Install an NCE SW9-SR mobile Decoder into an P2K SW1500 switcher.
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board that sits on top of the motor.
I found that at least on my layout, thanks to good design of the P2K EMD SW1500 switcher, and the well
engineered c
ircuitry of NCE’s decoder, that I did not require a keep alive capacitor. You will see in my
article that I pre-wired wire leads for the attachment of a keep alive later should my needs change.
The most difficult part of this project is removing the shell from the chassis of the switcher. See
instructions included with the P2K locomotive switcher. Remove both front and rear gear
boxes/couplers first. Basically there are five tabs, 4 on the sides and 1 on the back of the shell that need
to be pressed in, in order to release the shell. Press on the most forward ones first and slightly lift the
front of the hood then press on the rear side tabs. Move the shell forward slightly to release the rear tab
and lift up the shell. The running boards come off with the shell. Try grasping the chassis itself when
lifting up the shell.
Circuit schematic as supplied by NCE:
