To prevent foreign matter from entering the ink flow path and causing ink suction and printing problems, never touch the ink port and contacts of the ink tank.
When you press down the ink tank lock lever, the needle enters the ink port, allowing ink to flow between the printer and ink tank.
Do not raise or lower the ink tank lock lever except when replacing the ink tank.
[1] Ink tank
[2] Ink tank lock lever
[3] Contacts
[4] Ink port
1.7.2.3 Handling the Printer
1. Precautions against Static Electricity
Certain clothing may generate static electricity, causing an electrical charge to build up on your body. Such a charge can damage electrical devices or change their
electrical characteristics.
In particular, never touch the printhead contacts.