The installation for HO Scale Bachmann EMD DD40AX uses the TCS T1P-SH digital decoder and was performed by A.G.
The three pictures above show the Bachmann EMD DD40AX prior to the TCS T1P-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 T1P-SH decoder into the 8-Pin NMRA socket so that pin #1 is lined up with the orange wire.
Another picture of completed T1P-SH installation. Black electrical tape was used to fix the decoder to the chassis.
The picture above shows completed TCS T1P-SH decoder installation.
Important Soldering Tip
Please do not use any flux either liquid or paste on the mother board. Over time, the acidic properties of liquid or paste flux will begin eating away at the fiberglass PCB and will damage it. Use only Rosin-core solder or no-clean flux approved for electronics use.
TCS recommends the use of Kester "44" Sn63 Pb37, .015" diameter Rosin-core solder. Kester part number 24-6337-0007.
You can order this solder from the following retailers:
Digikey - PN:KE1110-ND
Techni-Tool - PN:488SO6775
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