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9.5.3 Unexpected Failure
Following abnormal conditions indicate unexpected failure of the instrument,
please turn off power supply, take battery out if necessary, send it to assigned
service place for maintenance.
(1) Instrument has obvious mechanical damage (for example serious extrusion or
collision in transportation);
(2) Instrument keyboard or screen display abnormal;
(3) Storage in high temperature, high-moisture or corrosive environment for long
time.