COMGROW COMGO Z1 LaserGRBL Beginner's Manual page 17

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Troubleshooting
2：When grayscale engraving and the zero return engraving is used as the starting point, the X-axis
keeps hitting the edge of the product after a period of normal engraving
Solutions:
1：Please check whether the setting size of the engraving image is more than
400*400；
2:： Enter $$ and check whether it is $20=1. If not, then modify $20=1 to start
the soft limit switch, which can prevent the carving range from exceeding
400 when set by human or other abnormal conditions；
3：If the machine does not move during the engraving process；
Solutions:
1：Please check whether GRBL is connected to the machine；
2：Please check whether the product power supply has power supply, check the red indicator；
3：If there are no problem with the above operations, please check whether there is a red alarm in the
lower right corner of GRBL software. If so, it means the gyro alarm has been triggered, please enter $$ value
to check $140 value. It is recommended to set it to 16 after clicking the start button to lift the alarm.
4：If none of the above operations reveal a problem, check whether the progress meter triggers a soft limit.
If so, please click the reset button, the unlock button and click start engraving.
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