WPC 95 driver board
Question: I have installed a new PinLED WPC 95 driver board in my pinball machine. After switching on, the row of lamps 1 lights up continuously. The row driver T9 is short-circuited.
Answer: The three plugs J124, J125 and J126 are very close to the lower right fastening screw. The first contact of connector J126 is short-circuited to ground by the mounting bracket underneath.
A plastic washer is included with the circuit board. This is placed between the circuit board and the mounting bracket and ensures that there is enough space to prevent a short circuit.