This installation is for a HO-Scale Alco P2K using a TCS WOW121-Diesel Decoder, RTR-MB1 Motherboard with built in Keep Alive™
and 28mm WOWSpeaker by TCS.

Kit Coming Soon! We are in the process of assembling all the items shown here into a new WOWKit.
Please check back here to see the new WOWKit when it arrives.


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 Alco P2K shown prior to installation.

    

  To start off this install, we must first remove the front screw highlighted in the above left photo in red. The entire coupler then can be carefully removed
by pulling it backwards through the coupler opening as a complete unit. The rear coupler can stay in place.

Next, carefully release the and remove bottom fuel tank and remove the four screws highlighted above in red.
With the front coupler and these screws removed, gently pulling outwards along each side of the frame, lreleasing the ladder clips and 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 Alco P2K shown with the shell off.


Unplug & remove the wires from the original lighting board and remove the 5 screws, whose locations are highlighted above in red.
Remove the board from the frame.

With the board remove, first unsolder the motor lead shown above that is attached the the metal clip. As the RTR-MB1 has a convenient motor pick up clip attached to the bottom of the motherboard, this lead will be unused

With the wire lead removed, bend the left end of this clip straight to be able to accept the RTR-MB1 motherboard.

Next, remove the cab interior and with a small cutting blade, remove the portion that is highlighted above in red.
This will allow space for a proper installation of the RTR-MB1. When complete,reinstall this piece back onto the frame.

Shown ready for the RTR-MB1 motherboard. Trim, tin or lenghten the wires as necessary.

Attach the RTR-MB1 on top of the metal clip and solder the motor and track leads to it according to the included wiring diagram.
As this locomative has only track pick up for the right side, the wire lead is jumped over as shown above. When attaching the wires to the pads, it is not necessary to insert the wires through the holes. We recommend attaching the wires flat on top of the solder pads.

Next, to facilitate the speaker mount, clip or file off flush the small post highlighted aboce in red.

Using double sided foam tape, with the 28mm WOWSpeaker inserted into the UNIV-SH2-C housing, securely mont this assembly to the top of the
frame as shown above. Solder the leads to the RTR-MB1.

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.



Next remove the top black plastic portion of the front light assembly by squeezing the two tabs found on the bottom that are inserted into the two square holes highlighted above in red. WIth this removed, lay the headlight LED into the exposed channel highlighted in blue and using a small amount of hot melt glue, secure
this LED in place.

Replace the top black plastic mount and likewise, lay the Mars light LED into this channel and secure it with a small amount of hot glue as well as shown above.

Solder these lighting leads to the RTR-MB1 according to the included wiring diagram. In this installation to allow for the Mars light function, we soldered the headlight to the FL pad as shown with a 1/6 w 1k resistor in line and the Mars lead to pad #1. As this row of pads has built in reistors, none was needed for This LED.

We have found that LED’s do not have to be placed on the end of the light tube, but can be placed anywhere against the light tube with equally good results.

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

You can now plug in your WOW121 decoder.

Lastly, in order to keep the wires neat and prevent possible shorts, 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

Now you can close up the locomotive and reinstall the bottom screws and front coupler assembly. Be sure to be mindful of wire routing and reassembly of the shell as to not damage or foul the installation. Your Alco P2K is now WOWSound equipped and 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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