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The TIU is continuously sounding the whistle on TMCC and conventional engines.

It is not the transformer because I switched ZW transforms and I know the whistle switch on the new transformer works fine.  Does anyone know what is causing this problem and how to fix it?

Thanks in advance.

Al Prendergast

203 722-7851

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What channel is it?  If the TVS failed you would have an AC input short.  Are you using a VAR channel or a Fixed channel?  I am thinking variable am I correct?

Also, have you eliminated the track?  Move the effected channel to a different track.  You may have an offset based on some other item on the track.

I do TIU repairs, email in profile.  G

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