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PCBA Tech
SMT patch processing and maintenance skills
PCBA Tech
SMT patch processing and maintenance skills

SMT patch processing and maintenance skills

2021-11-06
View:47
Author:Downs

 Although smt patch processing is now automated, it does not mean that no manual work is required. In fact, manual operation is inevitable in the process of smt patch processing and maintenance. Therefore, as an operator, you must master manual maintenance skills. So, what are the manual repair skills in smt patch processing and repair? Below, I will talk about it in detail for everyone.

   1. Tools and materials

   In general, there are two common manual repair methods, one is contact welding repair, the other is heating gas welding repair. The contact welding repair method is to directly touch the solder joints on the heated soldering iron tip or soldering iron ring. Soldering iron rings are more suitable for removing glue-bonded components. They are effective for rectangular or cylindrical components and integrated circuits, but have little effect on four-sided plastic-encapsulated components.

pcb board

   In the manual soldering repair process, flux and solder paste are needed. The purpose is to prevent the solder, component pins, pads, etc. from being rapidly oxidized. At the same time, the solder on the pad is used for soldering to fix the components and reduce the occurrence of false soldering and continuous soldering failures.

   In addition to the main tools and materials, manual maintenance also requires some auxiliary tools and materials, such as tweezers, vacuum suction pens, suction tape to clean the pads, and a magnifying glass to check the quality.

   Two, smt patch processing and maintenance methods

   The first type: Under the premise of not having a hot air gun, choose a pincer-shaped soldering iron, and clamp the component with a pincer-shaped soldering iron on the IC side to prevent it from shifting. The heat of the soldering iron tip will be transferred to each pin after it has melted. Therefore, it must be noted that the PLCC components removed by this method cannot be reused, and the high temperature of melting in a large area can easily cause damage to the circuit board. In addition, the low cost of the pincer-shaped soldering iron is relatively high, and the weak smt chip processing manufacturers generally do not have it.

   The second type: Blow welding with a hot air gun. After all the lead solders have melted, remove the IC, and then clean it up with a soldering tape.

   In smt patch processing and maintenance, manual operation is much easier than machine disassembly, and this method can also ensure that the loss of components is lower. Not only that, because it is manual maintenance, so based on experience and professional knowledge, we can better judge the maintenance situation, make appropriate responses according to the specific situation, remedy, and reduce losses.

It is worth noting that the PCB circuit boards of the gaming industry are coated with protective glue for the purpose of waterproof and shockproof. In the manual repair process, after the solder has melted, the protective glue must be removed with the tool in hand and then the components are removed. . In addition, in the next operation, pay attention to the glue, otherwise the components will not be firmly fixed.

   Warm reminder: The smt patch processing and maintenance are performed manually, and you must have enough patience and operating skills. Beginners only need to be proficient to operate. Therefore, when choosing an smt patch processing and repair factory, you must choose a professional, formal, and powerful manufacturer, so as to ensure the repair effect and ensure the quality of future products.