This installation of TCS A6X digital decoder is for HO-Scale Atlas GP38 older verion and was performed by Craig Zeni

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


The mechanism with the front weight and old decoder removed. The
weight must be removed to get the old decoder out and new decoder in.
At this point I tinned the wire ends on the locomotive.


The mechanism with the TCS A6X decoder installed and the wires soldered
in place. I use a 25 watt iron with a clean tip and a high quality
rosin core solder. Note that it may be necessary to *carefully* file
the mounting holes in the decoder to get it to slip over the plastic
clips on the mechanism. I had to square up the holes a little bit with
a square rat-tail file, taking great care not to damage any decoder
components or traces on the circuit board.


This photo shows both LEDs installed and the front weight fitted. Note
that the shell will not clear the rear light as shown here - the wiring
must be flush with the top of the weight. In the photos the resistors
are exposed so that the viewer can see what I have done. Before
finishing the project I will cover the resistors with heat shrink
tubing as seen on the LEDs.

The almost completed installation - the last step is the heat shrink
tubing for the resistors. Put the engine on the programming track to
make certain there are no shorts, program and enjoy the way the decoder
makes this engine perform.

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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