Laser engraving off center of substrate

I seem to remember this question being asked before so forgive me for another

My Omtech 60W, Ruida 6224B/C, is engraving the substrate fine except it is off-center by about 2mm on the “X” axis. Is that an indication of slack in the belt? Instructions are a little vague when determining how tight the belts should be. Any help greatly appreciated.

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