If the workbed keeps rising,

1. Access the diagnostic interface from the control panel (as shown in the figure),
2. Manually activate the laser head's autofocus sensor by pushing up the laser head.
3. Check whether the corresponding interface on the panel is responsive. For models with KT332 board, the box before "LmtU-" will be filled with green if the sensor is working; for models with RD6442 board, the box will be filled with red.

If it is, check the auto-focus sensor wiring or replace the auto-focus sensor.

If it is not,

1. In RDWorks, access "Vendor param".
2. Adjust the Z (or U) axis "home offset" (as shown).

If the workbed keeps lowering, check the auto-focus sensor wiring or replace the auto-focus sensor.

 If the panel displays "autofocus disabled",

• In RDWorks, access user parameters.
• Enable "autofocus" (as shown).

If the workbed lowers to a wrong focal length during autofocusing,

• In RDWorks, access user parameters.
• Adjust the value of the Z(or U) axis "home offset" (as shown before).