According to the partlist A4U1 and A4U2 seems to be TL072CP opamps.
jim77...@gmail.com said:
I have gone through the troubleshooting process from the manual and it seems
to point to A4U2 (Schmidt trigger) being faulty.
I'd put a scope on it to check.
Before I dive into this, does anyone have any advice? Most important being
the Schmidt trigger - where do I get one?
You need more info - the manufacturer's part number or something like that.
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