Circuit Troubleshooting

How to Diagnose PROFIBUS Communication Failures? A Systematic Approach to Troubleshooting Fieldbus Connection Issues and Tool Usage!

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How to Diagnose PROFIBUS Communication Failures? A Systematic Approach to Troubleshooting Fieldbus Connection Issues and Tool Usage!

How to Diagnose PROFIBUS Communication Failures? A Systematic Approach to Troubleshooting Fieldbus Connection Issues and Tool Usage! Hello everyone! Today I want to share a “nightmare” in the field of industrial automation—the methods for diagnosing PROFIBUS communication failures. In my over ten years of experience in industrial automation projects, PROFIBUS failures are one of the … Read more

How to Find Drivers for Unknown Devices in Device Manager

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How to Find Drivers for Unknown Devices in Device Manager

After installing Windows, you may find one or more unknown devices with exclamation marks in Device Manager. Even if they have names like PCI Memory Controller, PCI Data Acquisition and Signal Processing Controller, SM Bus Controller, etc., as long as there is an exclamation mark in front, it indicates that the driver is not installed … Read more

A Comprehensive Guide to Linux Hardware Information and Troubleshooting Commands

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A Comprehensive Guide to Linux Hardware Information and Troubleshooting Commands

Today, I will share some hardware-related commands that can be used for daily operations and troubleshooting. Quick Reference Table for Hardware Commands Function Command CPU Information lscpu / cat /proc/cpuinfo Memory free -h / dmidecode -t memory Disk lsblk / fdisk -l / smartctl PCI Devices lspci USB Devices lsusb Motherboard Information dmidecode Temperature Monitoring … Read more

How to Troubleshoot Network Packet Loss in Linux? Finally Understood!

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How to Troubleshoot Network Packet Loss in Linux? Finally Understood!

1. Background: From the image, you can see the potential locations where packet loss may occur, which actually spans the entire network protocol stack. In other words, there is a possibility of packet loss at every stage. • Between two VMs, transmission failures may occur due to errors such as network congestion or line faults; … Read more

Flashing the Allwinner H3 Chip: A Comprehensive Guide

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Flashing the Allwinner H3 Chip: A Comprehensive Guide

★ In the information age, most electronic products require system support to operate perfectly. However, there are times when these systems may malfunction, such as failing to boot. If you don’t know how to flash the firmware, it can be quite frustrating. This tutorial will teach you how to flash the firmware to resolve such … Read more

Mounting SMB on OpenWrt

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Mounting SMB on OpenWrt

Add UserDependenciesopkg install shadow-commonopkg install shadow-useraddAdd SMB Specific Useruseradd YOUR_SMB_USER_NAMEAssociate User with SMB Servicesmbpasswd -a YOUR_SMB_USER_NAMEOpenWrt ConfigurationMount SMB Network ShareHere, fill in the SMB storage information to be mounted on OpenWrt, and you will see the successfully mounted drive at the OpenWrt mount point.Network ShareHere, set up the SMB service on OpenWrt, which means sharing … Read more

Common Faults in LCD TVs: Which Can Be Repaired and Which Cannot?

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Common Faults in LCD TVs: Which Can Be Repaired and Which Cannot?

Those who follow me are the kindest!I only speak for the people, using my pen to clarify the situation and measure the warmth of humanity.Which can be repaired? As an important entertainment device in our daily lives, televisions occasionally experience various faults. These faults not only affect our viewing experience but may also render the … Read more

How to Re-Pair Bluetooth Headphones

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How to Re-Pair Bluetooth Headphones

The steps to re-pair Bluetooth headphones usually vary by brand and model, but most Bluetooth headphones follow a similar general process. Here are the detailed steps and considerations for re-pairing Bluetooth headphones: 1. General Re-Pairing Steps Turn off the Bluetooth headphones Typically, this is done by pressing and holding the power button (some headphones may … Read more

Real Linux Troubleshooting Scenarios: Firewall Configuration and Management

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Real Linux Troubleshooting Scenarios: Firewall Configuration and Management

Scenario 294: Firewall Service Not Running Issue: The firewall service is not running, leading to insecure network access. Troubleshooting Steps: Check the status of the firewall service: systemctl status firewalld If the firewall service is not running, start it: systemctl start firewalld Enable the firewall service to start automatically on boot: systemctl enable firewalld Scenario … Read more

Common Issues and Solutions for Connecting Bluetooth in the Modern Tucson

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Common Issues and Solutions for Connecting Bluetooth in the Modern Tucson

🔥 “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