Small character inkjet printer 550 series inkjet printer uses a number of high-tech applications and has applied for more than ten patents. Modular and simple design, the ink system and print head are integrated, which makes the inkjet printer run more stable and intelligent automatic alarm system. The intelligent alarm system adopted by the F550 small character inkjet printer has made the greatest improvement on the basis of the original A400. The fault alarm is more accurate, allowing users to understand the operating status of the printer more intuitively, and the operation is more convenient. The fully sealed ink supply system prevents the ink and solvent from directly contacting the external air during the entire pipeline circulation process, that is, avoids unnecessary volatilization of the ink solvent, saves the cost of consumables, and reduces the pollution of consumables to the air. It is more conducive to environmental protection. The circuit adopts a high-integration, low-power design, especially a single-circuit motherboard, single-output power supply design, and multiple protection circuits are added to greatly improve circuit reliability. In addition, the circuit system is completely enclosed, internal circulation heat dissipation, comprehensive waterproof and dustproof, and more effectively reduces the failure rate of the circuit system. The automatic cleaning function can be said to be the focus of attention of many corporate users. In the small character inkjet printers of other brands, customers often hear feedback that the automatic cleaning function of the inkjet printer is not complete, and the maintenance of the inkjet printer is too cumbersome. For F550, the system will automatically spray solvent to clean the nozzle and recovery pipeline during the power-on process to ensure that the nozzle and ink pipeline are unimpeded and improve the stability of equipment operation. The nozzle is the guarantee for the stable operation of the small character inkjet printer. Common small character inkjet printers are generally made of stainless steel. There are many burrs during the use of this nozzle, which will affect the printing quality of the inkjet printer. F550 inkjet printer The ruby u200bu200bnozzle with excellent workmanship is used. The ruby u200bu200bnozzle generally has a higher finish, which can ensure the high-quality printing quality of the inkjet printer.