Casa CTL-DCM problem, help!

Hi everyone,

So, this is my first post on this forum.

I just received my new CASA CTL-DCM quad laser (RGVY) and my controller Obey 40. Everything is working perfectly except for the green laser.

In fact, i think the horizontal stepper motor (The one that control Y axis) doesn't follow the other 3 lasers.

For example, i choose the static (scanning) horizontal lines on the four lasers. They are pretty much all aligned but the green is not (like 1 or 2 steps over). Then I change the Y axis value. The Red, Violet and Yellow lasers follow up very well, but the green laser go down once, up twice, down, up, up.
So... i guess something is wrong at this point.

Anyone could help me with that problem? The equipment is, or "should be" new, ordered from ebay.

Thanks a lot,

Alex