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TS-870S no TX


 

Hi everyone
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I bought this radio from a dealer a year ago. It is in immaculate condition despite its age and worked flawlessly until now.
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It would start to drop out of TX occasionally during a QSO and I initially suspected my PTT switch.
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Now it won't transmit at all. I have tried PTT on the front panel mic connector, the rear ACC2 socket, the SEND button and AT TUNE.
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Any ideas where I should start looking for the fault?
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--
Mike G8GYW

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