How to take anti static measures in PCB maintenance?

How to take anti static measures in PCB maintenance?

The maintenance personnel will insert or mount components according to the bill of materials, PCB silk screen printing, and external processing requirements when carrying out PCB maintenance. Still, electronic components are often prone to static electricity, which will release electromagnetic pulses during discharge, so that the calculation Errors occur from time to time. In severe cases, it will cause damage to devices and lines. Only by taking anti-static measures can protect the machines and components.

Specific hazards of static electricity:

1. Harm to the human body: Static electricity makes people uncomfortable and can also cause symptoms such as headache, insomnia, and restlessness, and even lead to rash and arrhythmia, which is even more harmful to neurasthenia and people with mental health conditions.
2. Harm to industry: The generation of static electricity is inevitable in industrial production, and the harm caused by it can be attributed to the following two mechanisms:
1) Hazards caused by electrostatic discharge: cause malfunction or malfunction of electronic equipment, resulting in electromagnetic interference.
2) Breakdown of electronic components or cause component aging, reducing production yield.

Anti-static measures for PCB maintenance:

1. All personnel in contact with components and products must wear anti-static clothing, anti-static wrist straps, and anti-static shoes. Before each job, an electrostatic protection safety inspection must be done, and production can only be done after passing the test.

2. The anti-static system must be grounded reliably.
3. All components are treated as electrostatic sensitive devices to avoid damage caused by static electricity.
4. During the operation, use an anti-static work surface, use an anti-static container for components and semi-finished products, and prohibit placing non-production items on the work surface.
5. Manual welding equipment must be well-grounded, and qualified anti-static tools must be used, which must be tested before use.
1) Tools such as electric soldering iron and tin suction device must be well grounded;

2) Do not use ordinary plastic screwdrivers, plastic tin absorbers, nylon brushes, and labels composed of insulating material layers to prevent static electricity from accumulating. Instead, it is recommended to use an anti-static brush to clean electronic components and PCBs without damaging them due to static electricity.

6. The maintenance personnel should wear anti-static gloves when repairing the PCB. The instrument must be grounded reliably, and the maintenance table should be covered with anti-static rubber pads.
7. Regularly test anti-static tools, settings, and materials.

8. Do not stack assembly boards to prevent mechanical damage. Instead, the soldered PCBs should be inserted on the anti-static printed board frame and in the turnover box to prevent mechanical damage.
The above are all the anti-static precautions in the PCB repair process. Do you understand it?