Above, you can see the main board close-up. The fuzzy terminal block on the left is where the main board receives power and ground from the I/O board. (At this point I still didn’t have an I/O board, so I had to improvise a supply.) The ground signal is then split off and connected to the sensor panels.
The terminal block has connections for 9V and ground – which is strange, because it turns out that the entire unit is powered off 12V. More on that later.
To my surprise, after powering the board, the board came to life.
The small, blinking light in the center of the main board responded when I moved controls, so that was promising, but the LEDs were only working on the left side.
In the next post, I’ll discuss how I tested the MIDI functionality.