How to print the self-test page of printer?

If your printer suddenly fails to print, you need to provide a self-check page to our engineer for check.

Step:

1.Keep the machine powered on

2.Turn off the power of the printer

3.Long press the feed key and not release

4.Turn on the printer power

5.Release the feed key after 3s

6.Printer will automatically print a self-test page

7.Take a picture of the self-test page and send our engineer.