1. Voltage detection and disconnection method.

2. Voltage detection method: used to detect the voltage of each key point in the circuit to judge the fault point.

3. Disconnection method: when there is a short circuit or excessive current in the circuit, this method is used to reduce the fault range.

4. Resistance detection method: used to judge the quality of a certain part of the circuit.

5. Current detection method: judge the fault by observing the current value.

6. Observation method: preliminarily check whether the circuit is damaged by burning, explosion and other irresistible factors.

7. Experience method: the monitoring project judges the fault point according to previous experience.

8. Substitution method: for components that cannot be determined whether they are damaged, the substitution method is used to verify whether the suspected components are damaged.

9. Adjustment method: when a certain value of the product deviates from the normal product, it can be adjusted through potentiometer or other settings until the effect is satisfactory.

10. Induction method: when the monitoring project has no output or the output is unstable, add an interference signal at the output end to accurately judge the fault of a component in a certain part.

11. Temperature method: when a fault occurs after a period of time, the heating method can be used to eliminate the fault.

12. Touch method: open the casing and touch whether each element (chip) is overheated or exceeds the normal temperature by hand, that is, the hand cannot stay on the element, and it will feel abnormal geothermal, so as to judge the fault point.