The mainboard "number" display meaning when machine startup initialization:
R：The print head board and the motherboard are establishing fiber-optic communication or
fiber-optic plug-in error reporting.
0：Normal operation status
1：Initialization status：Seconds beating but the digital tube has a display
2：Initialization status：Z-Axis rising
3：Initialization status：X-axis right motion and Y-axis rear motion
4：Initialization status：X-axis left motion and Y-axis forward motion
5：Initialization status：Z-axis dropping
6：Ink shortage
7：Need to rewrite firmware program
8：Need to rewrite firmware program
9：Safety bottle is full（The bottle should always be empty when the system is operating
normally; once the bottle is full, the system will stop supplying ink).
DOT：The decimal point flashes, indicating that the firmware is running normally.