How to Judge the Acceptance of PCB Quality
Which Color Circuit Board Sells the Most Expensive
Method to Solve the Noise Interference of Power Supply on High-frequency PCB Board
Disassembly Skills of Chip Components on PCB
What Factors Should Be Considered in the Selection of High-frequency PCB CCL
How to Place Special Components during PCB Layout
What Are the Functions of Capacitors in Circuits?
Testing Techniques for Common Electronics Components
What to do if There is a Short Circuit on the PCB
Desoldering Principles and knowhow during PCBA Processing
Black Oxidation of the Inner Layer of the Multilayer PCB
How to Ensure the High-performance Design of PCB
What Is the Printing Process of SMT Solder Paste?
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What Are the Benefits of Reserving Break-up Tab for PCB Production
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Classification of PCBs from three aspects
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What is a halogen-free circuit board?
What Do Capacitive Coupling and Decoupling Mean?
What Are the Differences Between PCB Paste Mask and Solder Mask?
How PCBA Is Packaged and Shipped
How long can PCBA finished products be stored?
What Are the Differences and Relations Between PCB, PCBA, and SMT?
PCB Baking Specifications
PCB "Solder Mask Tenting" and "Solder Mask Opening"
Five reasons for PCB deformation and six solutions
Importance of first article inspection of PCBA board
Temperature zone standard for SMT reflow soldering
Small and medium volume PCB manufacturers in China
The main reason for PCBA cleaning
For power filter, the more capacitors, the better?
What does PCBA programming mean?
Content of PCB incoming testing
What conditions must be met for PCB circuit board soldering?
What is Blind via and Buried via
PCBA Manufacturers Temperature and Humidity Sensitive Components Management
Why choose Shenzhen SMT processing factory?
How long does it take to calculate the quotation for PCBA manufacturing?
Introduction of PCB design clearance requirements
Explanation of BOM, DIP, SMT, SMD
Introduction of the process of PCBA prototype
How to prevent pseudo soldering or cold soldering defects in PCBA manufacturing?
Factors that affect the Price of FPCB
What information is required for SMT processing at PCBA factory?
Skills of using 0ohm resistor in PCB design
How to select a PCBA manufacturer
SMT processing solder joint quality inspection
Characteristics difference between immersion gold PCB and gold plating PCB
Common malfunctions of Circuit Board Caused by Moisture
A Few Rules about PCB Panelization
Compare of multi-layer PCB with single/double layer PCB
Why do we need to introduce so many subdivided GND
Difference between immersion gold boards and gold plating boards
Aluminum PCB structure
Classification of different GND in circuit
Why PCB baking is necessary during manufacturing process
The handle and precautions of OSP board in SMT process
How to choose capacitors for filter decoupling
How to choose filter capacitor for switching power supply
5 database need for SMT process
Function of three-terminal capacitor
Introduction of PCB OSP surface treatment
Method of inspecting the quality of SMT by step
How to find the short point between VCC and GND
Difference between 850nm and 940nm infrared LED
Component layout of PCB SMT DFM
Pad shape influence on the strength and reliability of the soldering joints
The difference between high temperature solder paste and low temperature solder paste
Introduction to manual welding processing
Manual visual inspection in PCBA processing
Characteristics of the conformal coating process
Difference between hardware engineers and software engineers
PCBA processing operation rules
China PCB upstream materials has continued to soar
Difference between serial buses and parallel buses
The key points of quality control in PCBA processing
Common causes of solder beading during SMT process
Analysis of the advantages and disadvantages of HASL PCB surface
Requirements for layout of components during SMT assembly
Selection of electronic components and CCL for PCBA
Performance and appearance quality inspection of components.
Quality and Reliability of SMT Chip Processing and Production
Coupling and decoupling function of capacitor
Two methods to connect digital ground and analog ground
Common sense in SMT process

The key points of quality control in PCBA processing

1. PCBA assembly
The details of the systematic quality control of solder paste printing and reflow soldering temperature are key points in the PCBA manufacturing process. At the same time, for the printing of high-precision circuit boards with special and complex processes, laser stencils need to be used according to specific conditions to meet higher quality requirements and more demanding processing requirements. According to PCB manufacturing requirements and customer product characteristics, some may need to increase U-shaped holes or reduce holes in stencil. The stencil needs to be processed according to the requirements of PCBA processing technology.

Among them, the temperature control accuracy of the reflow oven is very important for the wetting of the solder paste and the firmness of soldering joints, and can be adjusted according to the normal SOP operation guide. In order to minimize the quality defects of PCBA processing in the entire manufacturing process, strict implementation of the AOI test can greatly reduce the defects caused by human factors.

2. DIP plug-in welding
DIP plug-in soldering is the most important and final process in the circuit board assembly processing. In the process of DIP plug-in soldering, the consideration of the furnace jig for wave soldering is very important. use the furnace fixture to greatly increase the yield rate and reduce soldering defects such as tin bridge, little tin, and tin shortage, and according to different requirements of customers’ products, PCBA processing plants must continue to summarize and accumulate experience in practice to achieve technological upgrading.

3. Programming and testing
The manufacturability report is an evaluation work that we should do once received the customer’s production contract. In the DFM report, we can provide some suggestions to the customer before the PCB processing. For example, set up some key test points on the PCB (test point) for the key test of the continuity and connectivity of the circuit after the subsequent PCBA processing. 

When conditions permit, you can communicate with the customer to provide the programming firmware, and then burn the PCBA program into the core master IC through the programmer. In this way, the circuit board can be tested more concisely, so that the integrity of the entire PCBA can be tested and inspected, and defective products can be found in time.

4. PCBA manufacturing test
In addition, many customers looking for one-stop PCBA processing services also have requirements for PCBA back-end testing. The content of this kind of test generally includes ICT (circuit test), FCT (function test), aging test, temperature and humidity test, drop test, etc.
The above four points are the main issues that we must pay attention to in PCBA processing. These are some of the main contents that PCB assembly house SYS Technology shares with you today.