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What are the measurements at D5 and D6 in-circuit?
I get values both ways in-circuit. Lifted one end of each but the diodes seem good when tested that way. Re-soldered them and get values both directions again. Had to replace R43, and fortunately I had plenty of them in my Newark order.
Tested continuity on both the Volume front panel and the Cutoff front panel. There does not seem to be any issue there.
Finally gone round to removing that CPU socket after verifying that I did get a new 40-pin socket (of which I don't like the build and the pins too much, but it will have to do). Also had to get a new Weller soldering iron as my previous one's tip was damaged. The little bits of solder stuck in the vias are very annoying. I still have about 10 vias I need to clean more before I can envision putting in the new socket and re-testing continuity for the CPU, before mounting everything in the Polysix again.
Yash