Well this is frustrating ...
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I removed the screen cover from the Final unit to access the TX/RX relay and now it's working again ?.
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I couldn't see anything loose so I'm in the dark as to what's causing it.
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Maybe I just put it back together and see if it fails again.
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Incidentally what is the correct type of screwdriver for this radio? Posidriv, Philips or something else? I don't want to damage the pristine screws.
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Mike G8GYW