Generally we patch processing factory in the maintenance technology yuan will carry out the following operations.
1. Check the components
In SMT chip processing plant in the product needs to be repaired when the first thing to determine, the components of each solder point there is no error, leakage, the existence of the problem, to confirm the authenticity of the material is also a situation that needs to be considered, in view of Jingbang electronics in 2011 from Sweden to import chips were pitted, so the sources of European and American countries are not necessarily all stronger than Huaqiang North. If you exclude the error, leakage, reverse and authenticity of the problem, you can get a faulty circuit board first check whether the board is intact, whether each component is obviously burned has not been inserted wrong.
2. Welding state analysis
Circuit board is basically eighty percent of the poor solder joint, solder joint welding is full, whether there are abnormalities, first of all, we must refer to the ISO9001 quality system management standards, and various SMT processing welding quality standards, check whether there is no false welding, false welding, short circuit, whether the copper skin is obviously warped and other bad visible to the naked eye. If there is a need to rework the bad points of this product, if not, you can proceed to the next step!
3. The direction of the component detection
In the process of this link, we have basically ruled out the naked eye can see some of the bad, now we still need to carefully check the diode, electrolytic capacitors, the most amount of components on the circuit board and other components have provisions for the direction, or positive and negative requirements of the components are inserted in the wrong direction.
4. The tool detection of components
If all the naked eye judgment is no problem, then this time we need to borrow some auxiliary tools, SMT chip processing plant is most commonly used is to use a multimeter to simply measure our resistance, capacitance, transistors and other components, with a multimeter test is the main thing is to check whether the resistance of these components does not meet the normal value of resistance, become larger or smaller, whether the capacitor is open, inductance Whether open circuit these and so on.
5. Power on test
In the above process all completed, basically you can exclude the regular problems of the components, power on words will not be short-circuit or bridge connection, etc. to produce the circuit board ablation damage. You can turn on the power to see if the corresponding function of the board is normal.
Post time: Jun-22-2022