This installation is for a HO-Scale Atlas C420 Ph1 high nose using a TCS WOW121-Diesel Decoder, AS-MB2 Motherboard with a KA4 Keep Alive™, and UNIV-SH4-C WOWSpeaker kit.

Important Soldering Tip:
Please do not use any flux either liquid or paste on the mother board. It will damage it. Use only Rosin core solder approved for electronics use.
We recommend to use only Kester "44" rosin core, SN63PB37, .015" diameter, part number 24-6337-0007.
This can be ordered from Techni-Tool under Techni-Tool part number 488SO157
This was performed by our friends from DCC Xpress installations.
They offer high quality WOWSound installations for a flat rate complete with free return shipping!
You can find them at:

These items are available in the WDK-ATL-4 which was used for this installation.
AS-MB2 Motherboard WOW121-Diesel Decoder KA4 Keep-Alive™ 32mm WOWSpeaker
Click here for more information on the WDK-ATL-4 and the rest of the WOWDiesel Kits line.

HO-Scale Atlas C420 Ph1 high nose prior to WOW121-Diesel Decoder, AS-MB2, and UNIV-SH4-C installation.


To start off this install, we must first remove the front and rear coupler screws as indicated above in red and their housings.
With the couplers removed gently apply outwards on each end and along the shell and lift the shell off of the frame.
Take care with the handrails as you lift off the shell off so they don't break.

The locomotive with the shell removed. At this point, unclip the wires from the original lighting board and release it from the frame.

Shown with the lighting board removed. Next, trim and tin and wires as neccessary for reconnection. Clip the AS-MB2 to the frame using
the mouting holes and solder the track and motor leads to it in the appropriate locations as indicated in the included wiring guide.

With the AS-MB2 installed.

Using foam, double sided tape, secure the KA4 Keep Alive™to the front of the rear weight as shown and solder the connections to the motherboard.

In this installation, to allow the speaker to fit onto the frame, we cut a small notch in the front bottom.
As the speaker enclosure will be visible inside the cab, we also painted it black to minimize it's appearance in the final installation.

Using the same foam, double sided tape, attach the speaker assembly to the frame as shown, taking care to route the wires to avoid
potential pinches that could in the future lead to shorts.

Next, using the original lights, we soldered the leads to the mothreboard adding a 1k ohm1/6w resistor to the anode side.
To ensure a neat and tidy appearance and to prevent pinched wired and potential shorts, we laced the wires in to a bundle using waxed lacing cord.
Lastly, we secured the front lighting assembly with a dab of hot glue, plugged in the WOW121 decoder.
The installation is now complete and you are ready to roll with WOWSound!

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