I couldn't make heads or tails of the pinout on the schematic linked in the previous reply. I found schematics for the 1.8 amp power supply in the LisaList groups in Google Groups (groups.google.com) here:

http://groups.google.com/group/lisalist/browse_thread/thread/6d5b0b45fe69179/ab9000f1fc21a061?lnk=gst&q=power+supply+schematic#ab9000f1fc21a061

The 1.8 amp power supply schematic has a very good pinout description. Seems to me that since the 1.8 amp and 1.2 amp power supply work in the same systems,

the pinout ought to be the same for both. Hope this helps.