WO2020052051A1

WO2020052051A1 - Integrated clamp and welding method for 5g sfp encapsulation type optical transceiver module welding

Info

Publication number: WO2020052051A1
Application number: PCT/CN2018/115502
Authority: WO
Inventors: 赵关宝; 施伟明; 徐虎; 孙权; 吴贝佳
Original assignee: 江苏亨通光网科技有限公司; 江苏亨通光电股份有限公司
Priority date: 2018-09-10
Filing date: 2018-11-14
Publication date: 2020-03-19
Also published as: CN108907399B; CN108907399A

Abstract

An integrated clamp for 5G SFP encapsulation type optical transceiver module welding, comprising a working table (1). A flexible board welding part (2) and an optical device welding part (3) are respectively disposed at the upper end positions of two ends in the length direction of the working table (1); the flexible board welding part (2) is used for pre-fixing and pre-welding a PCB and a flexible PCB; the optical device welding part (3) welds the semi-finished device and optical device completed by the flexible board welding part (2) into a complete 5G SFP encapsulation type optical transceiver module device. The clamp enables the production qualification rate of a 5G SFP encapsulation type optical transceiver module to be increased by 10% or more and the production cycle to be shortened by 90% or more, so that the welding operation is easy, the welding performance is reliable, and clamp processing is simple and easy.

Description

Integrated fixture and method for welding 5G SFP package optical transceiver module

Technical field

[0001] The present invention relates to the technical field of optical device manufacturing, and in particular to an integrated fixture for welding a 5G SFP package-type optical transceiver module. The present invention also provides a welding method using the fixture for welding.

Background technique

[0002] According to the current 5G planning, the rate will reach 10-100 times that of 4G networks. At this rate, base stations must use optical modules to achieve service functions, so the demand for optical modules in 5G will be far. More than 4G demand for optical modules. The core components in 5G base stations and 5G transmission equipment are 8G and 100G SFP packaged optical modules. According to data from the Ministry of Industry and Information Technology, the total global 5G optical module market size has reached 200 billion US dollars. The main packaging form of common 5G optical transceiver modules is SFP. This type of packaging covers multiple scenarios from multi-mode to single-mode, from dual-fiber bidirectional to single-fiber bidirectional. With the further development of technology and the reduction of cost and efficiency, Improved, see the production process of 4G optical transceiver module: pin header and OSA are separately welded from PCBA, low yield, difficult to repair, easy to damage the optical module, even scrapped, workers are not good on the base when clamping PCBA, welding Pass rate is low.

[0003] With the development of 5G technology, the speed of optical modules is required to be higher and higher, the cost is lower and lower, and the sensitivity is getting higher and higher. However, there is a serious contradiction between the production welding and the quantity of 5G optical transceiver modules that meet these characteristics, especially the large-scale processing problem has been the bottleneck of high-speed, low-cost production capacity of 5G optical transceiver modules.

Summary of invention

technical problem

Problem solution

Technical solutions

[0004] In view of the above problems, the present invention provides an integrated fixture for welding of 5G SFP packaged optical transceiver modules, which improves the production qualification rate of 5G SFP packaged optical transceiver modules by more than 10%, and reduces the production cycle by 90%. The above makes the welding operation convenient, the welding performance is reliable, and the fixture processing is simple and convenient. [0005] An integrated fixture for welding a 5G SFP package-type optical transceiver module is characterized in that it includes a working base, and a soft board welding part and an optical device welding part are respectively arranged on the working base. At the upper ends of the two ends in the length direction, the soft board welding part is used for pre-fixing and pre-welding the PCB circuit board and the PCB soft board, and the optical device welding part is a semi-finished device completed by the soft board welding part, light The device is soldered into a complete 5G SFP packaged optical transceiver module device.

