Click "Detection" on the self-test interface → select "more" in the self-test interface to enter the Android self-test menu interface, select click the upper left corner, select click "Printer" to test;
In the self-test interface click "Hardware detection" → in the self-test interface to select "more", enter the Android end self-test menu interface, select click on the upper left corner to select click "Printer" test;
Click "detection" in the self test interface → select "more" in the self test interface to enter the self test menu interface of Android terminal, and select "print" in the upper left corner to test;<br>