They tell you that you should test the y-axis limit sensor, however, if you check the parts list, it’s not even listed there. There is no clear indication as to where it’s located, how to test it, trigger it, get and read output from triggering it, nothing. All I know is this issue apparently could be due to a bad limit sensor and I’ve gone through this machine after replacing the bed and found that the bed ground cable to the PCB in the back was not just “loose” but loose to the point you could call it barely hanging in there. A flaky ground in a system can cause all sorts of gremlins and this is disgusting. Has anyone else had to deal with this or know where the sensor is and how to work with it to diagnose issues?
Thanks a lot in advance.
I was having a similar issue till a few days ago, and reading the same unhelpful notes on the limit sensor. But eventually I noticed that the head was centering on the print bed after startup, and I recalled that it previously homed on the right hand side. I don’t know exactly which stage fixed it, but I
- Powered down and moved the head to front right
- Restarted and did the build volume detection from settings
- Restarted and again moved the head to the front right
- Ran a print with calibration
and it seems to have been OK since. I feel the new firmware may be missing a step that was previously moving the head out to the right, but I don’t want to try to replicate the error as I destroyed a couple of build plates when it dragged the head in from the left.