The 7600D was a fine radio. I enjoyed the ICF-2001 version for several
years because it was so easy to use and did a decent job of pulling in
stations. the keyboard on mine finally started to give out.

Unfortunately even if you replace the CPU or whatever is wrong you will
still have 17 year old switches, display, etc. The new 7600 is several
steps better in terms of memories, sync detection ssb reception, etc.
And it's probably a bit quieter too (mine had a moderate level of
internal hiss). I would spend the $130.00 for the new one rather than
fix the venerable 7600D.