The problem with the ink cartridge is that the toner is less and unevenly distributed, resulting in a dark and irregular copy background. You can take the ink cartridge apart and have a look. If it is missing, remember to add it in time. If you have other problems, you'd better find a master to solve them, don't touch them yourself, and don't trust people who charge for maintenance easily.

Principle: Send printing instructions to the printer. At present, it is sent to the computer through the network, and the printer connected to the computer prints.