This installation is for a HO-Scale Atlas H-24-66 using a TCS WOW121-Diesel Decoder, AS-MB2 Motherboard and 32mm WOW Speaker.

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 H-24-66 prior to WOW121-Diesel Decoder, AS-MB2 and 32mm speaker installation.


To start off this install, we must first remove the front and rear couplers screws as indicated above and remove their housings.
With the couplers removed gently pull apart the shell at the two ends and along the sides and lift the shell off of the frame.
Take care with the handrails as you lift off the shell so they don't break.

Shown with the shell off. Unplug the JST connectors and remove the original lighting board.

With the board off, take note of the wiring to be sure and replace it in it's correct location.

Attach the AS-MB2 onto the motor mount tabs and plug the JST connectors in the appropriate locations.

Next, solder the KA4 keep alive to the AS-MB2 motherboard and using hot melt glue, secure the KA4 to the inside top of the front of the shell.

With this done, solder the speaker wire leads to the AS-MB2 motherboard and place the 32mm speaker in the frame, securing it with hot glue.
You must be very careful to avoid getting glue on the speaker cone. Glue on the speaker will ultimately cause it to produce no sound and fail.
Plug in your WOW121-Diesel decoder.

Lastly, in order to keep the wires neat and prevent possible shorts, lace the wires into a bundle using waxed lacing cord.
Now you can close up the locomotive and reinstall the coupler assemblies. Be sure to be mindful of wire routing and reassembly of the shell as to not damage
or foul the installation. Your Atlas H-24-66 is now WOWSound equipped and ready to roll!

Other solder tips: When stripping wire, only strip a tiny little bit of the insulation. Strip no more then a 1/64 of an inch. When the wire gets tinned with solder the insulation will shrink back more. Try to not expose any more wire then half the length of the solder pad at most. In no case should solder or exposed wire wire ever be outside the boundary of the the solder pad you are attaching a wire to.
Click here for important information on properly Stripping and Tinning wire

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