I recently bought a pair of PM-218's on Ebay - no manuals, no power supplies. Based on a decal on the underside of the lid, I built power supplies and managed to get six greens leds at power up. Both consoles are fully functional (and really good devices) except that the 8-input mult board is inoperative on both consoles.
I suspect that I am missing something with the power supply. I'm looking for information from someone with a PM-218 or PM-228 who might be familiar with this board.
Autogram seems inert and has been unable to help.