prompt the handpiece keeping in/out of the handpiece holder all the time on the screen

prompt the handpiece keeping in/out of the handpiece holder all the time on the screen

a) Test whether the handpiece is inserted with the photoelectric sensor in handpiece holder. First, confirm no other sheltering object or luminous body is near to the photoelectric sensor.
​b) After putting headpiece in handpiece holder, check whether the D46 indicator lamp of main control board changes from on to off. If there is no change, check whether wire harness of sensor has poor contact or falls and try to replace the photoelectric sensor. Otherwise, it should be the damage of circuit board. Replace the circuit board at this time.

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