RailPro > RailPro Specific Help & Discussion

Installation in a Bachmann DCC GP9

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nodcc4me:
Jim, try unplugging the 8-pin from the board and reverse it. That shouldn't make a difference but I have found that in some locomotives the headlight will only work if it is plugged in a certain way. Maybe you'll get lucky but those boards are usually plug and play. If you are going to add lighting later, you will most likely have to remove the board and hard wire it.

Pequeajim:
I thought I did try rotating the plug 180° if you're looking down on it witchwood innocence reverse everything. It looks like the NMRA standard is such that if it's reverse it's not going to hurt anything so I'll try again.

G8B4Life:
Rotating the plug 180° will do nothing as the orientation of the plug has nothing to do with RF suppression.

The RF suppression (inductors and capacitors) most definitely can cause issues, and seems to cause more of a problem for RailPro LM-x's than it does many DCC decoders, possibly because RailPro uses a much higher frequency to drive the motor than some DCC decoders.

Personally I'd remove all the RF suppression components (the two inductors and the capacitors) but I have read that just removing the capacitors will suffice. According to this Soundtraxx document (http://www.soundtraxx.com/documents/appnotes/bachmann_gp9.pdf) the capacitors are attached to each motor lead. Try removing just them first and see if everything improves, if not then you'll need to try removing the inductors as well. If you remove the inductors you'll need to jumper where they were with a short piece of wire.

- Tim

Pequeajim:
Thanks Tim.  I will give that a try.


Jim

Pequeajim:
Worked!  Now to just add the sound.

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