A
Possible reasons: The data links are not tight; the ink supply system is not smooth; the printheads been clogged; the main board and the printhead board cannot use at the same time; the main board has been broken already.
Solutions: Re-contact the data link (Note: can’t pull out the data link with power, otherwise the printheads are easy destroyed); check all of the parts and the connector of the ink supply system; can’t let the air enter; clean the printheads or change the printheads; use the shared main board, I/O board, and printhead board; change the printhead board.