When I pushed the engine slowly over the switch from the heel of the switch to the thru leg with the switch already in the thru position, I heard a faint buzzing sound that I think was coming through the engine. The faint buzzing sound lasted about 1 second and when the buzzing sound stopped, the light on the switch was very dim. All lights on the switch controller were now off and the switch controller would not activate the switch. The engine did not derail while rolling through the switch.
I tried rolling a car over the switch with power on the switch through both the thru and out routes, but the switch points would not move. The switch points move freely by hand. The light on the switch, which is now dimmer than normal after the failure, dimmed even more when the car was in position where the swich points should have moved.
I disassembled the switch and disconnected the switch motor from the circuit board. I applied DC power to the switch motor and it ran fine. It appears that the circuit board is bad.
Is it possible that the switch tried to power the engine when I pushed it over the switch and the high amps fried the circuit board? Is there anything I can do to either fix the switch or positively verify that the circuit board is bad?
See 1/7/12 post below for solution.
See 1/9/12 post below for Mike Regan's comments via email.
Thanks...
Earl