This installation of TCS MC2 Decoder is for HO Scale Bachmann Spectrum Thomas The Tank Limited 2002 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

The three upper pictures show the Bachmann Spectrum Thomas The Tank Limited 2002 prior to the MC2 decoder installation.


Remove both screws circled in red (see the two upper pictures)


Remove the front screw (circle in red)


Remove the rear screw (circle in red)


Gently separate the wheels from the shell being careful not to damage the power pick-up wires.


Remove the screw that holds the shell and the motor compartment together (circled in red)


Gently, lift the locomotive shell up as shown in the picture above.


Remove the engine compartment by removing the two silver screws and by sliding it off of the shell.


Remove both of the screws (circled in red) that hold the original light board.


Here is the picture of the locomotive with its shell removed


Close-up picture of the original light board.


Desolder all wires (brown, orange, black, red) from the light board


Pick up the harness (that comes with the MC2 decoder) and solder its orange wire to the orange wire of the motor and solder the brown wire of the motor to the gray wire of the decoder's harness as shown in the picture above. Make sure you isolate them with electrical tape, Kapton tape or a shrink wrap (used in the example above).


Do the same for the power pick-up wires. Solder the red power pick-up wire to the red harness wire, and black power pick-up wire to the black harness wire. Isolate the contacts.


Gently insert the motor compartment into the shell and install both screws (circled in red) that hold it to the shell.


Place the decoder with its harness exactly as shown in the picture above.


Gently put the shell back together and install all those screws that you removed on the beginning of the installation.



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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