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

These items are available in the WDK-ATL-6 which was used for this installation.
AS-MB2 Motherboard WOW121-Diesel Decoder KA4 Keep-Alive™ UNIV-SH4-C WOWSpeaker Kit
Click here for more information on the WDK-ATL-6 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

http://www.techni-tool.com

HO-Scale Atlas C420 Ph1 low nose prior to installation.

    

For this installation, we do not have a complete photographic record, but the above photo is shown with the shell off and the unit just prior
to the speaker installation. To accomplish this, the rear weight must be removed and milled to accommodate the UNIV-SH4-C.
If this is not something you can accomplish yourself, this complete installation including the milling service
can be found at DXI Installs
here

Shown here is the rear weight, upside down, milled out to accept the UNIV-SH4-C.

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.

The ALCO C420 shown with the UNIV-SH4-C installed into the milled rear weight.

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

In order to keep the wires neat and prevent possible shorts, always 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 www.digikey.com
We use part number 802534B BK032-ND

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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