The actual track voltage supplied by the DCS100 can be adjusted.
To do this, you must open the DCS100 case (this will not void your warranty).
1. Remove the DCS100 input power & disconnect all DCS100 leads.
2. Remove the two screws on the top and bottom of each side of the case.
3. Slide the gray front panel off the DCS100.
4. Be careful to avoid disturbing components other than the ones described below.
5. Locate the small yellow trimmer potentiometer behind the LocoNet B Jack and Scale Switch.
6. Use a small screwdriver to turn the potentiometer clockwise to increase the scale voltage setting.
Turn it counter clockwise to decrease the voltage setting.
7. To determine the actual track voltage, measure the DC voltage (unloaded) from either the RAIL A to the Ground Terminal and Rail B to the Ground Terminal.
Add the two voltages together to determine the approximate digital track voltage supplied.
The target voltages for the different Scale Settings are N - 12 volts, H.O. - 15 volts and O/G - 20 volts.
In practice, the range of changeable voltage is relatively small, typically one or two volts.