[0006] It is further characterized in that: the working base is made of aluminum alloy material, which can make the device and the ground conduct;

[0007] The soft plate welding part specifically includes a welding operation table and a welding combination jig, and the welding combination jig specifically includes a pair of reversible pressure plates, and the welding operation table is located on the front end of the work base in the longitudinal direction. On the end face, an inner recessed hole is provided in the center of the welding operation table, the inner recessed hole is communicated to the front end surface of the working base, and an elevating support seat is provided in the inner recessed hole. A pressure plate is provided on each side of the end position, and the convex end of the first double spring is fixedly connected to the length central area of each pressure plate. The bottom of the first double spring is provided with a tightness adjusting device. The lower end surface of the inner end in the length direction of the pressure plate presses the PCB circuit board and the PCB flexible board to be welded, and a sliding long groove is formed between the two sides of the lifting support base and the side wall of the recessed hole. The width distance is a fixed value, which allows components to be welded of different lengths and heights to be placed on the welding operation table for welding;

[0008] The welding operation table can perform single-sided welding or double-sided welding;

[0009] A second double spring perpendicular to the upper end surface of the lifting support base is respectively provided around the lifting support base, and corresponding tightness adjusting devices are respectively provided at the bottoms of the four second double springs, which are located at the same position. The input end of the tightness adjustment device on the side is set by a connecting shaft transmission, the connecting shafts on both sides are connected to the input gear through an intermediate transmission gear, the output gear is sleeved on a retractable input shaft, and the inner end of the input shaft An axial spring is provided, and a portion of the front surface of the input shaft exposed on the working base is provided with a radial side protrusion, and the radial side protrusion is clamped in a large-diameter card groove of a circumferential ring cloth in a locked state. Inside, the tightness of each second double spring can be accurately obtained according to the position of the radial side convex card installed in the large-diameter card slot, to ensure that the tightness is adjusted in time, and the reasonable force of the components to be welded is ensured;

[0010] When it is necessary to adjust the tightness of the second double spring, the input shaft is pressed so that the radial side projection is retracted under the action of the axial spring, and then the input shaft is rotated to align the radial side projection with the large diameter to be set. The slot, and then loosen the input shaft, so that the radial side of the input shaft is clamped in the corresponding position under the action of the axial spring Just inside the large diameter card slot;

[0011] The welding part of the optical device includes a welding abutment located at a rear end in the length direction of the working abutment, the welding abutment is provided with at least one set of recessed positioning holes of a corresponding model, and the center of the welding abutment An upper bump is provided, and support rods are respectively fixed on both sides of the welding abutment, and the length direction of each support rod is arranged in parallel along the length direction of the working abutment, and the cross section of each support rod is It is a right-angled triangle structure in which the right-angled sides of the two support rods are arranged on the upper end face, and the oblique sides of the two support rods are arranged opposite to each other, so that the surfaces of the two support rods and the welding abutment are formed. A guide groove closed from the bottom up, which ensures that the position of the device is accurate and reliable;

[0012] Preferably, the welding base is provided with two sets of recessed positioning holes of corresponding models to ensure the universality of the two signal products;

[0013] The lower end of the front part of the working abutment is provided with a plug-in slot structure, which can be used for convenient plug-in and pull-out inside the automatic welding equipment, realizes the automation of welding overturning, and reduces the impact of welding quality originally caused by overturning .

[0014] A welding method for welding a 5G SFP package-type optical transceiver module, which is characterized in that: a PCB circuit board and a PCB flexible board are pre-fixed and pre-welded at a flexible board welding part, and then the flexible board is The semi-finished components and optical components completed in the welding part are welded into the complete 5G SFP packaged optical transceiver module device.

[0015] It is further characterized by:

[0016] The specific steps of welding the flexible board by hand are as follows:

[0017] 1. Wear an anti-static bracelet, insert the bracelet into the ground point of the workbench, so that the bracelet is connected to the ground of the workbench;

[0018] 2. Open the electric soldering iron and check whether the soldering iron is normal. When the soldering iron is working normally, adjust the temperature of the soldering iron to 360 ± 20 ° C, and clean the tip of the soldering iron;

[0019] 3. After assembling the flexible board to the PCB of the corresponding model, cut the pins to 2-6mm, press the flexible board to the end with tweezers, and then solder with tin;

[0020] 4, the welding process requires full solder joints without tipping, no virtual welding;

[0021] 5. Visually inspect the solder joints of the module for false soldering, missing soldering, short circuit, and tipping, check whether the order of the pins is wrong, and move to the next process under the condition of ensuring no errors. [0022] The specific steps of welding the product by welding the optical device are as follows:

[0023] 1. After the soft board of the receiving module and the soft board of the transmitting module are respectively welded to the PCB, the all-copper board faces upward and the wiring plane faces downward;

[0024] 2. The receiving component and the transmitting component are respectively installed in a flexible board, and the flexible board has a wiring surface facing upward for component welding.

