This installation is for HO-Scale Stewart F7A uses the TCS AK-MB1 Motherboard, WOW121-Diesel Decoder, and UNIV-SH4-C Speaker Kit 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-3 which was used for this installation.
GEN-MB1 Motherboard with Keep Alive™ WOW121-Diesel Decoder UNIV-SH1-C Speaker Kit
Click here for more information on the WDK-ATH-3 and the rest of the WOWDiesel Kits line.

Stewart F7A shown prior to decoder installation

Start by removing the front coupler screw and coupler box. Next, spread the shell and lift it off of the chassis.

Shown with the shell removed. Next, remove the wiring and motor connection tabs from the original lighting board and lift it from the frame.

Shown with the lighting board removed. Trim and tin the wires as neccessary. In this case, wire needed to be splice onto the track pick up leads and solder points established.

Soler a connection point on each of the original motor tabs and insulate them with shrink tubing.

Clip the AK-MB1 motherboard onto the motor just as the original lighting board had been attached. Solder the track and motor leads as indicated in your wiring diagram.

Next, using foam, double sided tape, mount the completed UNIV-SH4 speaker assembly onto the frame and solder the speaker leads to the AK-MB2 motherboard.

In this installation we used a sunny white 3mm LED to replace the original bulb lighting. As the AK-MB1 has built in 1K resistors, this gets soldered onto the motherboard
as indicated in your wiring diagram.

Using a small dab of hot melt glue, we secured this LED onto the back of the headlight light tube.

With the motherboard and speaker wired in you can install the WOW121-Diesel decoder. In order to maintain a neat appearance and prevent loose wires which could result in shorts, using waxed lacing cord, bundle the wires into a harness. replace the shell, and re-attach the front coupler.

Your WOWSound installation is complete and ready to run.

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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