MS - SOUND decoders MS440 to MS990 and MN - NON-SOUND decoders MN170 to MN340 Page 11
ATTENTION:
In vehicles equipped with a 6-pin NEM 651 interface (where a decoder like MS490N or MS500N is plugged
in),"functions" (lights, ...) are NOT connected to the decoder plus pole (because there is no pin), but hang on
the "artificial plus pole" (2 diodes) of the loco board. Thus, an external energy storage (e.g. STACO1 and Gold-
caps) does NOT affect the lights (they flicker when the track is dirty ...), but "only" on motor and sound. At the
same time such an "artificial plus pole" hinders the functional safety of ABC.
POSSIBLE REMEDY:
The positive poles of the consumers would have to be disconnected from the "artificial plus pole" and connected
to the "common plus pole" of the decoder by wire.
MS490, MS490R, MS490F Top side wired
MS490N, MS490L NEM 651
Energy storage solution with STACO1 on the MS490…
MN170, MN170R, MN170F Top side, wired . NON-SOUND
MN170N Top side, with NEM 651 . NON-SOUND
… resp. with ELKO or Tantalum on the MS490, …R, …F, …N
Bottom side
Rev. B
produced
from August
2022
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