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I have a Technics Stereo Amplifier SU-G90 ...the source keeps switching to tuner on its own...what do u suggest..?

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The chances are the microprocessor has some lint or dust impeding the signal and switching modes. Either this or a switch is triggering for some reason. It's also possible that the cpu has a heat problem and causing the switch, and you can check that by spraying cold spray (freon) on the suspected component after it switches...just to see if it switches back. If it does, the IC is bad. You can blow the electronics out with some compressed air, and then use alcohol to clean dusty areas or legs. Toluene is the best liquid to use, but it's been outlawed for consumer usage. I've saved many a processor due to dirt between microprocessor legs, even back in the old days.
If you can get hold of a schematic, you can trace the line feed from the mode switches to the microprocessor, and sometimes you can do it without one, however, then you have to identify the tuner output, which can be cumbersome, also. In other words, one will have to figure out what is causing the problem, and unless you can spray a switch with contact tuner, you have to use a meter, or hope to get lucky with a good cleaning.
If you elect to have it serviced, get an estimate (high and low). It can be a bit high, if it's tricky.
Good luck, and hope this helps.

Posted on Jul 29, 2010

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