This installation is for a HO-Scale Atlas DASH 8-40B using a TCS WOW121-Diesel Decoder, AS-MB2 Motherboard with built in Keep Alive™, and 28mm WOWSpeaker.

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 Atlas DASH 8-40B prior to WOW121-Diesel Decoder, AS-MB2, and 28mm speaker installation.


To start off this install, we must first remove the front and rear coupler screws as indicated above and their housings.
Once that is complete, grasp either end and along the shell and gently pill out to lift it off of the chassis.

With the shell off, we can now remove the factory light board. First remove any wire clips and disconnect the wires from the board.
Once the wires are loose, the factory light board can easily be unclipped.

Shown with the factory light board removed, we can now clip in the AS-MB2.

With the AS-MB2 mounted and the JST connectors installed in the mounts

Next, using foam, double sided tape, mount the KA4 keepalive onto the rear of the front weight as shown and solder the wires to the AS-MB2 motherboard as in your included wiring diagram. Remove the rear weight at this time to facilitate mounting of the speaker assembly.


Using hot glue, mount the 28mm speaker into the housing and place this into the rear weight as shown. Solder the speaker wires onto the motherboard onto the speaker pads. 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.

In order to retain as much rear weight as possible and enhance the sound output, using a file, cut a small notch in the weight on the opposite side of the speaker as shown above in red, to allow the speaker wires to easily pass through and re-insert this weight into the frame.

In order to maintain a neat appearance and prevent shorts, lace the bires in to a bundle with waxed lacing cord. With all three main components mounted, we can now 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 DASH 8-40B in now WOWsound equipped and reay 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

Like us on Facebook Subscribe to our YouTube Channel Join our newsletter
  Back To Top
Entire contents © Copyright Train Control Systems 2004-2018