This installation is for HO-Scale Atlas GP38-2 using a WOW121 decoder, AK-MB1 motherboard with Keep Alive™ and
UNIV-SH1-C WOWSpeaker kit by TCS

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-3 which was used for this installation.
AK-MB1 Motherboard with Keep Alive™ WOW121-Diesel Decoder UNIV-SH1-C Speaker Kit
Click here for more information on the WDK-ATL-3 and the rest of the WOWDiesel Kits line.

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

The Atlas GP38-2 prior to installation.



To begin this installation, first remove the screws as highlighted above in red at each end of the locomotive and remove the couple box.

With the couple boxes removed, gently grasp the shell on the sides and while pulling outward on each end, carefully lift the shell from the chassis.

Remove the wires from the original lighting board and remove this board from the frame. Trim, tin or lengthen the wires as necessary.
We reused the original LED's in this installation.

Attach the AK-MB1 motherboard to the frame, solder the motor, track and lighting leads to it.

TCS motherboards include on board current limit resistors for LED use. There is no need to apply external resistors for LED use. 

After inserting the 35mm x 16mm speaker into the INT-SH1 enclosure, using double sided foam tape, mount this assembly into the top of the shell
and solder the leads to the motherboard. Be sure to place the UNIV-SH1-C enclosure to fit between the weights to allow space for the shell to close.

If your speaker enclosure installation covers the portholes on the enclosure, we recommend adding new port hole(s) similar to the original porting. Be sure that the new portholes are the same size and amount of the original and are vented freely into the locomotive We have found introducing a port of the correct size greatly increases the volume and sound quality of the installation. Too much or too little porting decreases the sound quality.

You can now plug in your WOW121 decoder.

Lastly, in order to keep the wires neat and prevent possible shorts, lace the wires into a bundle using lacing cord, which is a wax impregnated string 
used for wire bundling and making harnesses. There are many choices of lacing cord available from Digikey
We use part number 802534B BK032-ND

Reassemble the shell onto the chassis and replace the coupler boxes and screws. Be care to avoid pinching and fouling wires.
Your Atlas GP-38-2 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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