Atlas GP7

Scale:
HO Scale


This installation uses the following decoder:

A4X



This installation of TCS A4X Decoder is for HO Scale Atlas GP7 and was performed by A.G.

The three upper pictures show the beautiful Atlas GP7 with its shell on.
The three upper pictures show the beautiful Atlas GP7 with its shell on.
Here is the picture of the original light board.
Here is the picture of the original light board.
Remove plastic isolations from all pins and remove all wires including wired LEDs
Remove plastic isolations from all pins and remove all wires including wired LEDs
Here is the picture of the original light board removed from the chassis.
Here is the picture of the original light board removed from the chassis.
Place A4X on the chassis' clips and using the manual that came with the decoder, solder all wires as shown in the picture above. Both LED lights came with voltage limiting resistors.
Place A4X on the chassis' clips and using the manual that came with the decoder, solder all wires as shown in the picture above. Both LED lights came with voltage limiting resistors.

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 than a 1/32 of an inch. When the wire gets tinned with solder, the insulation will shrink back more. Try to not expose any more wire than 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