[0025] 3. Operators follow the plug-in principle: first small, then large, light first, then heavy, low first, then high, inside and outside, insert the device into the corresponding pad hole of the PCB board, and place the PCB board in the tray. Transfer to welding process;

[0026] 4. Place the soldering iron head on the pad of the part to be soldered to increase the temperature of the solder joint;

[0027] 5. Use a solder wire to contact the welding place, melt an appropriate amount of solder, and add the solder wire from the side of the soldering iron head;

[0028] 6. After several seconds from the beginning of melting of the solder wire, first remove the solder wire, and then remove the electric soldering iron;

[0029] 7. After the solder joint is cooled, the pin of the component is cut off with diagonal pliers, and the length of the pin is determined according to the requirements of the structure drawing.

The beneficial effects of the invention

Beneficial effect

[0030] After the above technical solution is adopted, a welding integrated fixture for a 5G SFP package type optical transceiver module is welded using a single piece of plate with high hardness, light weight and high electrical conductivity, and the clamping provided on the work base The mechanism is used in conjunction with the welding operation table on which the weldment is placed; it is integrated with the welding part of the flexible board and the welding part of the optical device, and combined with the insertion slot can be used for convenient insertion and extraction inside the automatic welding equipment, and realizes the automation of welding flip. It reduces the impact of welding quality caused by overturning, simplifies the operation of workers, requires very little manual operation, requires less skilled workers and operating technology, guarantees the quality of welding products, and improves welding efficiency And the degree of automation. At the same time, another feature of the present invention is that it can protect the 5G SFP package type optical devices from damage caused by electrostatic problems to the greatest extent.

[0031] The light-emitting integrated sub-module of the present invention has a compact structure and integrated molding, which can effectively reduce manufacturing costs. At the same time, using this integrated welding method shortens the welding time, only needs one tenth of the conventional test time, and improves the welding efficiency. The invention improves the quality and reliability of the 5G SFP package type optical transceiver module. Great effect, shortened the product launch cycle; In summary, it increased the production qualification rate of 5 G SFP package optical transceiver modules by more than 10%, and the production cycle was reduced by more than 90%. The welding operation is convenient, the welding performance is reliable, and the fixture processing is simple and convenient.

Brief description of the drawings

BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG. 1 is a schematic perspective structural view of an integrated fixture according to the present invention;

[0033] The names corresponding to the serial numbers in the figure are as follows:

[0034] Work abutment 1, soft plate welding portion 2, optical device welding portion 3, welding operation table 4, pressure plate 5, recessed hole 6, lifting support base 7, first double spring 8, slackness adjusting device 9, Sliding long groove 10, second double spring 11, connecting shaft 12, input shaft 13, radial side protrusion 131, large diameter groove 14, welding base 15, upper bump 16, support rod 17, guide groove 18, T046 Hole 19, T056 hole 20, mating slot structure 21.

The best embodiment for carrying out the invention

Best Mode of the Invention

[0035] An integrated fixture for welding a 5G SFP package-type optical transceiver module, as shown in FIG. 1: It includes a working base 1, a flexible board welding part 2 and an optical device welding part 3 are respectively arranged on the working base The upper positions of the two ends of the stage 1 in the length direction. The flexible board welding part 2 is used for pre-fixing and pre-welding the PCB circuit board and the flexible PCB. The optical device welding part 3 is a semi-finished device and an optical device completed by the flexible board welding part 2. Welding becomes a complete 5G SFP package type optical transceiver module device.

[0036] The working base 1 is made of aluminum alloy material, which can make the device and the ground conduct;

[0037] The soft plate welding part 2 specifically includes a welding operation table 4, a welding combination jig, and the welding combination jig specifically includes a pair of reversible pressure plates 5, the welding operation table 5 is located at the upper end surface of the longitudinal front end of the work base 1, The center of the operation table 4 is provided with a recessed hole 6 which is communicated to the front end surface of the working base 1. The recessed hole 6 is provided with a lifting support 7 and both sides of the rear end position of the recessed hole 6 A pressing plate 5 is respectively provided, and the convex end of the first double spring 8 is fixedly connected to the central area of the length of each pressing plate 5. The bottom of the first double spring 8 is provided with an elasticity adjusting device 9 (belonging to the existing mature structure, Only shown in the figure), the lower end surfaces of the inner ends in the length direction of the two pressing plates 5 are pressed with the PCB circuit board and the flexible PCB to be welded, and a sliding long groove is formed between the two sides of the lifting support base 7 and the side wall of the recessed hole 6. 10. The width distance of the inner recessed hole 6 is a fixed value, which allows components to be welded of different lengths and heights to be placed on the welding operation table for welding;

