@Jon G posted:These boards have a problem where the solder pads on the voltage regulator are too close together and short. Usually the LEDs are OK (I just repaired two in the last week); test them with a 9v battery and 220 ohm resistor. Direct replacement boards are not available, but we use the 6v lighting kit for dummy A-Units, remove the jumpers, cut a trace and move the resistor over from the bad board. Part number AG-0000016. You must have about 100 ohms between the volt reg output and the connector for the LEDs, or you didn't cut the trace on the board and will burn up the LEDs.
Jon - Thanks for the response. Very helpful. I’ll have to give the LEDs a test. They look OK. The LED dropping resistor is 100 ohms. I talked to Midge at MTH today and ordered a new board. Seems like the same board based on the detailed description she read to me. I’ll check it out before installing although Midge said it had the 100 ohm resister onboard.
