Scenario 164: Service Fails to Start Issue: Apache web server fails to start. Troubleshooting Steps: Check the status of the Apache service: systemctl status httpd View the Apache error log for details: journalctl -xe | grep httpd Fix any errors in the configuration file and restart the service. Scenario 165: Service Crashes Issue: MySQL database … Read more
Common Causes and Solutions for PLC Failures During OperationPART1.Peripheral Circuit Component Failures Such failures often occur after the PLC has been in operation for a certain period. If a component failure occurs in the PLC control circuit, the PLC control system will immediately stop working automatically. The input circuit is the port through which the … Read more
Comprehensive Analysis of Linux Command Line Help Tools Proficient use of help tools in Linux systems is key to enhancing operational efficiency. This article systematically reviews mainstream methods for viewing command help and provides usage suggestions based on practical scenarios. 1. Built-in Help Tools –help or -h option is suitable for quickly obtaining a brief … Read more
Click the blue text to follow us When the disk space is full, it can lead to application anomalies. How should we troubleshoot the issue of full disk space? First, we need to confirm the disk space usage. To check the disk space usage, we can use the df command. [root@VM-181-124 ~]# df -h Filesystem … Read more
Packet loss refers to the situation where data packets are discarded during the transmission process due to various reasons before they reach the application program. The number of discarded packets divided by the total number of transmitted packets is what we commonly refer to as the packet loss rate. The packet loss rate is one … Read more
I. Precision Diagnosis to Tackle Industry Pain Points In industrial equipment and smart terminal applications, sudden white-screen issues in LCD displays have long been a persistent headache for engineers. As a leading character LCD manufacturer in China, CNK Electronics combines 18 years of expertise in China LCD display technology to innovate the Three-Step Intelligent Troubleshooting … Read more
Click the above to follow Hat Computer for free answers to various computer knowledge.At the beginning of today’s article, I want to explain briefly, as many of my wealthy fans have commented that there are some typos. All my articles are purely hand-typed original content. Sometimes late at night, while typing articles, I can’t help … Read more
1.1 Basic Recognition Mnemonics A circuit board can change in countless ways; the combination of components is key. Resistors and capacitors are the most common; understanding their symbols is essential. Resistance changes and capacitor leakage; remember the basic characteristics. Inductance and voltage changes can be checked; measure the PN junction of transistors. MOSFETs can be … Read more
Click ↑ for automotive repair cases and follow for updates to obtain the complete timing guide Highly versatile, applicable to all circuit boards! 1. How to repair circuit boards without schematics? 1. You must have a clear mental image. You need to thoroughly understand the principles of some typical circuits and be very familiar with … Read more
