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.
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.
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.
