Power check, after finding the feed motor in place all the time. Bald head constantly switch is the most common causes of poor, after looking up the switch contact is good. The servo circuit and decoding circuitry is integrated on a circuit board, first measuring +5V, +12V voltage are normal, troubleshooting, should be in servo circuit. Logging BA6392 +3V voltage at work 1, 2 feet, normal, but once this voltage does not disappear. Measuring 4 foot control voltage is very low, look up CXD3008 26 foot along the line, when bald touch switch, the PIN voltage is around 1V, obviously CXD3008 did not receive signal, doesn't make sense given brake instructions to the driver circuit BA6392. Check L16 is open circuit, replace it after troubleshooting.