing that enough voltage will burn a hole through the corrosion for a short while.
You can also physically tap on the relay itself and see if there is a reaction. Agree, a one channel working issue could be the relay, but write off the easy stuff first.
yj
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