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I rechecked pin to pin continuity with one probe on F5 and the other probe on the corresponding pin of F12. Went through all pins on both sides of the RAM and then repeated for row G. All pins checked out good with the exception of Pin 3 on one side and pin 2 on the other side of the RAM chip...

I am the original owner of a 128k Mac from my first year at Drexel University in 1985. I am trying to restore it back to operating condition. When I powered it up I got the Chime and then the Sad Mac Icon with code 040820 was displayed with a good quality screen picture. So I replaced RAM chips...