This installation is for HO-Scale Athearn Genesis SD-70M uses TCS A6X Digital Decoder and was performed by A.G.

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

NOTE: This locomotive can easily take the T4X decoder which is a much simpler installation. Follow the link here, for instructions on performing the installation.

The three upper pictures illustrate the beautiful shell of Athearn Genesis SD-70M prior to the TCS A6X deocder installation.


Unscrew the front screw as well as the back one that holds the coupler pockets to the chassis and remove both coupler pockets.


Grasping the shell by the solid area between the grills, lift the shell straight up and off of the chassis. Be careful not to break the wires for the lights.


Here is a picture of the original light board.


Desolder all wires that come to the original light board, remove the original light board.


Using the manual that came with A6X decoder solder wires to the decoder's pads.


Hold the shell in one hand and the chassis in your other hand. Lining up the front of both pieces, lower the shell onto the chassis, keeping the lower edge of the shell parallel with the chassis. Do not forget to attach both couplers.

For the ditch lights we used Green and Violet function. Following values were programmed into the A6X decoder:






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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