SMT Component Placement Process Of Parts : Manual Placement, China SMT PCBA factory_
Technical
What are the advantages and applications of flexible microcircuits?
FPC Reinforcement Types
Criteria for Classification of electronic Component Classes
Four softwares suitable for beginners to draw PCB circuit boards
What information is needed for SMT processing?
What are the advantages of small and medium batch SMT processing?
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

SMT Component Placement Process Of Parts : Manual Placement

(1) Manual mounting process requirement

1. Improve the production efficiency as much as possible, under the condition of certain human and material resources, achieve the purpose through reasonable arrangement work procedure and adopt the best operation method.

2. Ensure the excellent and stability of product quality. This is reflected in the production process of the product components, semi-finished products in the production line of the high rate of straight-through, the finished product inspection pass rate is high, good consistency of technical indicators; finished products in the unqualified products in the return of failure causes no instability factors or abnormal failure.

3. Ensure that each component can work normally in the whole machine with its original performance after installation. The performance of the components should not be reduced or the parameters should not be changed due to improper installation process.

4. Develop detailed operating specifications. For those installation processes that directly affect the performance of the machine, as far as possible, the use of special tools to reduce the arbitrariness of manual operation.

5. The arrangement of the work sequence to facilitate the operation, in order to maintain the orderly arrangement and transfer of work between. In the installation process, to install large components, auxiliary parts, combined parts on the frame or base plate, when installing, inside and outside, up and down, left and right should have certain regularity, also pay attention to the shape symbol and mark position of each installed device, easy to observe when checking and also pay attention to the sequence order when combining.

(2) The application scope of manual mounting.
1、Because individual components are loose parts, special components don't have corresponding feeder, or because of the device's pin deformation and so on various reasons cause can't realize on the pick& place machine to mount, as the machine mount after the supplementary mount.
2、A small amount of new product development stage or small batch production;
3、Because of the financial shortage, has not introduced the mounting machine, at the same time the product assembly density and difficulty is not very big. (3) the process flow of manual patching.

A. Application of solder paste: can use simple printing tool manual printing solder paste process or manual dispensing machine drop coating solder paste process.

Second, manual mounting: 1. Manual mounting tools (1) stainless steel tweezers (2) suction pen (3) anti-static workbench (4) anti-static wrist strap

2、Placement order 
1), first place small components, then place big components. 
2), first place short component, after place high component. 
3), First light and then heavy. The installation process, first installs the light component, after installs the heavy device. 
4), first after the example installed. Installation process, while using the example, screwing, welding and other processes, should first example, then screwing, and finally welding. 
5), first inside and then outside. In the combination of parts to connect the whole machine, first from the combination of the rack for installation, and then gradually installed to the outside. 
6), Generally arrange the assembly line mounting station according to the kind of components. Each person pastes one kind or several kinds of components; The components with more quantity can also arrange several pasting stations. 
7), Can set up an inspection station behind each mounting station, also can set up an inspection station after several stations, also can complete the whole version inspection after mounting. To set according to the density of the assembly board. 
8), first load conventional, common components, after loading fragile components, can prevent damage in installation. 
9), Keep the work site neat and orderly, effectively control the harm caused by the production residue. 
10), Installers should be responsible and develop good working habits. 
11), The strict operation procedure, the complete protection measure, the perfect fire prevention and the safe use point regulation system etc. are the factors that cannot be ignored in the production.

(3) Manual mounting method 
1) Momentary type, cylindrical Chip component mounting method. Hold the component with tweezers, align the component solder end with the pad at both ends, put it on the pad solder paste centrally, the polar component mounting direction should conform to the requirement of the drawing, after confirming the accuracy, press it gently with tweezers, make the component solder end invade the solder paste. 
2) SOT mounting method Hold the component with tweezers, align the solder end of the component with the pads at both ends, and put it on the pad solder paste centrally, and gently press the component with tweezers after confirming the accuracy, so that the pin of the component is not less than 1/2 thickness into the solder paste, and all the pins of the component are located on the pad. 
3) SOP, QFP mounting method Device 1 pin or front mark align with the front mark of the printed character, hold or suck the device with tweezers or suction pen, align with the mark, align with the pads on both sides or four sides, center the device, and gently press the top surface of the device body with tweezers so that the component pins are not less than 1/2 thickness into the solder paste, requiring all the component pins to be located on the pad. Pin pitch 0.65mm below the narrow pitch device should be mounted under 3~20 times microscope. 
4) SOJ, PLCC mounting method SOJ, PLCC mounting method is similar to SOP, QFP, because the pins of SOJ, PLCC are at the bottom of the device, so when aligning, it is necessary to check whether the pins and pads are aligned by eye from the side of the device and the PCB board into 45 degree angle.