This installation is for a HO Scale Athearn F7A Early frame.
|These items are available in the WDK-ATH-10 which was used for this installation.|
|RTR-MB1 Motherboard with Keep Alive™||WOW121-Diesel Decoder||UNIV-SH4-C Speaker Kit|
|Click here for more information on the WDK-ATH-10 and the rest of the WOWDiesel Kits line.|
With milling of the frame, they have been able to utilize a
RTR-MB1 motherboard, WOW121 diesel decoder and UNIV-SH4C WOWSound kit
HO-Scale Athearn F7A Early frame shown prior to installation.
The Athearn F7A Early frame shown with the shell off. Remove the screw highlighted above in red on either side from the weight and remove it from the chassis.
Save these screws for later use. To allow a space for the motherboard and decoder, the frame must be milled as shown below to keep all the components inside the original top of the weight.
With the top weight removed, the frame shown pre and post milling.
Remove the original track pick up bars along with the front light assembly to prep the locomotive for the new motherboard.
Remove the four screws located on the bottom of the frame and carefully remove the motor.
Remove the motor pickup clip from the bottom of the motor, flatten the two bent out tabs and solder a motor pick up to the 'top' of the clip. Be careful when removing this as there is a small spring located underneath that will be released when you do. With the new motor pickup soldered in place, insulate this connection with a piece of Kapton tape to prevent shorts.
Reinstall this clip and the motor into the frame, reversing the removal instructions.
The RTR-MB1 has a motor pick up clip pre-attatched to the bottom, so mounting it onto the locomotive could not be easier.
With the motor back into place, clip the RTR-MB1 to the motor and solder the motor and track pickup wires according to the included wiring diagram.
Using small lengths of TCS 3/32" and 3/64" shrink tubing, insulate these solder leads if needed.
Solder a new track pick connection point to the original light frame and another to the top of each opposing track pick up.
In this installation, we replaced the original lighting with a LEDs, one for the headlight and a second as a Mars light. Using a small amount of hot melt glue, mount these
LEDs into the front top of the shell as shown above. We chose to isolate the light outputs from each other with a small piece of electrical tape over the Mars light.
With the 25mm X 14mm WOWSound speaker inserted into the UNI-SH4-C enclosure, mount this assembly to the rear, top of the shell as shown below.
With these componenets in place, solder the wire leads to the motherboard according to the included wiring diagram. 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.
The RTR-MB1 and GEN-MB1 have on board 1.5volt power supplies to conveniently power all the original 1.5volt bulbs that come with your Athearn locomotive. The front headlight and rear light pads are configured for 1.5volt use. Additional 1.5volt pads are available for other connections for ditch lights etc. If you prefer to use LED lighting as an option, use the LED solder connection pads. Current limit resistors are built into the board so no external resistor are needed for LED use.
You can now plug in your WOW121 decoder.
The installation shown complete. We placed a small piece of Kapton tape over the installation before replacing the weight, to insulate these two surfaces from potential shorts.
Using care, replace the top weight, routing the wires properly to avoid pinching the wires when doing so. Replace the original weight screws.
Now you can close up the locomotive. Be sure to be mindful of wire routing and reassembly of the shell as to not damage
or foul the installation. Your Athearn F7A Early frame is now WOWSound equipped and ready to roll!
Click here for important information on properly Stripping and Tinning wire