This tutorial applies to scenarios:

A. Already adjusted the belt, eccentric nut, etc., but still appear obvious carving distortion situation.

B. Moving the module (x or y direction), there is obvious resistance or friction sharp sound.

Requires the user to prepare the hexagon socket head cap screws in the tool box

check place:

Y-axis: synchronous wheel connection at both ends

X-axis: tensioner mounting connection

Check the steps：

X-axis：

1. Remove the screws of laser engraver at both ends of the front assembly as shown. 

2. Remove the front assembly, taking care that the main board cable connection is connected to the Y-axis motor cable connection and not ripped.

3. Apply screws to unscrew the tensioner screws and leave the belt at slack.

4. Unscrew the coupling.

5. Go back to the front view of the Y-axis and unscrew the screws in the red frame.

6. Get the synchronizer wheel, check the tightness of the screws, tighten them with a screwdriver and reinstall them.

7. Check the right synchronizer wheel in the same way.