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PCBA Maintenance

PCBA Maintenance
During the production and use of SMT patch processing, problems will occur due to factors such as processing errors, improper use,  . Because many products just don't need all replacements. This requires certain repairs and maintenance of the circuit board inside. Then it involves the repair of the circuit board!

In general, the maintenance technology in our patch processing factory will perform the following operations.
1. Check components
When the product needs to be repaired in the SMT patch processing plant, it is first necessary to determine whether the components of each solder joint have errors, leaks, and inversions. Confirming the authenticity of no materials is also a situation that needs to be considered. Not all are stronger than Huabeibei. If the problems of error, leakage, inversion and authenticity are ruled out, you can get a faulty circuit board and first check whether the circuit board is intact and whether the various components are obviously burned out and inserted correctly.
2.Analysis of welding status
Basically, 80% of the defects of the circuit board are the defects of the solder joints. Whether the solder joints are full and whether there are abnormalities, first of all, please refer to the management standards of the ISO9001 quality system, and various SMT processing welding quality standards, check whether there are Defective welding, false welding, short circuit, whether the copper skin is obviously raised and other defects that are visible to the naked eye. If there is, you need to repair the defective points of this product, if not, you can proceed to the next step!
3. Detection of component direction
In the process of this link, we have basically ruled out some defects that can be seen by the naked eye. Now we must carefully check the diodes, electrolytic capacitors, etc. The most used components on the circuit board, there are other provisions on the direction, or positive Are the required components of the negative pole inserted in the wrong direction?

4. Tool inspection of components
If all the naked eye judges that there is no problem, we need to borrow some auxiliary tools at this time. The most commonly used in SMT patch processing factory is to use a multimeter to simply measure our resistance, capacitance, triode and other components, use a multimeter The most important thing to check is to check whether the resistance value of these components does not meet the normal value, become larger or smaller, whether the capacitor is open, whether the inductance is open, etc.
5. Power-on test
After the above process is completed, the conventional problems of the components can be basically eliminated. If the power is turned on, there will be no ablation damage of the circuit board due to short circuit or bridging. You can turn on the power and check whether the corresponding function of the circuit board is normal.
Basically, after all the processes are completed, the BOM and Gerber of the customer are eradicated, and the schematic diagrams can be used to judge and repair the defects of the customer's products. In the patch processing plant, our technicians in the maintenance department are carefully selected from the workshop Professional player.