MTH protoSound SD70MAC doesn't move

Douglionel

Member since
March 2012
1 posts

Posted by Douglionel on Wednesday, March 14, 2012 10:48 AM

I have a MTH 20-2221-1 SD70MAC (proto 1) that when powered lights up and the smoke machine motor operates but I have no sound or movement. I temporarily installed a 9 volt batt to see if that was the issue ,no change. I have turned the volume control to both ends of its travel, still no change. I am suspecting a burnt board but this has 2 boards. Anyone tell me which is most suspect?.

Tags: MTH

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Stourbridge Lion

Member since
October 2010
From: Centennial, CO
3,218 posts

Posted by Stourbridge Lion on Wednesday, March 14, 2012 11:33 AM

Douglionel - Welcome to trains.com! Cowboy

Darren (BLHS & CRRM Lifetime Member)

Delaware and Hudson Virtual Museum (DHVM), Railroad Adventures (RRAdventures)

My Blog

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phillyreading

Member since
January 2005
From: Lake Worth FL
4,014 posts

Posted by phillyreading on Wednesday, March 14, 2012 2:45 PM

You may have to do re-set of the circuit board, best to use an MTH Z-1000 or Z-4000 transformer to do this. I use MTH transformers with my MTH items.

Interested in southest Pennsylvania railroads; Reading & Northern, Reading Company, Reading Lines, Philadelphia & Reading.

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RRaddict

Member since
June 2011
From: Way out West
440 posts

Posted by RRaddict on Thursday, March 15, 2012 12:04 PM

I had this same locomotive with the same problem. I contacted MTH and found out it is a software problem that happens in a few locomotives and if using a Z 1000 the locomotive wont move. MTH said to send it back and they will fix it at no cost as it is a software issue that was a manufacturing defect.

Can't stop working on the railroad!

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