Correction of pin numbers from preceeding post
: Okay, I just repaired my third one and this time it was the 7660 IC chip. I tried the caps first and that didn't do it so I bought a 7660 from Digikey.com for less than a dollar and put that in. Now this one is working too. I found that testing the voltage on the chip before repairing had the same symptom (no -5v between pin 3&5) regardless of a bad capacitor or bad IC7660.
: I only know for sure that the end 10mF cap is the charge cap but the next two 47mF caps may be part of this charge circuit as well. Any way you look at it, it costs less than $5 to change out the caps and IC. Hope this helps.