3 software failure

    Software can be launched by measuring abnormal switch control signal TXON (T Ⅺ N) to determine the method is to start transmitting circuit or dial " 112" , with an oscilloscope for testing. Standby time is low , the emission can be measured to high pulse control signal. Of course , you can also observe the ammeter method to determine which start transmitting circuit or dial " 112 ", if a regular swing meter , indicating that the soft is running normally, if no swing meter , indicating that the software does not run properly .

    Such failure phenomenon is relatively easy to solve, should overhaul first CPU, such as font and chip repair welding , the failure is still the case, rewrite the software information is generally solve the problem.