[0038] The pressure plate 5 is pressed and opened by the lever principle, which respectively drives the inner and outer ends of the length of the pressure plate 5 to complete the pressure plate attachment and opening action; [0039] The welding operation table 4 can perform single-sided welding or double-sided welding;

[0040] Around the lifting support base 7, second double springs 11 perpendicular to the upper end surface of the lifting support base 7 are respectively provided, and the bottoms of the four second double springs 11 are respectively provided with corresponding tightness adjusting devices (not shown in the figure). (Out), the input ends of the tightness adjustment devices on the same side are set through the connecting shaft 12 and the connecting shafts 12 on both sides are connected to the input gear through intermediate transmission gears (the mechanical transmission is a mature transmission technology, not shown in the figure) The output gear is sleeved on the retractable input shaft 13. The inner end of the input shaft 13 is provided with an axial spring. The front surface of the input shaft 13 exposed on the working base is provided with radial side protrusions 131. The side convex 131 is clamped in the large-diameter card slot 14 of the circumferential ring cloth. According to the position of the radial side convex 131 is snapped in the large-diameter card slot 14, the tightness of each second double spring 11 can be accurately obtained to ensure timely Adjust the tightness to ensure the reasonable stress of the components to be welded;

[0041] When the tightness of the second double spring 11 needs to be adjusted, the input shaft 13 is pressed so that the radial side projection 131 is retracted under the action of the axial spring, and then the input shaft 13 is rotated to align the radial side projection 131 as required. The large-diameter card slot 14 is set, and then the input shaft 13 is loosened, so that the radial side of the input shaft 131 is convex in the large-diameter card slot 14 corresponding to the axial spring;

[0042] The optical device welding portion 3 includes a welding base 15 located at the rear end in the length direction of the work base 1. The welding base 15 is provided with at least one set of recessed positioning holes of a corresponding model, and the center of the welding base 15 is provided with an upper The bumps 16 and the support base 15 are respectively fixed with support rods 17 on both sides, and the length direction of each support rod 17 is arranged in parallel along the length direction of the work base 15. The cross section of each support rod 17 is a right triangle In the structure, one of the two supporting rods 17 is arranged at the upper end side, and the oblique sides of the two supporting rods 17 are arranged opposite to each other, so that the surfaces of the two supporting rods 17 and the welding base 15 form a bottom-up guide. The slot 18 and the guide slot 18 ensure that the position of the device is accurate and reliable.

[0043] In a specific embodiment, two sets of corresponding recessed positioning holes are provided on the welding base, respectively T046 holes 19 and T056 holes 20, T046 holes 119 and T056 holes 20 are for optical transmission and reception for 5G SFP package types. The device size is customized, which ensures the universality of the integrated fixture for the two types of products;

[0044] The lower end of the front part of the work base 1 is provided with a plug slot structure 21, which can be used for convenient plugging inside the automatic welding equipment, realizes the automation of welding flip, and reduces the impact of the welding quality originally caused by the flip. .

[0045] A soldering method for soldering a 5G SFP packaged optical transceiver module: First, a PCB circuit board and a PCB The flexible board is pre-fixed and pre-welded in the flexible board welding part, and then the semi-finished device and optical device completed in the flexible board welding part are welded in the optical device welding part to become a complete 5G SFP packaged optical transceiver module device

[0046] The specific steps of welding the flexible board by hand are as follows:

[0047] 1. Wear an anti-static bracelet, insert the bracelet into the ground point of the workbench, so that the bracelet is connected to the ground of the workbench;

[0048] 2. Open the electric soldering iron and check whether the soldering iron is normal. When the soldering iron is working normally, adjust the temperature of the soldering iron to 360 ± 20 ° C, and clean the tip of the soldering iron;

[0049] 3. After assembling the flexible board to the PCB of the corresponding model, cut the pins to 2-6mm, press the flexible board to the end with tweezers, and then solder with tin;

[0050] 4. The welding process requires that the solder joints be full and without tipping, and no virtual soldering;

[0051] 5. Visually inspect the solder joints of the module for false soldering, missing soldering, short circuit, and tipping, check whether the order of the pins is wrong, and move to the next process under the condition of ensuring no errors.

