Epson wide-format inkjet printers are increasingly used in the industrial and textile industries, Epson wide-format printer has many series, such as F series, S series, in fact, the most used to the number F6200 F7200 F9200 Inkjet printer's common ink head structure is mainly inkjet head and ink box one machine and separate two ways. Because the print head normal print homing after the seal is not strict or long time to place, excessive water evaporation, resulting in dry ink in the fine print head tip, so that the ink can not be normal discharge; or different ink mixed with each other, resulting in chemical Response, usually manifested as often disconnected, the color is missing, writing fuzzy or even normal printing and other fault inkjet printer "plug" classification: can be divided into soft plug, hard plug two categories. Repair of hard plugs: 1, soaking method 2, pressure cleaning method