The GE Analog I/O Terminal Board DS200TBCAG1A features 2 blocks of 90 signal wire terminals and 2 50-pin connectors. One 50-pin connector is labeled JDD and the other is labeled JCC. 50-pin connectors are attached to ribbon-type cables that require some special consideration before you connect or disconnect them to prevent damage to the ribbon cable. To disconnect a ribbon cable do not touch the ribbon portion of the cable. Hold the connector portion and remove it from the connector on the board. Use your other hand to support the board and keep the board from moving or bending under the pressure. Each signal is made up of a fews strands of copper wire that might be inadvertently disconnected from the connector. That would prevent the board from receiving the signal for processing. Or, prevent the board from transmitting the signal.
There are potentially multiple signal wires connected to the terminals and so it is best practice to designate where to connect each signal wire by labeling each wire with the ID of the terminal before you disconnect it. With as many as 180 signal wires it is important to eliminate the opportunity for error that would increase the downtime for the drive.
Because of the weight of the drive, and the large number of signal cables, the drive is connected to the board rack with 4 screws. Make sure you use all 4 screws to support the weight of the board and prevent the board from moving inside the drive.