Krell FPB600 balanced / unbalanced change


To change the balanced to unbalanced position in Krell FPB 600 a pair of pins are to be inserted in the balanced slot. there are 1 2 3 positions . To which configuration are these pins to be inserted?
Thanks
fpooyandeh
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3 and 1. Pin 2 is hot.
Take a look at this image:

http://www.enjoythemusic.com/superioraudio/equipment/0210/pass_labs_XA305.htm