Water or other liquid should not spill into the printer, also the
printer should not be appeared in the rain, or else may cause
printer damage.
Please do not open the paper case cover when it is printing,
otherwise the printer may work improperly.
If print with serial interface, should not unplug the interface
cable in the course of printing, or else some printing data may
be lost.
When print in Ir or IrDA mode, be sure the Ir window of the
host equipment face rightly the Ir window of the printer, the
distance should be within the range of 50mm, and the angle
should be within the range of 30o.
When print with Bluetooth interface, the communication
distance should be within 10 meters, otherwise the printer
doesn‟t print or prints rubbish codes.
Too high（45℃）or too low（5℃） temperature and too high
(85％)or too low (20％) relative humidity both effect the print
quality.
The print paper in poor quality or stored for too long time also
may reduce the print quality even damage the printer.
In the black mark detecting mode, the printer requires that
the ready-print black mark is accordant with the black mark
printing rules (details please refer to Chapter 5), otherwise
the black mark can not be detected correctly.
