The installation is for HO Scale Bachmann EMD DD40AX . It uses TCS T4XP-SH digital decoder and was performed by a 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 pictures above show the Bachmann EMD DD40AX prior to the TCS T4XP-SH installation.


Using phillips screw driver, remove the front screw of the oil tank.


Using phillips screw driver, remove the rear screw of the oil tank.


Using phillips screw driver, remove the front copuler pocket.


Using phillips screw driver, remove the rear coupler pocket.


The four circled in red screws holds the chassis together with the shell. They all need to be removed prior to the decoder installation.


Here is a picture of the original light board after the shell removal. The original Bachmann decoder can be seen between the motors in black shrink wrap.


Here is a close up of the Bachmann decoder.


Remove the original 8PIN plug together with the Bachmann decoder.


The picture above shows the chassis with the Bachmann decoder removed.


Plug our T4XP-SH decoder into the 8PIN NMRA socket so that pin #1 is lined up with the orange wire.


Another picture of completed T4XP-SH installation. Black electrical tape was used to fix the decoder to the chassis.


The picture above shows completed TCS T4XP-SH decoder 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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