Author Topic: Rapido FA Unit  (Read 656 times)


  • Fireman
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  • Posts: 10
Rapido FA Unit
« on: November 21, 2017, 09:17:33 PM »
I have recently bought a Rapido FA unit.  Taking off the shell I see the DC unit has a speaker already in it with two wires tracing back to the green board.  So if a put a 21 to 9 pin adapter and install the Railpro decoder will I get sound with the way the speaker is already wired.  Or will I have to take the two brown wires from the Railpro harness and solder them to the speaker.

Thanks in advance for your thoughts.



  • Conductor
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  • Posts: 1019
    • LK&O Railroad
Re: Rapido FA Unit
« Reply #1 on: November 21, 2017, 09:58:17 PM »
Sound comes out of the 6 pin side of the LM. The 21 to 9 pin harness is for the other side of the LM. You will need to attach the brown wires to the speaker.

LK&O Railroad website

When I was a kid... no wait, I still do that. HO, 28x32, double deck, 1969, RailPro