Put an identification label on each cable that is attached to the PCB. This makes the installation easier. Disconnect these cables.
Remove the PCB board by removing the (2) standoff bolts from the DB25 cable labeled CONTROL CBL 1 .
Install the replacement PCB board and hand tighten the standoff bolts.
Connect all cables to replacement PCB.
 AMP SIG X
 AMP SIG Y
 AMP SIG Z
 12V RELAY
 DOOR SW
 INVTR SIG
 X HOME SW
 Y HOME SW
 Z HOME SW
Caution: Carefully compare the two PCBs to make sure you install each cable in the correct position. If you do not correctly install each of the cables, the PCB cannot operate correctly.