The reason for ink leakage is the high pressure in the ink cartridge and continuous supply. For example, newly added ink will generate bubbles, causing pressure. The solution is to open the rubber plug of the ink cartridge, suck air with a syringe, stop after sucking the ink, and plug the rubber plug. The reason for the collapse is the problem of sensor and grating belt. Check whether the grating strips are clean, and wipe off the ink or black spots with alcohol. Sensors should also be clean. Different machines are in different positions. Find it yourself.