Jim, take a look at the MITA web page at

    http://www.MitaTechs.com/index.html

They have links to companies that sell the shop manuals and parts
for most electric organs.  The particular link for Conn is

    http://www.MitaTechs.com/serownman.html#CO

Good luck on your project and let us know how it goes.  I am thinking
of adding a MIDI controller to my Wurlitzer 950.

Mickey Sadler, Dublin, Ohio
<msadler@netset.com>