HD Series
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1. Hold the position of the printer paper bin cover with your
fingers and open the cover up;
2. Put the printing paper into the paper bin according to the
diagram. Pay attention to the direction of the paper. If the
installation is reversed, the printing will be blank;
3. Just close the paper bin cover.
3) Printer self-test function
1. When the machine is turned on, press the printer test key
briefly, and the printer will automatically print out a piece of
blank paper.
2. In the case of power on, long press the printer test key for
three seconds, the printer will automatically print a section
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