🔥 “It’s so annoying! Can’t even connect the Bluetooth in the Modern Tucson, you’re so outdated!” ❗ In this rapidly advancing technological era, the smart features in cars are becoming increasingly abundant, and Bluetooth connectivity is one of the most practical functions. Don’t underestimate it; I have a friend who bought a Modern Tucson, and … Read more
PLC Program Errors? How I Solved 90% of Faults with This ‘Reverse Troubleshooting Method’ – A Request for Teaching from Peers! Every time I receive an emergency call late at night to handle a PLC fault on the production line, the pressure is something only those in maintenance can understand. A halted production line, with … Read more
Scenario 284: Unable to Access Log Server Troubleshooting Steps: Verify network connection: ping log_server_ip Check firewall settings on both systems: systemctl status firewalld firewall-cmd –list-all Ensure the log server service is running: systemctl status rsyslog Scenario 285: Excessive Log Volume Troubleshooting Steps: Identify growing log files: du -h /var/log Analyze the contents of large log … Read more
PLC total shutdown? This fault simulation plan reduces downtime by 80%! This step is like giving the PLC a “full check-up,” following the mnemonic “touch, look, smell, and listen”: Touch Temperature: The CPU’s normal temperature should not exceed 60℃. If it feels hot to the touch, quickly simulate a “CPU overheat fault” to see if … Read more
Scenario 274: MySQL/MariaDB Service Fails to Start Issue: MySQL/MariaDB service fails to start. Solution: Check the MySQL/MariaDB error log for details: tail -f /var/log/mysql/error.log Verify if there are errors in the MySQL/MariaDB configuration file: cat /etc/my.cnf # or cat /etc/mysql/my.cnf Check for port conflicts: netstat -tulnp | grep 3306 Ensure there is enough disk space. … Read more
Introduction: The Complex Nature of Packet Loss Issues Network packet loss on Linux servers is one of the tricky problems that operations engineers often encounter. It may manifest as slow application responses, intermittent service interruptions, or degraded user experiences. Unlike systems like Windows, Linux, with its robust network stack and rich diagnostic tools, can achieve … Read more
🧐 The sudden disconnection of WiFi showing as disabled may not only be an issue with the optical modem but could also stem from the router, with various possible causes. 👉 I have compiled the reasons for WiFi displaying as disabled and the corresponding solutions. If you encounter the same issue, feel free to take … Read more
Example 1: It was functioning normally the day before, but suddenly both manual and remote controls stopped working the next day. Analysis and Repair: Based on the fault phenomenon analysis, a power circuit anomaly was suspected. To facilitate repairs, a circuit diagram was drawn based on the physical device, as shown in the attached figure. … Read more
Scenario 264: Email Server Not Responding Symptoms: Users report being unable to send or receive emails. Troubleshooting Steps: Check the email server logs for errors: journalctl -xe | grep postfix Verify that the email server process is running: systemctl status postfix Check network connectivity: telnet localhost 25 Scenario 265: Emails Stuck in Mail Queue Symptoms: … Read more
“PLC Fault Tree Analysis: Identify the Culprit in 3 Steps, Doubling Maintenance Efficiency!” Hello everyone! Is your PLC acting up again? The indicator lights are flashing wildly, and the production line is just lying flat for you to see? Don’t worry! Today, I will teach you how to use the “Fault Tree” tool to master … Read more