This installation of TCS DP2X Decoder is for HO Scale Atlas C425 and was performed by A.G.
The three upper pictures show the beautiful Atlas C425 with its shell on.
Unscrew the front screw (circled in red)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. This picture illustrates the original light board with the DCC-ready plug installed. In the upper left corner of the DCC socket you can see small triangle mark - that is the "pin # 1" indication. Plug the DP2X into the DCC socket so that the decoder's pin #1 (see the manual that comes with the decoder for more info) is lined up with " first pin indicator" of the board. 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 back to the chassis.
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