"Problems" Concerning SMT Manual Maintenance and PCB Proofing

"Problems" Concerning SMT Manual Maintenance and PCB Proofing
Manual Maintenance Skills in Maintenance Patch Factory
Although SMT processing is now automated, this does not mean that manual operation is not required. In fact, manual operation is inevitable in the process of SMT chip processing and maintenance. As an operator, you must master manual maintenance skills. So, what are the manual repair skills in SMT patch processing and repair? Let me talk about it in detail below.
1. Tools and materials
Generally speaking, 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 contact the welding spot on the heated iron head or iron ring. The soldering iron ring is more suitable for removing the bonding parts. They are effective for rectangular or cylindrical components and integrated circuits, but have little effect on four sided plastic encapsulated components.

In addition to the main tools and materials, manual maintenance also requires some auxiliary tools and materials, such as tweezers, vacuum suction pens, tape for cleaning pads and magnifying glasses for quality inspection.
SMT patch processing and maintenance methods
Type 1: On the premise of no hot air gun, select a pincer soldering iron and clamp the components on the IC side with the pincer soldering iron to prevent them from moving The heat from the melting tip will be transferred to each pin Therefore, it must be noted that PLCC components removed by this method cannot be reused, and the high temperature of large area melting can easily damage the circuit board In addition, the low cost of the clamp soldering iron is relatively high, and the weak smt chip processing manufacturers usually do not
The second type: blow welding with hot air gun. After all lead solders are melted, remove the IC and clean it with a tin strip.
In smt chip 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, we can better judge the maintenance situation based on experience and professional knowledge, make appropriate response according to the specific situation, remedy and reduce losses.
It is worth noting that the circuit boards in the game industry are coated with protective glue to prevent water and shock During manual maintenance, after the solder melts, the protective adhesive must be removed with the tool in hand before removing the components In addition, pay attention to the glue in the next operation, otherwise, the components will not be firmly fixed
Reminder: SMT patch processing and maintenance are manual, and you must have enough patience and operating skills. Beginners only need to operate skillfully. In this regard, when selecting a smt chip processing and maintenance plant, a professional, regular and powerful manufacturer must be selected to ensure the maintenance effect and the quality of future products.
"Question" answers to PCB proofreading questions
PCB is the abbreviation of printed circuit board. PCB proofing is to produce a small number of samples for testing before mass production. This also answers the market's question about what PCB proofing is. Many electronic manufacturing companies will find some professional PCB proofing manufacturers to cooperate, so what problems should be paid attention to in the PCB proofing process?
1. Note the number of samples
Before mass production, the company usually needs to make a batch of PCB prototypes for testing, which actually takes up a certain cost of the company. Especially when the company is large in scale and produces multiple types of PCBs, the cost of PCB proofing and testing is also very considerable From this point of view, the company should pay attention to the sample quantity during PCB proofing
Secondly, confirm the equipment package
It is a process in the manufacturing process of circuit boards to weld chips with specific functions on circuit boards and package them with mask covers. During PCB proofing, customers should pay special attention to whether internal chips and electronic components are welded incorrectly during packaging to ensure the quality of PCB proofing, and then be able to verify functions and follow up further mass production.
Third, do a good job in power inspection
After PCB proofing, the company shall conduct a comprehensive power inspection to ensure that every function and every detail of the PCB are checked. This is the significance of PCB proofing, and also whether the subsequent PCB can be put into production on a large scale and ensure extremely low defects under the guarantee rate. It is recommended that the customer and the school cooperate to conduct a comprehensive power inspection, which is a more strict test method.
Of course, there are some signal integrity layouts that need both parties to pay attention to and solve, but in general, the problems that need attention in PCB proofing are roughly the above items Although there are many doubts about the meaning of PCB proofing in the market, as an insider, thorough investigation and testing of the above issues is the basis for ensuring the quality of PCB samples and converting them into subsequent batch production PCB proofing must be taken seriously

The above is the explanation given by the editor of pcb circuit board company.
If you want to know more about PCBA, you can go to our company's home page to learn about it.
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