Should the high-voltage electroscope be inspected and repaired if it fails?

   1. Press the test button on the high-voltage electroscope to press the ceramic sheet and the light-emitting diode without alarm.According to the fault phenomenon, it is judged that it is a pre-inductive flat rubber-sheathed flexible cable. The source trigger control circuits Q1, R1, R2, and R3 should be detected for damage. The above components are checked with a multimeter, and they are all normal. Then check the peripheral components of HD14011BP. No problem was found, and it was judged that HD14011BP is damaged.After trying a CD4011 four-2 input and non-gate substitution, troubleshooting.

   2. Press the test button on the high-voltage electroscope, the alarm is normal, but the audio alarm does not sound when the electroscope is used to test the electricity.Press the test button on the high-voltage electroscope, the piezoelectric ceramic sheet and the slide line indicator light-emitting diode alarm are normal, indicating that the internal circuit and drive circuit of HD14011BP, the piezoelectric ceramic sheet and the light-emitting diode are normal, and the fault is triggered by the pre-induction detection source control circuit. Check Q1, R1, and R2 with a multimeter and find that the resistance of R2 has become large. 4MW, replace a 1MW resistor, troubleshooting.

   3. Press the test button on the high-voltage electroscope to indicate that the high-voltage megaohmmeter alarm sound is very small.Use a voltmeter to measure the ground voltage of the HD14011BP pin to 9V normally.The inspection of the peripheral components of HD14011BP is normal. After the inspection of the transistor Q2, its performance is found to be **. Replace a C9014 and troubleshooting.

   4. Press the watch-type proximity alarm on the high-voltage electroscope and test the button. The intermittent flashing light emitted by the light-emitting diode is normal, and the alarm sound emitted by the non-piezoelectric ceramic sheet is checked. Q3, R10, R11, and L are all normal.The connection line between the piezoelectric ceramic sheet and the circuit board is good. Replace the piezoelectric ceramic sheet and troubleshooting.The high-voltage electroscope, the slip line varistor, must be checked regularly.Take it lightly when using it, and do not shake or vibrate violently.

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