Intermountain N-Scale F3A with a TCS IMF4 decoder installed - performed by J.M.
First remove the screw (highlighted below) which is holding the front coupler in place and slide the coupler out of the shell.
Once the coupler has been removed gently rock the shell back and forth until it lifts off of the chassis. You should now see the orinial lighting board as shown in the image below.
Desolder the wires from the original lighting board paying mind to their location on the board. It is crucial that these are attached to the IMF4 in the same orientation as they were on the original lighting board. Next, remove the screws from the original lighting board, remove it from the chassis, and place the IMF4 into the chassis, oriented it the way the original lighting board was. Use the screws to attach the IMF4 in place and solder the LED wires to the board. Remember to make sure that the wires are attached to the IMF4 in the same order as they were on the original lighting board. Below you can see the completed installation.
Finally, reattach the shell and you are ready to run your locomotive.
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
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