Digital multimeter repair method
1. The sensory method involves using the senses to directly identify the cause of a fault. Through visual inspection, you can detect issues such as broken wires, desoldering, short circuits, blown fuses, burned components, mechanical damage, and broken copper traces on printed circuit boards. You can also touch components like batteries, resistors, transistors, and integrated circuits to check for abnormal temperature rises. By referring to the circuit diagram, you can determine the root cause of these temperature anomalies. Additionally, you can check if components are loose, if integrated circuit pins are properly seated, or if switches are jammed. Listening and smelling can also help identify problems, such as unusual sounds or burning odors.
2. The voltage measurement method is used to check whether the operating voltage at key points in the circuit is normal, allowing for quicker identification of the fault. For example, you can measure the operating voltage and reference voltage of an A/D converter to determine if they are within expected ranges.
3. The short-circuit method is commonly used during the inspection of A/D converters. This technique is especially useful when repairing low-current or micro-electronic devices, as it helps isolate faulty sections by temporarily creating a short circuit.
4. The open-circuit method involves disconnecting a suspected section of the circuit from the rest of the system or unit. If the fault disappears after this disconnection, it indicates that the problem lies within the disconnected part. This method is most effective when dealing with shorted circuits.
5. The component measurement method is applied when the fault has been narrowed down to specific components. These components can be tested either online or offline. If necessary, they can be replaced with known good ones. If the fault is resolved after replacement, it confirms that the original component was defective.
6. The interference method uses the voltage induced by the human body as a test signal to observe changes in the liquid crystal display (LCD). This method is often used to check the integrity of the input circuit and the display section, helping to identify potential issues in those areas.
By combining these methods, technicians can systematically diagnose and resolve electrical and electronic faults more efficiently. Each technique has its own advantages and is best suited for specific types of problems, making a well-rounded approach essential for accurate troubleshooting.
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