The auto chunking of the RDC6442S doesn't work

1.Problem description:RDC6442S,when the graph is over format,select automatic partition,and the laser is first crosscut along the X-axis direction.When there is no light,the U axis starts feeding,reaches a certain length and then cuts the light,then stops.(Auto partitioning doesn’t work)
2.Possible cause analysis of failure:The laser head stays in the wrong position during operation.
3.Solution:The laser head must stop at the bottom of the Y axis.(Near the end of the operator)