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Short problem with new P2K SD7

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  • Member since
    June 2007
  • From: Indiana
  • 3,549 posts
Short problem with new P2K SD7
Posted by Flashwave on Sunday, January 17, 2010 9:03 PM

Last night was the first time it's ever been out of the box, and Hi-Presto, it's shorting the club's DCC layout. I've done nothing to the inside, haven't opened it up. It's still DC set up. Works on DC fine.

Took it to the trainclub again today, had an expert look at it, he couldn't find anything that looked out of place, and it ran on the test track as DC.

What's up? Is there a plug/insulator/gremlin that I need to extract? I don't have a decoder yet to plug in, I'd like for now to just be able to put it on and take off.

-Morgan

  • Member since
    December 2008
  • From: Mount Vernon WA
  • 968 posts
Posted by skagitrailbird on Sunday, January 17, 2010 10:53 PM

 What DCC system does your club use.  Not all support operating a non-decoder equipped locomotive.

 

Roger Johnson
  • Member since
    June 2007
  • From: Indiana
  • 3,549 posts
Posted by Flashwave on Monday, January 18, 2010 12:02 AM

skagitrailbird

 What DCC system does your club use.  Not all support operating a non-decoder equipped locomotive.

 

Digitrax. I KNOW that's not the issue, as others can and have run DC on it before

-Morgan

  • Member since
    February 2002
  • From: Reading, PA
  • 30,002 posts
Posted by rrinker on Monday, January 18, 2010 7:34 AM

 Since it works on DC, it's probably the particular way they did the circuit board for directional lighting. Is this the old release, or a brand new one? For the old one, the sheet in with the instructions that talks about installing DCC will show that you have to cut traces - don't do this unless you install a decoder, I'm just trying to figure out if you have an older version or some newer one. I installed a decder in one of the old ones like that, I don't remember if I tried to run it on address 0 or just went ahead and installed the decoder.

                                    --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
    June 2007
  • From: Indiana
  • 3,549 posts
Posted by Flashwave on Monday, January 18, 2010 12:23 PM

rrinker

 Since it works on DC, it's probably the particular way they did the circuit board for directional lighting. Is this the old release, or a brand new one? For the old one, the sheet in with the instructions that talks about installing DCC will show that you have to cut traces - don't do this unless you install a decoder, I'm just trying to figure out if you have an older version or some newer one. I installed a decder in one of the old ones like that, I don't remember if I tried to run it on address 0 or just went ahead and installed the decoder.

                                    --Randy

I'll look into that. I did check the instructions, it did say something about removing the board,. It's one of the grey limited edition boxes, if that gives you a timeframe. There is a nine-pin plug at the end of the long hood with a partial circuit board attached to it.

-Morgan

  • Member since
    April 2009
  • From: Sweden
  • 1,468 posts
Posted by Graffen on Monday, January 18, 2010 4:23 PM

 It could also be like the P2K GP18 I Bought, it worked when I tried it on DC but shorted when I installed DCC in it. It was the wheel axles that shorted against each other in the middle!! Some new gears had that sorted.

Swedish Custom painter and model maker. My Website:

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  • Member since
    February 2002
  • From: Reading, PA
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Posted by rrinker on Monday, January 18, 2010 5:04 PM

 That's the newer style then, which ordinarily should be fine other than the buzz when operated on DCC. Check the other suggestions, although I'd think a short in the axles would be a short on DC or DCC.

                                 --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
    December 2006
  • 311 posts
Posted by 1948PRR on Monday, January 18, 2010 7:39 PM

Graffin has a point.

I have severalGP7 and FA units.

When I installed DCC decoders. I had shorting issues that were very difficult to trace, and they ended up being those axles shorting in the center. The wheels were in guage, but on the close side.

After twisting them out to the loose side of the guage, the shorts went away.

They had previously ran on DC.

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