1.Don’t make the printer printing receipt longer than 1m, it might damage the printer.

2.Water or other liquid should not be spilled into the printer, also the printer should not be appeared in the rain, or else may cause printer damage.

3.Please do not open the paper case cover when it is printing, otherwise the printer may work improperly. If printer is using USB connection to work, should not unplug the USB cable, or else some printing data may be lost.

4.When printer is using USB connection to work, the distance of communication should be within 10 meters, otherwise the printer doesn’t print or prints rubbish codes. Too high（45℃）or too low（5℃） environment temperature and too high (85％) or too low (20％) environment humidity both effect the printing quality.

5.The printer paper roll with poor quality or stored for too long time also may reduce the printing quality even damage the printer. Under the black mark detecting mode, the printer requires that the pre-printed black mark is accordant with the printing rule of black mark (please refer to details in Chapter 4.2), otherwise the black mark can not be detected correctly.

6.Be sure to use up the power of the battery before charge up it, as it can ensure the using life of the battery.