Open the front cover-Clear/Return-Start arrow 1 1 time-Confirm

Clean it up.

The main reason is that you didn't clear the data in the printer. The printer defaults to the paper you typed in front of you, resulting in a small amount of toner!

First, restart the computer and printer to see if the yellow exclamation point disappears.

Second, open the device manager to see if the printer is installed correctly.

Third, if the above two methods are useless, reinstall the printer driver.