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Memory part of a Technics tuner does'nt work

I need to repair the memory part of a Technics Stereo Tuner, model no. ST-S707 that stores the radio stations.

When switched off, the station info is lost or not remembered.

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Identify the main area on the pc board, and look around for a odd shaped Electrolytic capacitor. It might even have odd printed board number IE: mc500, not c500, for example.
If you find one it could be a Memory Retention Capacitor. They often have a low value 0.22uf and low voltage 5.6 for instance. It could have failed and so not supply the chip that stores the information, with power when switched off.
I can't say it will have one, but it's worth a try. They are in the Maplin catalogue for under £5!

Posted on Nov 18, 2009

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Posted on Jan 02, 2017

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