Fault and treatment of automatic image measuring instrument

When using the optical imager, it is found that the elements do not follow. What should I do at this time?

There is no grating ruler in the second dimension measuring instrument. Why is there no data display?

How to deal with the white screen if the image measuring instrument has no image display?

Image measuring instrument, automatic two-dimensional no image display, blue screen how to do? What are the treatment methods?