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Replacing and MTH DCS decoder

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  • Member since
    December, 2018
  • 1 posts
Replacing and MTH DCS decoder
Posted by espeedcbc on Monday, December 31, 2018 2:45 PM

Can anyone advise on replacing the MTH factory decoder in an HO GP-35?  I love the loco, but it seems since I have an NCE Power Cab system, the DCS in the loco is more difficult to deal with.  My Athearn Genesis and BLI locos run great.  I just need some advice on dealing with the MTH DCS equipped loco.  I am fairly new to all this but I am pretty sure I am capable of changing a decoder if that is the way to go.  Thanks for you comments.

  • Member since
    May, 2010
  • 4,523 posts
Posted by mbinsewi on Wednesday, January 02, 2019 3:18 PM

I think you should look to MTH, check out their web site, see if they have a servicing or troubleshooting section, you know, repairs, adjustments, replacing parts, manuals, etc.

Your problems are like others in here that have tried to run DCS with DCC.

Mike.

  • Member since
    February, 2002
  • From: Reading, PA
  • 25,632 posts
Posted by rrinker on Wednesday, January 02, 2019 5:18 PM

 My problem with my MTH FAs doesn;t really have anything to do with running the DCS loco on DCC, the control is fine. What are yoou trying to do to it, outside of changing the address to the cab number? My real issue with the thing is that if there is a power interruption, the sound cuts out, and needs the F key to turn it back on. Fine, except if the sound cuts out on just the A and not the B, hitting the F key starts up the A but shuts down the B. 

 Replacing the decoder is not simple, because in yet another BRILLIANT (that's sarcams, son, sarcasm, i say) engineering move, the LED lights in MTH locos use a NEGATIVE common. DCC is POSITIVE common. Since the LEDs are all on little circuit boards in the loco, you have to replace all those with individual LEDS (in some cases you can cut traces on the light boards and rewire it). Bottom line is I will probably just get rid of the MTH locos and put sound decoders in my P2K FAs, an easier task.

                                          --Randy

 


Modeling the Reading Railroad in the 1950's

 

Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.

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