MTH Protosound help

I have a PROTO 1 unit, that lost the chugging sound when using my Lionel ZW transformer. I also can not get the chugging sound any longer even with the MTH Z-4000 transformer. HOWEVER, I can get the chugging sound with the MTH Z-500 transformer.

Can't figure this out......and yes, I changed the battery in the tender.

Thanks, LOU

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The battery has to be a 8.4 volt, fully charged.

Do a full reset to defaults and start over with your settings. This is an odd problem, the Z-4000 & ZW are the proper true sine wave units, PROTO 1 is usually fussy w/ the Z-500.

Try a MRC or CW trans to see if you can duplicate.


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Humm.....................the battery is fully charged. Thanks for the help.

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The very old Lionel ZW transformers have full sine wave power with a poor circuit breaker.

The new & current Lionel ZW transformers use a chopped sine wave and they do mess up the MTH Proto 1 engine programing... The new Lionel ZWs have fast acting circuit breakers.

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Dennis Mayer

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