1. The printer is sensitive to static electricity. If there is static electricity in the body of the printer, the equipment should be grounded effectively. 2. When operating the circuit or the nozzle, the total power of the printer must be disconnected first. 3. Each pipe connection of the ink supply system must be guaranteed to be free of leakage. Check whether the ink supply condition of the ink cartridge is normal, ensure that there is no air leakage at the ink supply tube interface of the nozzle, and there is no air bubble in the ink supply tube, otherwise there will be insufficient ink supply. 4. If the ink is found to be slow, the filter must be checked or replaced. 5, the nozzle on the inkjet printer should be supplied with ink before powering on, because the ink is the main way to take away the heat of the nozzle. 6. The ink flow between the nozzle and the sub-tank is realized by the principle of physical siphon, so there must be a strict height difference between the two. Specifically, the nozzle surface is higher than the liquid level of the sub-tank. ~ 5 centimeters. 7. The internal circuit system of the printer is strictly structured. If there is no professional technical ability, it is best not to dismantle it. 8. When cleaning the nozzle with the manual air pump, after lifting the air pump button, press the button slowly, and press the button without pressing the force.