This installation is for a HO Scale Walthers EMD F40PH using a TCS WOW121 Diesel Decoder, AS-MB2 NC Motherboard, KA3 Keep Alive®
and UNIV-SH1-C WOWSpeaker kit.

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:

Kit Coming Soon! We are in the process of assembling all the items shown here into a new WOWKit.
Please check back here to see the new WOWKit when it arrives.

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

HO-Scale Walthers EMD F40PH shown prior to installation.


    To start off this install, we must first remove the front coupler screw highlighted above and it's housing.
Next, remove the four additional screws shown in red above located at the corners underneath the frame.
With these removed, while gently pulling outwards at each end and along each side of the frame, lift the shell off of the frame.
Take care to release the handrails as you lift off the shell so they don't break.

The Walthers EMD F40PH shown with the shell off. Remove the four screws highlighted above in red and the wires from the original lighting board then remove the board
from the chassis. In this installation, we chose to convert the lighting from the original bulbs to LEDs, so at this point we removed the bulbs and discarded them.

With the original lighting board removed, trim, tin or lengthen the wires as necessary.

Using double sided foam tape, secure the motor mount to the top of the motor centered front to back.

Attach the AS-MB2 NC to the motor mount using double sided foam tape. Solder the motor and track pickup wires to it according to the included wiring diagram.

With the 35mm X 16mm WOWSound speaker inserted into the UNIV-SH1-C enclosure, using hot melt glue, securely mount this assembly face down into the rear of the frame.
Be sure to place it at a height so that the truck does not touch the face of the speaker. Solder the leads to the motherboard according to the included wiring diagram.

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.

NOTE: 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.

Using a small amount of hot melt glue, mount the KA3 Keep Alive® to the front of the frame as shown above and solder these leads to the AS-MB2 NC according to the
included wiring diagram.


Using a small dab of hot melt glue, insert the newly assembled front and rear LEDs into the original mounts with the face placed against the shell lens as shown above.

We have found that LED light output is brightest when shinning directly into the end of the light tube, but in some circumstances they may be placed along the length
of the tube as well with satisfactory results. In doing so, white light LED output would be least affected, while non white LED output will be more affected by placement.

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

With the LEDs in place, solder the front and rear lighting leads to the motherboard according to the included wiring diagram.

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

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 Walthers EMD F40PH 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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