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Please Note: Roundhouse has been bought out by Athearn and the new run of
EMD 40's has had this problem repaired. As such, if you attempt to
follow these directions on a new model 40 it will fry the decoder. If you
have an EMD 40 in a green box it is from the new Athearn run and is safe to
run without the following repairs. However, if your EMD 40 is in a yellow or
a red box it is from the Roundhouse runs and requires some tweaking before
decoders can be installed. Important note! The
directional lighting diodes mounted on the locomotive DCC plug board are
mounted backwards! Do not plug a decoder into the socket and turn on
the lights. You will instantly fry the decoder! Please carefully read
all instructions below. Our MC2 decoder with 1" harness will fit
beautifully inside this "Critter". It is "Plug N Play". Click on decoder
installation photos below for close up images. As of January 2006 we have
heard the second release of this loco has the problem with the reversed
diodes corrected.

Click on any photo below
to enlarge the picture and get more information.
Important
note. Click on this photo to read about wrong way directional diodes and
smoking decoder.
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