The GE MD Exciter Control Board DS3800DMEC features 7 terminals for attaching additional components to the board, and 2 indicator LEDs. The GE MD Exciter Control Board DS3800DMEC also is populated with 14 trimmer resistors, 20 jumpers, 1 20-pin ribbon cable, and 1 34-pin ribbon cable.
The 20-pin and 34-pin ribbon cables are not cables that can be disconnected from the board. They are attached to the board and they provide the means through which the board receives signals and power from the drive. When you install the drive, you will find that there is a location designated for the board with a 20-pin and 34-pin connectors adjacent to it. First, use screws to attach the board to the rack, then connect the ribbon cables to the designated connectors. Ribbon cables are fragile and require some special consideration.
When you connect the ribbon cable do not put stress on the cable because there is minimal support given to the cable. If you pull on the connector you can easily pull out the strands of wire that connect the cable and the connector at the end of it. Instead, gently grasp the connector and press it into the connector on the board. Make sure there is plenty of slack in the cable. Also, look for space in the connector on the board. Press down on the ribbon cable connector to ensure that all pins are fully seated. When you remove the board, first disconnect the ribbon cable so that it is not damaged if it is pulled out and damaged.