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The Range of The Normal Z Offset Calibration Value on Samsung SM321

Head1~ Head6: 77.5 ~ 80.5 mm
If the Z-offset exceeds this range, it means that the head has a serious mechanism problem. Therefore, check if the home position and the operation of spindle, LM and Z-motor are normal.
This calibration is performed to set the height of the Z-axis to ‘0’ for each head from the top surface (reference surface) of the PCB.

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