This installation of TCS DP2X digital decoder is for HO-Scale Atlas AEM7 and was performed by TCS Customer.

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 DP2X is a drop in decoder for the Atlas AEM7 H0 locos but due to a glitch in the wiring of number board lights, it is not possible to control these lights or even do programming of the decoder. This is because the number board lights are directly connected to tracks.


To correct this problem, disconnect the number board lights from its terminals on the circuit board. The terminals are named FNBL1 , 2 for front lights and RNBL1, 2 for rear lights respectively. Then modify the wiring as follows:
1. Solder two wire ends of the number board lights together. It does not matter which end- red or black.
2. Solder the free ends of the front board lights to the diodes as shown in the pictures.

Now you can control the lights with the F0 function.


In case you want the control the lights independent of the front/marker lights then the lights have to be wired as follows:
Solder one free end of the board lights to the cathode of the diode and the other end to the solder pad on the decoder (Any pad corresponding to green. purple or brown wire can be used.

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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