When the printed font is messy, you can lock the nozzle failure and automatically clean the print head first (according to the instructions). If you don't print for a long time, you should clean it several times.
You can also carefully remove the ink cartridge and clean the area near the print head with soft absorbent paper.
If it can't be solved, it may be a driving problem. It's usually good to reinstall it.
The above is my answer, I hope it will help you.