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The Latest SD70MAC by Athearn is a very fine model. It is unique in that it
has a built in 1.5 voltage regulator to power all the bulbs. It works for
both DC and DCC operation.. Decoder installation is very easy. The loco
comes supplied with the 9 pin connector already solder into the lighting
board. Remove the jumper circuit board supplied with the loco from the
connector and plug your TCS decoder directly in. See photo below. No
soldering required. From the
factory the ditch lights are controlled by button one. To allow for
alternately blinking operation follow the instructions below.
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Click on Photo to enlarge TH141 (T4X) Decoder shown installed in AthearnSD70MAC locomotive.
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There is no need to change bulbs to complete decoder installation.
All the light bulbs supplied with the loco use 1.5v bulbs and are powered from a built in 1.5v regulator on the light board.
From the factory both ditch lights are hooked together and will operate on and off by using button one.
To provide alternately blinking ditch lights, the bulbs must be separated at the point marked F1_N and F1_P. See enlarged photo of circuit board above.
One bulb then needs to be hooked to the terminals marked F2_N and F2_P or the holes marked 2X and 2Y. The other bulb remains connected to F1_N and F2_P.
Use the T4X or T6X decoder as they support Blinking Ditch lights. All X series decoders have improved ditch light operation by allowing more prototypical fading on/off.
Change these CV’s to set up your TCS decoder for alternately blinking Ditch lights.
CV36=4
CV51=42
CV52=43
Use button one to control on/off of Ditch Lights and button two or five to activate blinking. You can select which button activates the blinking by changing the value in CV124. refer to table 19 in your decoder literature.
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Entire contents © Copyright Train Control Systems 2003-2007 • Last Modified: October 24, 2004
