Recently, I repaired a 2P Chigo air conditioner. I initially didn’t want to post about it, but there are likely many colleagues in the forum who also use old board components for repairing faulty machines. However, this was my first encounter with a situation where the disassembled board components were also defective, so I wanted … Read more
Electrical Engineering Learning Network: www.dgdqw.com Follow the official WeChat account of the Electrical Engineering Learning Network “Electrical Engineering and Electronics” to gain more experience and knowledge. The multimeter is the primary troubleshooting tool for electricians. Once accustomed to it, even when a fault occurs that could be diagnosed without a multimeter, one may feel uneasy … Read more
Hello everyone, I am Engineer Zhang. Today, I will explain a very important topic in industrial automation – the communication applications of the PNOZ safety relay module. In industrial settings, the safety of personnel and equipment is always the top priority, and PNOZ is a key device specifically designed to ensure this safety. Basic Concepts … Read more
Today, I would like to share the Profibus PA bus technology that is frequently used in the field of chemical automation. This is based on my experience during a DCS renovation project at a chemical plant, and I believe it will be helpful for those engaged in process automation. What is Profibus PA To understand … Read more
What is a multimeter? A multimeter, also known as a multi-tester, volt/ohm meter, is a versatile measuring instrument that can be classified into analog and digital types. It is a multifunctional, multi-range measuring device that can generally measure DC current, DC voltage, AC current, AC voltage, resistance, and audio levels. Some models can also measure … Read more
The circuit board of a water purifier is the core component responsible for controlling the entire system’s operation, including water quality filtration, purification, and display functions. If the circuit board malfunctions, it may cause the water purifier to operate improperly, leading to frequent starts and stops. 1. Functions and Components of the Water Purifier Circuit … Read more
1. Observation Method When we receive a circuit board for repair, the first step is to carefully observe its appearance. If the circuit board has been burned, it is crucial to check whether the power circuit is functioning correctly before powering it up, ensuring that no further damage will occur. The observation method is a … Read more
1. Characteristics and Repair of Capacitor Failures in Industrial Control Circuit Boards Failures caused by capacitor damage are the most common in electronic devices, especially with electrolytic capacitors being the most prevalent. Capacitor damage manifests as: Reduced capacity; Complete loss of capacity; Leakage; Short circuit. Since capacitors serve different functions in circuits, the characteristics of … Read more
Troubleshooting Inverter Circuit Boards Generally speaking, the printed circuit boards on an inverter mainly include the drive board, main control board, and display board. The factors affecting the lifespan of the inverter’s printed circuit boards include the lifespan characteristics of the smoothing capacitors in the power supply section and the buffer capacitors in the IPM … Read more
A multimeter is an essential measuring instrument in electrical and electronic departments. As temperatures gradually drop and rainy, humid weather increases, the number of reports regarding electrical leakage faults has also risen. I believe many friends have been thinking hard about finding the cause of electrical leakage. In fact, we can easily find the cause … Read more