Kudos to Tony K. for finding an error in the schematic for my UEG mod. The updated schematic is now up: http://www.tellun.com/motm/mods/ueg/ueg.html The mod didn't change, R11 (on the UEG motherboard) was merely shown on the wrong side of the diode.
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UEG mod update
2003-04-16 by Scott Juskiw