1. Observation method

2. Knocking hand pressure method

The so-called "knocking" refers to gently tapping the plug-in board or component with a small rubber hammer or other knocking object to see if it will cause an error or shutdown fault at the location where the fault may occur.

The so-called "hand pressing" refers to when a malfunction occurs, turning off the power and re pressing the inserted components, plugs, and seats firmly with hands, and then turning on the machine to see if it will eliminate the malfunction. If it is found that knocking the casing is normal, but knocking it again is not normal, it is best to reinsert all the connectors first and try again. If the problem is not successful, we have to find another way.

3. Exclusion method

The so-called troubleshooting method is to determine the cause of a malfunction by plugging and unplugging some plug-in boards and devices inside the machine. When a certain plug-in board or device is unplugged and the instrument returns to normal, it indicates where the fault occurred.

4. Substitution method

5. Comparative method

6. Ascending and descending temperature method

Sometimes the instrument works for a long time, or when the working environment temperature is high in summer, it will malfunction. The shutdown check is normal, and after stopping for a period of time, the power on is normal again. After a while, the malfunction will occur again. This phenomenon is caused by the poor performance of individual ICs or components, and the inability of high-temperature characteristic parameters to meet the indicator requirements. To identify the cause of the malfunction, the temperature rise and fall method can be used.

7. Shoulder riding technique

8. Capacitance bypass method

9. State adjustment method

10. Isolation method