1.Check if the VDD_HUB voltage is normal, if the USB device is turned on, and if OTGID_CTL has a high level, check whether the SGM7227 (U14) and the peripheral connection are normal. Check whether the printer chip power supply has a 3.3V voltage, and whether the crystal oscillator and other peripheral devices are normal. Whether the software is reprogrammed is normal, and the software cannot be programmed to replace the chip.
2.Check whether the printing power supply is normal, whether the contact of the movement socket is good or not, whether the movement of the movement is normal, and whether the roller and the peripheral structure of the printer have foreign matter interference and component damage.
3.The printer cable is not plugged in.
4.The print driver is not programmed.
5.The kernel software is incompatible and reprogramming the kernel.