dynaco: FM-3; Dynatuner

Hello everyone .

I have a problem with one dynaco fm3 . The discriminator transformer is unalignable , I can't get less than -2,5v  on eyelet 32 so the signal does not pass ( normally there should be at least -8v)

The rf board , the if board and the multiplex section are working fine , the only problem seems to be the discriminator transformer itself .

I also opened the transformer , refreshed the solder joints and  tried to replace the pair of diodes inside the transformer  and the 33pF capacitor but  no success

Does anyone have any idea of what the problem should be and how to solve ?

Thank you , Antonio

 

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Hi Antonio, do not quite understand the problem, the FM does not work, you hear little or distorted?

regards

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Thank you for your reply , the tuner is working but the sound is weak and distorted , as the discriminator is un-alignable

All the rest of the tuner is working fine ,  RF , IF ,stereo decoder and the audio output are working , all the voltages through the tuner are correct

Thank you very much , best regards

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