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Technics SX-U90 Tabs not working

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  • Technics SX-U90 Tabs not working

    This is my first foray into the Organ Forum, so hope this is the right way to do it !

    There is a group of four upper manual voice tabs on my SX-U90 whichcan don't work, although one of them is permanently active. Does anyone recognize this fault/ can point me in the right direction to fix it.
    The actual tab switches and associated diodes check out OK. Everything else on the organ works normally.

    Help !
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