[0052] The specific steps of welding the product by welding the optical device are as follows:

[0053] 1. After the receiving component soft board and the transmitting component soft board are respectively welded to the PCB, the all-copper board faces up and the wiring faces face down;

[0054] 2. The receiving component and the transmitting component are respectively mounted on a flexible board, and the flexible board has a wiring surface facing upward for component welding.

[0055] 3. Operators follow the plug-in principle: first small, then large, light first, then heavy, low first, then high, inside and outside, insert the device into the corresponding pad hole of the PCB board, and place the PCB board in the tray. Transfer to welding process;

[0056] 4. Place the soldering iron head on the pad of the part to be soldered to increase the temperature of the solder joint;

[0057] 5. Use a solder wire to contact the welding place, melt an appropriate amount of solder, and add the solder wire from the side of the soldering iron head;

[0058] 6. After several seconds from the beginning of melting of the solder wire, remove the solder wire first, and then remove the electric soldering iron;

[0059] 7. After the solder joint is cooled, the pin of the component is cut off with diagonal pliers, and the length of the pin is determined according to the requirements of the structure drawing.

[0060] During the welding process, the time, direction and speed of removing the soldering iron head determines the quality of the welding point. The correct method is to slow down and then fast. Remove the soldering iron head and move it in a 45 ° angle direction to clean the soldering iron head in time. ;

[0061] Filling more than 90% of the tin inside the solder joint is a qualified product, otherwise false soldering is not allowed; [0062] The solder joint has a special gloss and good color; there should be no obvious defects such as unevenness, lightness and darkness in gloss, height and color. There should be no sharp points, lack of tin, or bead dirt on the solder joints. Welding requires one-time forming without warping or falling off.

[0063] The present invention patent is an integrated combination of a flexible board welding part and an optical device welding part, and combined with the insertion slot 15 can be used for convenient insertion and removal inside the automatic welding equipment, realizing the automation of welding flipping, and reducing the original caused by flipping. The impact of welding quality simplifies the operation of workers, requires very little manual operation, requires less proficiency of workers and operating technology, guarantees the quality of welding products, improves welding efficiency and automation. At the same time, another feature of the present invention is that it can protect the 5G SFP package type optical device from damage caused by electrostatic problems to the greatest extent.

[0064] The light emitting integrated sub-module of the present invention has a compact structure and integrated molding, which can effectively reduce manufacturing costs. At the same time, this integrated welding method is used to shorten the welding time (only one tenth of the conventional test time) and improve the welding efficiency. The invention improves the quality and reliability of the 5G SFP package type optical transceiver module. To a great effect, shorten the cycle of product launch.

[0065] The specific embodiments of the present invention have been described in detail above, but the content is only the preferred embodiments created by the present invention, and cannot be considered to limit the implementation scope of the invention creation. All equal changes and improvements made in accordance with the scope of the present invention shall still fall within the scope of this patent.

Claims

Claim

[Claim 1] An integrated fixture for welding a 5G SFP package optical transceiver module, characterized in that

: It comprises a working base, a flexible board soldering part and an optical device soldering part are respectively arranged at the upper end positions of both ends of the working base in the longitudinal direction, and the flexible board soldering part is used for PCB circuit board and PCB soft The board is pre-fixed and pre-welded, and the optical device welding part welds the semi-finished device and the optical device completed by the soft board welding part into a complete 5G SFP packaged optical transceiver module device.

[Claim 2] The integrated fixture for welding a 5G SFP packaged optical transceiver module according to claim 1, wherein the working base is made of an aluminum alloy material.

[Claim 3] The integrated fixture for welding the 5G SFP package optical transceiver module according to claim 1, characterized in that: the soft board welding part specifically comprises a welding operation table, a welding combination fixture, and The welding combination fixture specifically includes a pair of reversible pressure plates, the welding operation table is located at an upper end surface of a longitudinal end of the work base, and a center of the welding operation table is provided with an inner recessed hole, and the inner recessed hole A front end surface communicating with the working abutment is provided with a lifting support seat in the inner recessed hole, and a pressure plate is respectively arranged on both sides of the rear end position of the inner recessed hole, and the length central area of each pressure plate is fixed respectively. The outer convex end of the first double spring is connected, and the bottom of the first double spring is provided with a tightness adjusting device, and the lower end faces of the inner ends in the length direction of the two press plates are pressed with the PCB circuit board and the PCB flexible board to be welded A sliding long groove is formed between two sides of the lifting support seat and a side wall of the recessed hole, and the width distance of the recessed hole is a fixed value.

