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Old 28th September 2017
  #10
Gear Maniac
 

Since I wrote the initial breakdown, I've acquired 2 more of these. I took one apart tonight, and started working to reverse-engineer the schematic, for my own fun. This one is a lot cleaner on the inside, and is one of the later versions with the resistor arrays and barrel power connector.. The 2 chips marked #17 are 4X4 crosspoint switches, probably there to deal with the MIDI processors in some fashion.

One modification done to this unit is that the battery was removed, and 2 AAA batteries glued to the front panel with silicone caulk, then wires soldered appropriately. I think I'll be removing all that and putting in a standard CR2032 holder and battery.