This installation of RTR-MB1 and WOW 121 Diesel Decoder is for HO Scale Athearn SD38 and was performed by TCS.

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-ATH-8 which was used for this installation.

RTR-MB1 Motherboard with Keep Alive™ WOW121-Diesel Decoder GEN-SH1 Speaker Kit
Click here for more information on the WDK-ATH-8 and the rest of the WOWDiesel Kits line.

Athearn SD38 prior to installation.

Begin this installation by removing the screws on each coupler and removing the coupler boxes. With these removed, grasp the sides and each end of the shell and gentle pull out to release and lift it from the frame.

The Athearn SD38 with its shell removed. Unclip the wires from the original lighting board, taking note of the wiring layout
and releasing the clip underneath the board, remove the board from the chassis.

Shown with the original lighting board removed. Next trim and tin the wires as neccessary.

Install the new RTR-MB1 and solder the motor and track connections.

With the 35 x 16mm speaker wired and inserted into the GEN-SH1 enclosure, using hot glue mount this assembly to the frame.
At this point, wire the speaker leads to the motherboard and plug in the WOW121-Diesel decoder.

Solder the lighting leads to the motherboard, following the provided wiring diagram. We added a dab of hot glue to the front frame weight to secure the wires to prevent movement and potential shorts.

In order to keep the installation neat, prevent loose wires and shorts that might result, lace the wires into a bundle for reinstallation of the shell.
Reattach the shell in reverse order, install the coupler boxes and pins and you WOWSound equipped Athearn SD38 locomotive in 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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