Mar26
What is AOI? What Defects Can 2D AOI Detect in PCB Assembly?

post on March 26, 2024

What is AOI (Auto Optical Inspection)What Defects Can AOI Detect on PCB Assembly?

AOI (Auto Optical Inspection) is an automated optical recognition system that has become widely used in the electronics industry for inspecting the quality of soldering, component placement accuracy and the presence of missing components on PCBA (Printed Circuit Board Assembly) production lines, replacing human visual inspection processes.

(Please note: The AOI mentioned in this article refers to 2D AOI. Nowadays, there are 3D AOIs available on the market that provide more detailed three-dimensional image inspection, improving the detection rate of AOI.)

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Process, Quality, SMT, Test/Inspection     WorkingBear    Views (4,874)     comment (0)

Mar19
The Purpose of Nickel (Ni) Plating on Components or Circuit Boards in the Electronics Industry

post on March 19, 2024

The Purpose of Nickel (Ni) Plating on Components or Circuit Boards in the Electronics Industry

Firstly, let’s clarify that Workingbear is not a metallurgy expert. The content of this article is based purely on personal experience and information gathered from the internet. If there are any errors, feel free to point them out for correction. However, Workingbear takes no responsibility for any consequences.

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Fundamental Science, PCB/FPC/PTF, Soldering     WorkingBear    Views (3,388)     comment (0)

Mar12
Why Do PCBs Have Those Small Circles? What purpose of Test Points on PCBs?

post on March 12, 2024

Why Do PCBs Have Those Small Circles? What purpose of Test Points on PCBs?

Have you ever noticed those tiny circles on PCBs and wondered why they’re there? They don’t seem to have any parts soldered onto them, and some don’t even have solder paste. Well, those small circles are called test points, and they play a crucial role in ensuring that the electronics on the PCB are working correctly during the assembly process.

For those who know about electronics, having test points on a PCB is common knowledge. However, for those with a background in mechanics or other fields, the term “test point” might be a bit confusing.

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PCB/FPC/PTF, Process, Test/Inspection     WorkingBear    Views (2,229)     comment (0)

Mar05
What are ICT(In-Circuit Test) and MDA(Manufacturing Defects Analyzer) in Electronics Manufacturing? Any Benefits?

post on March 5, 2024

What are ICT (In-Circuit Test) and MDA(Manufacturing Defects Analyzer) in Electronics Manufacturing? Any Benefits to Implementing Them?

Do you know what ICT (In-Circuit Test) is? Please note that we are not talking about Information and Communication Technology (ICT) here. And what about MDA (Manufacturing Defects Analyzer)? If these tests are commonly implemented in PCB assembly manufacturing, what are their pros and cons? How do they differ from ATE (Automated Test Equipment)?

ICT is primarily used for the electrical testing of Printed Circuit Board Assemblies (PCBA). Think of it as an advanced “multimeter” or an LCR meter. It allows us to test the electrical characteristics and check for open/short circuits of all components on the circuit board without removing them.

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Test/Inspection     WorkingBear    Views (4,398)     comment (0)
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Feb27
What is Graping Solder Defect in SMT Assembly? How to Fix it?

post on February 27, 2024

What is Graping Solder Defect in SMT Assembly? How to Fix it?

In the reflow soldering process of Surface Mount Technology (SMT) in electronic assembly, the occurrence of “Graping” solder defect refers to the situation where the solder paste does not completely melt and joint together during reflow. Instead, individual solder powders gather and stack together, resembling a cluster of grapes.

So, how does this “Graping” solder defect happen? Solder paste is essentially a mixture of tiny solder powders combined with flux. When the flux in the solder paste evaporates, it leaves behind individual solder powders.

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Process, Quality, SMT, Soldering     WorkingBear    Views (4,753)     comment (0)
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