Estimated abnormal parts:
- PB control board (PBCB)
- Control program
- Deactivate the sub-power switch and unplug the power plug. Restart the main body after 10 seconds.
- Check the connector connection of the control board and the drive board in PB, and repair it when there is any abnormality.
- Rewrite the firmware of PB.
- Replace PBCB.
