Manual visual inspection in PCBA processing, China PCB assembly process factory SYS Technology_
Technical
PCB related knowledge- The purpose of each layer of the PCB
How to do heat resistance testing for PCB board
Detailed explanation of rigid-flex board and IC carrier board
PCBA prototype procedure
Defects which can be detected by the SPI
What are the spacing requirements for designing PCB circuit boards?
What are the classification and advantages of PCB metal substrates?
Difference between the processing technology of 1Layer AL PCB and 2Layer AL PCB
Introduction of FPC Cable and its usage
advantages of Shenzhen SMT assembly factory
inspection items before PCB ordering
usages of ceramic substrates
main applications of PCB boards
Cost-effective PCB product services
How to check short circuit of a circuit board during manual soldering
Identify the polarity of electronic components during PCBA processing
Means Which Can Prevent Component Shifting in SMT Processing
Skills of PCB prototype manual soldering
Reasons for the shift of Components in the SMT Process
Seven Types of PCB Probes
What Should Be Paid Attention to in Layout of High-frequency PCB
Precautions for PCB CCL Selection
Advantages of LED Plant growth light
Advantages of using LED grow lights to grow industrial hemp
Detailed explanation of PCB manufacturing process and precautions
Detailed explanation of PCB manufacturing process and precautions
How to draw multilayer PCB on Altium Designer
Three basic elements of interference and how to suppression them.
Decrease interference between digital circuit and analog circuit
SMT Component Placement Process Of Parts : Manual Placement
SMT factory incoming PCB material inspection
Basic concepts commonly used in PCB design
Ideas and principles of High speed PCB layout
Component layout rules and safety distance considerations
SMT assembly process quality specification
5 points in PCB layout
Professional interpretation of SMT
Advantages and disadvantages of different PCB surface treatment
Special process in PCB prototype
Why the via hole become open after component assembly
Keep the cost of the PCB as low as possible
what are the causes of PCB board heating radiation problem
Pad size and via diameter dimensions consideration in PCB prototyping
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?
PCB without fiducial mark, Is There Any Way to do SMT for It
What Are the Benefits of Reserving Break-up Tab for PCB Production
How Does SMT Affect PCB Production Time and Speed It Up
Classification of PCBs from three aspects
Common Problems and Solutions for Dry Film pasting during PCB Manufacturing process
Several Elements to Inspect after PCB Design
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?

Manual visual inspection in PCBA processing

PCBA processing plants attach great importance to quality inspection work, and there are many common quality inspection methods. Manual visual inspection is a cost-effective inspection method for PCBA factories with low process requirements and imperfect equipment. Manual visual inspection in PCBA processing can effectively reduce production defects and improve shipment qualification rate.

Manual visual inspection includes: manual inspection of solder paste printing, manual visual inspection of glue printing, manual visual inspection of solder joints, visual inspection of PCB surface quality and so on. Next, China PCBA processing factory SYS Technology will give you a brief introduction to the main purpose of manual visual inspection.

1. Solder paste printing
First, check whether the basic parameter settings of the solder paste printer are appropriate. The solder paste is printed on the PCB pad, whether the height of the solder paste is the same or presents a "trapezoid" shape, and the edges of the solder paste should not have rounded corners or collapse into a pile shape, but allow some peak shapes caused by pulling up a small amount of solder paste when the stencil is separated. If the solder paste is unevenly distributed, it is necessary to check whether the solder paste on the squeegee is insufficient or distributed uneven, also need to check the printing stencil and other basic parameters. Then check under the microscope whether the solder paste is bright after printing.

2. Placement of electronic devices
Before mount electronic components to the first PCB with solder paste applied, check whether the material racks are properly placed, whether the electronic components are correct, and whether the machine's picking position is appropriate. After completing placement of components to the first PCB, check in detail to see if each electronic component is properly placed and lightly pressed in the center of the solder paste instead of just being "placed" on top of the solder paste.

If you can see a slight depression of the solder paste in the microscope, it means it is placed properly. Are all the electronic devices on the bill of materials (BOM) the same as the electronic devices on the PCBA? All electronic devices that with positive and negative poles, such as diodes, tantalum electrolytic capacitors and ICs, are the orientation of them correct?