Vintage Synth Repair

Hi Scott - thanks for the suggestion. Mine uses Toshiba tc5517afl   
ICs.  I wasn't able to find the exact data sheet, but I did find one  
for the tc5517cfl. The CFL IC retains data with 2 to 5.5V, so I will  
have to assume that installing a 3v will be suficient.  The old  
battery is still outputting 3.2V, but I suppose I am better off  
changing it while the thing is open.   Thank you again!  Damon T.