Electronics > Repair
BK Precision 2120 trace issues
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vexatag:
Order of the screenshots: Slope switch pins (two images), U601 pin 9, U603 pins 3, 5, and 6.
bdunham7:
I don't know why you don't have a signal at U601 pin 9, but have it at U603, pin 3.  That seems strange.

Nonetheless, the problem appears to be that U603 isn't switching, even though it has an input that should switch it.  I'm probably not going to be able to think about this for a day or two, but in the meantime, you can try scoping every pin of U603 and posting all the screenshots.  I think you are getting close to the problem area.
vexatag:
Sorry this took a few days, I just got a vr headset so that's been using a lot of my time. Here's the screenshots of U603's pins, I hope a zip file isn't too suspicious for you.
bdunham7:
I may have forgotten about you!  Where were we on this? 
vexatag:
We were looking at U601 and U603, I scoped every pin of U603 and put the screenshots in a zip folder
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