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No LED front light control

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  • Member since
    January 2002
  • From: Redwood Falls MN
  • 90 posts
No LED front light control
Posted by draftingplans on Saturday, December 27, 2014 8:59 PM

I installed a NCE P2K-SR decoder in a RS-27 Proto 2000 locomotive a month ago and when I installed it I made the mistake of not installing resistors to the LED's with the locomotive and I burnt out the LED's. Bang Head
I installed a pair of LED's today with resistors and the lights work but I have a problem with the front light and that I cannot turn it off. It stays on all the time regardless of direction, turning light off/on with my NCE throttle.
I use Decoder Pro and reset the decoder to factory default, put on the track and the front light never turns off. I configured the decoder lights to how I like to run them and still nothing changes. The rear light works just as it is suppose to but not the front.

Any thoughts why I cannot get the front light to work properly?

Thinking I have a damaged function 1 of my decoder but not sure.

Thanks,

Barry

  • Member since
    April 2004
  • From: Ontario Canada
  • 3,574 posts
Posted by Mark R. on Saturday, December 27, 2014 9:03 PM

That's usually an indicator of a damaged function output.

If you have any remaining function outputs available, connect the front light to it and re-map it to be the headlight.

Mark.

¡ uʍop ǝpısdn sı ǝɹnʇɐuƃıs ʎɯ 'dlǝɥ

  • Member since
    January 2002
  • From: Redwood Falls MN
  • 90 posts
Posted by draftingplans on Saturday, December 27, 2014 9:06 PM

Thinking that function was the problem so will use one of the other functions to the light when I get to it tomorrow.

Thanks,

Barry

  • Member since
    February 2002
  • From: Reading, PA
  • 30,002 posts
Posted by rrinker on Saturday, December 27, 2014 9:59 PM

 Yup, stuck on = blown function 'output'. The surge when it blew the LED without a resistor is usually enough to blow out the transistor on the function as well.

                    --Randy


Modeling the Reading Railroad in the 1950's

 

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

  • Member since
    January 2002
  • From: Redwood Falls MN
  • 90 posts
Posted by draftingplans on Sunday, December 28, 2014 9:02 AM

Mark & Randy,

Thanks for the information as you two confirmed the problem I suspected.

I changed the function output of that decoder as per your information and everything works as I want.

This site is just plain AWESOME when you need/want answers! Smile

Thanks a bunch

Barry

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