This installation is for a HO-Scale Atlas SD-26 using a TCS WOW121-Diesel Decoder, AS-MB2 Motherboard, KA4 Keep Alive™
and 30mm WOWSpeaker kit with lighting connector plugs by TCS.
HO-Scale Atlas SD-26 shown prior to installation.
To start off this install, we must first remove the front and rear coupler screws highlighted above and their housings.
With the couplers 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 Atlas SD-26 shown with the shell off.
Unplug and unsolder the wires from the original lighting board then remove the four screws highlighted above in red and remove it from the chassis
Shown with the lighting board removed.
Remove the unneeded orange caps highlighted above in red on top of the motor. Also remove the screw and frame member to the right highlighted in blue.
Discard these pieces.
Attach the AS-MB2 to the motherboard mounting clip and using holt melt glue, mount the clip to the frame as shown above to the top of the front
frame and on top of the motor. Plug in the track, motor and lighting lead wires to the AS-MB-2 according to your included wiring diagram.
On the rear lighting board, remove the screw highlighted above in red and lift out this board.
Unsolder the wires connected to the rear board and re solder the new 2 pin connector as shown above to the right.
Unsolder and remove the front lighting board wires and solder on the new 2 pin connector as shown above.
Next, remove the screws holding the speakers on each side as highlighted above and remove and discard the speakers.
Using hot melt glue, mount the KA4 to the chassis as shown above and solder the wire leads to the AS-MB2 according to the included wiring diagram.
For this photograph, the train is facing backwards to show the opposite side. Mount the 30mm speaker into the frame opening and secure it
with the original retaining clip. Solder the leads to the AS-MB2 according to the included wiring diagram. As the shell is a very tight fit, it is
important to mount the speaker on to this side only.
On the opposite side, insert the included plug and secure it with the original retaining clip.
You can now plug in your WOW121 decoder.
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 Atlas SD-26 is now WOWSound equipped and ready to roll!
Click here for important information on properly Stripping and Tinning wire