Follow the procedure below:
Ensure a card is present in the printer.
Press the pushbutton for four to five seconds until it turns off.
Press and hold down the pushbutton again. The indicator light on the pushbutton comes on.
Release the pushbutton once the indicator light flashes.
The test card is printed.
The printed card is ejected into the output hopper. To remove it, open the door of the output hopper.
The printer is ready for two-sided printing.