Be careful when assembling the PlayVideo Interface printed circuit board. All parts except the RF board and the 10-pin header mount on the front of the board. The front has most of the part markings. The RF board and header mount from the rear. Perhaps more subtle is the mounting of the two pushbutton switches. The board has the markings: C  NO  NC  for each switch. The switch fits into the board two ways, but only one orientation will put the COMMON on the left and NORMALLY CLOSED on the right. If you get this backwards, the circuit will think the switch it is being pushed continuously.