Problem with ScannerMax C-506

Image with ScannerMax C-506.
In height (Y) all correct, but in width (X) very narrow.

I have checked connections and I do not see anything strange.
I send you the picture in case you can help.







It is normal to have current continuity between GROUND (X), GROUND (Y), GROUND Stanwax board, aluminum base (where power supplies, galvanometer and amplifiers are screwed) and GND house (240v)???

Can this be the problem of narrow image in channel X?





Have a happy weekend!

Best Regards.
Juanma.