This installation of TCS A4X Decoder is for HO Scale Atlas RS1 and was performed by N.G. and J.M.

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

Please note: while this locomotive is manufactured by Atlas the frame is made by Kato.

First remove the shell by squeezing on either of the locomotive and rocking the shell back and forth until it lifts from the frame.

Next remove the default lighting board from the frame and attach orange and gray wires to the motor tabs as shown above. Shrink wrap the tabs so that they wont short out the decoder.

The next section depends on whether or not you have a new A4X or an older A4X. The newer A4X's have onboard resistors, and the older A4X's do not. I will refer to these as

Style A: New A4X with onboard resistors

Style B: Old A4X WITHOUT onboard resistors.

Style A: Solder two blue wires to the common pad as shown below, and attach a yellow and white wire to the pads shown in the picture below and displayed in your literature on the diagram for installing LED's. Next solder the motor tabs to the orange and gray as shown below.

Style B: Solder the A4X to the white, yellow and blue wire as shown below, and diagrammed on your literature. Next solder the motor tabs to the orange and gray as shown below.

Next we used the 2 Pin Quick Connectors and the Surface Mount LED's to attach to the lighting tubes. We connected each LED to a separate two pin connector. Next we pointed each LED into the light tube and used electrical tape to hold it in place.

Style A: You do not need to put any resistors in at this point.

Style B: Cut one lead from the quick connector and solder a 680 ohm resistor in series.

Finally attach the other side to the quick connector to the lighting wires from the decoder. Make sure you are properly aware of the polarity so the LED will work.

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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