To begin exploring the DMX-lator II,
you need to get inside. If you've already removed the cover,
you've seen the back side of the PC board... not too informative.
The board is held in by the XLR connectors. First remove the
flat-head screws that hold the connector to the cabinet. Then, if
you look into the end of the XLR connectors, you'll see an extra hole
that doesn't correspond to any of the pins of the mating
connector. At the bottom of the hole is a quarter-turn
fastener. Use a jeweler's screwdriver to turn it
counter-clockwise. This allows you to remove the collar of the
connector. After you've removed the collar from all three
connectors, the board comes out easily.