Hi,
No way of turning off the sensors that I can see.
Having googled grub screws ... no idea as I can't see any even using a magnifying glass. It then I don't have a grub screwdriver either.
Have been playing around. If I move the needle manually by using the wheel it goes up and down. If I use the electronics to see a pattern the needle doesn't move, it does the first stitch then stays at its highest position.
Crying doesn't seem to help.