Canon BJC-250 - Manual (Page 55)

Printing the Test Pages Using the Operator Panel
To print a test page, make sure the printer is turned off and paper is loaded.
Press and hold the POWER button until you hear the number of beeps that
correspond to the test page you want to print.
Number of beeps Test page
1 Demonstration
2 Status Information
3 Test A
4 Nozzle Test
When you release the POWER button, the test page starts to print.