PCB Blogger-China PCB Factory,HOYOGO

       In   the SMT processing process, sometimes there will be defects such as misalignment and bridging.   If such defects occur, the PCB needs to be reworked and repaired.  So what are the requirements for the   rework and   repair  technology   of  bad   SMT?       1.  Operators should wear anti-static wrist straps or bracelets.     2. It is generally required to use an anti-static constant temperature electric soldering iron.  If you use a common electric soldering iron, the ground must be good.     3. When repairing chip components, a 15-20W low-power electric soldering iron should be used, and the temperature of the soldering iron tip should be controlled below 250 ℃ .     4. The soldering time should not be too long, otherwise it is easy to burn out the components. soldering times of the same solder joint  shall not   exceed two times.   ...

  Usually, after reflow soldering, the yield rate of PCB cannot reach 100%, and some defects will appear more or less.   Among these defects, some are surface defects, which only affect the surface appearance of solder joints, but do not affect the function and life of the product. However, some defects will seriously affect the function and life of the product, such as: misalignment, bridge connection, etc. Such defects must be reworked and repaired. Do you know any skills for reworking and repairing bad SMT?       1. Manual rework and repair and soldering should follow the principle of SMT components first small and then large, first low and then high. First solder chip resistors, chip capacitors, transistors, then solder small IC devices, large IC devices, and finally solder plug-ins.     2. When soldering chip components, the width of the soldering bit should be consistent with the width of the components. If it is too small, it will not be easy to...