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3. Buttons, indicator lights and functions
3.1 Paper feed button
（
）
Under the condition that the printer does not alarm, press this key to deliver paper, and press this key
continuously to deliver paper continuously.
3.2 Power indicator light
（
）
The color of the indicator light is blue. That the light is on indicates that the printer is powered on, while that
the light is off indicates that the printer is powered off.
3.3 Error indicator light
（
）
The color of the indicator light is red. When the printer is out of paper, or there is something wrong with the
cutter, or the print head is overheated, or there are other errors, the light flashes.
3.4 Paper shortage indicator light
（
）
The color of the indicator light is red. The light and the error light are on at the same time, indicating that the
printer is short of paper. The light and the error light are off at the same time, indicating that the printer has
paper.
3.5 Description of printer state
Error state
Including print head overheating, cover opening, lack of paper, cutter block and paper block, etc.
Standby state
Printer has no errors without printing or paper feed to wait for printing task.
Print state
The process from starting to print to the moment when the contents to be printed are printed after the print
contents are received completely.
Paper delivery state
The process from paper delivery to paper cutting before the printing is completed.