[Claim 4] The integrated fixture for welding a 5G SFP package optical transceiver module according to claim 3, characterized in that: the welding operation table can perform single-sided welding or double-sided welding.

[Claim 5] The integrated fixture for soldering a 5G SFP packaged optical transceiver module according to claim 3, characterized in that: four sides of the lifting support base are respectively provided with perpendicular to the lifting support base. The second double springs on the upper end face, and the bottoms of the four second double springs are respectively provided with corresponding slackness adjusting devices. The input ends of the slackness adjusting devices on the same side are driven by a connecting shaft. The connecting shaft is connected to the input gear through an intermediate transmission gear, and the output gear is sleeved on a retractable input shaft. An axial spring is provided at the end, and a radial side protrusion is provided on the front surface portion of the input shaft exposed from the working base. Inside the slot.

[Claim 6] The integrated fixture for welding of 5G SFP packaged optical transceiver modules according to claim 1, characterized in that: the optical device soldering portion includes a rear end located in the length direction of the working base. A welding abutment, the welding abutment is provided with at least one set of recessed positioning holes of the corresponding model, the center of the welding abutment is provided with an upper projection, and two sides of the welding abutment are respectively fixed with support rods The length direction of each support rod is arranged in parallel along the length direction of the working abutment, the cross section of each support rod is a right-angled triangle structure, and the right-angled side of the two support rods is arranged on the upper end surface. The oblique sides of the two support rods are arranged opposite to each other, so that the surfaces of the two support rods and the welding abutment form a bottom-up guide groove.

[Claim 7] The integrated fixture for welding a 5G SFP package optical transceiver module according to claim 1, characterized in that: the lower end of the front part of the working base is provided with a slot structure.

[Claim 8] A soldering method for soldering a 5G SFP packaged optical transceiver module, characterized in that: first, a PCB circuit board and a PCB flexible board are pre-fixed and pre-welded at a soldered portion of the flexible board, and then the said The semi-finished device and the optical device completed in the soldering part of the flexible board are welded into a complete 5G SFP package optical transceiver module device.

[Claim 9] The welding method for welding a 5G SFP package-type optical transceiver module according to claim 1, wherein the specific steps for manually soldering the flexible board are as follows:

1. Wear an anti-static bracelet, insert the bracelet into the grounding point of the workbench, and connect the bracelet with the ground of the workbench;

2. Turn on the soldering iron and check if the soldering iron is normal. Adjust the temperature of the electric iron to 360 ± 20 ° C and clean the tip of the electric iron when the iron is working normally;

3. After assembling the soft board to the PCB of the corresponding model, cut the pins to 2-6mm, press the soft board to the end with tweezers, and then solder with tin;

4. During the welding process, the solder joints need to be full and without tipping, and no virtual soldering;

5. Visually inspect the solder joints of the module for false soldering, missing soldering, short circuit, and tipping, and check the order of the pins. Welding mistakes, move to the next process with no errors.

[Claim 10] The welding method for welding a 5G SFP package-type optical transceiver module according to claim 1, wherein the specific steps of welding the product by welding the optical device are as follows:

1. After soldering the receiving component soft board and the transmitting component soft board to the PCB, the all-copper board faces up and the wiring faces face down;

2. Put the receiving module and the transmitting module on the flexible board respectively. The flexible board has the wiring side facing up for component welding;

3, the operator according to the plug-in principle: small first, then large, light first, then heavy, low first, then high, first inside and then outside into the corresponding pad hole on the PCB board, the PCB board into the tray to solder Process

4. Place the soldering iron tip on the pad of the part to be soldered to increase the temperature of the solder joint;

5. Use the solder wire to contact the soldering place, melt the proper amount of solder, and add the solder wire from the side of the soldering iron head;

6. After melting for 3 seconds from the beginning of the solder wire, remove the solder wire first, and then remove the electric soldering iron;

7. After the solder joints are cooled, use diagonal pliers to cut off the pins of the components. The length of the pins is determined according to the requirements of the structure drawing.