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Alt. Z point for v1, v2, v3 (DUO)?
anyone know? please help
Not sure, but if your tip is fine enough, and cool enough to safely solder to fine pitch pins like those on the controller, I would say that it's safe enough to solder to the listed Z point.
If you're quick about it you won't need to worry.
Actually, now looking at the picture, yes, you could solder Z straight to the appropriate pin on the controller. Look carefully at the diagram, you will find a trace from the Z point to the controller. You definately can solder to the controller chip instead, if you really want to (I would say that's not wise).
Thanks for help!