[sdiy] Broken Electroharmonix Drum Machine

[Grant Richter]

Hello All,

My friend Gabe picked up a broken Electroharmonix DRM-32 drum machine pedal.
I always liked them because Cabaret Voltaire used one on "Discover America"
(or the DRM-15 or DRM-16).

It basically clocks, the bass drum sort of works, that's all. All power
supply voltages are present and stable.

The EPROM is a 2758, can't find a datasheet on line. Is this a 5 volt
variant of the 2708?

There is extensive hand wiring on the PCB board. Looks like it was done at
the factory, but I can't be sure.

A full schematic is probably too much to ask for. Any suggestions?