A long pin electrical connector repair method

Abstract

The present invention discloses a method for repairing a long-pin electrical connector, comprising: taking a product to be repaired; protecting the product to be repaired with thermal insulation tape and an anti-static bag; pre-treating and pre-heating the product to be repaired; removing the pre-treated and pre-heated product to be repaired from a repair workstation and installing it on a special tooling for a tin-spraying and desoldering station, heating it using the tin-spraying and desoldering station, and removing the long-pin electrical connector from a printed circuit board; removing excess solder from the printed circuit board pad; de-golding, tinning, installing, and soldering the removed long-pin electrical connector to complete the repair of the long-pin electrical connector; and cleaning and inspecting the repaired long-pin electrical connector. The present invention improves the preheating efficiency and preheating temperature by designing a special tooling for a tin-spraying and desoldering station, reduces the high-temperature heating time for repair to within 4 seconds, and reduces the number of pad heating times by optimizing the pad cleaning method, so as to meet the requirements for high-reliability repair of spacecraft electronic products and achieve high-reliability repair of long-pin electrical connectors.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic assembly, and in particular relates to a long-pin electrical connector repair method. Background Art

[0002] As spacecraft electronic products develop towards miniaturization, lightweight and low power consumption, printed circuit board electrical connectors have replaced the internal wires of traditional power products to achieve electrical connections between printed circuit boards. They are an important hub for internal interconnection of leadless chassis products.

[0003] Long-pin electrical connectors are widely used in aerospace electronics units, serving the vital function of transmitting energy and signals between components. These long-pin connectors are three-row, 206-pin plug-in components, with pins extending approximately 20mm from the printed circuit board. This presents the potential for repairs due to component defects or design issues. Testing using existing repair methods has shown a success rate of less than 80%, and the high-temperature heating time during the repair process exceeds 14 seconds. This makes repair consistency and product reliability uncertain, posing significant risks of internal delamination of the printed circuit board, pad detachment, and overheating and failure of surrounding components, which can directly impact product performance.

[0004] Due to the difficulty in rework of this type of long-pin electrical connector, there is currently no feasible process method that has been verified by application in the field of aerospace electronic assembly. It is urgent to explore rework methods and optimize key process parameters to shorten the rework heating time. At the same time, a large number of tests are needed to verify the reliability after rework and form a complete process method. Summary of the Invention

[0005] The technology of the present invention solves the problem: it overcomes the shortcomings of the existing technology, provides a long-pin electrical connector rework method, breaks through the limitation of the heating time of the existing rework method, and realizes high-reliability rework of long-pin electrical connectors. By designing special tooling for the tin spraying and desoldering station, improving the preheating efficiency, and increasing the preheating temperature, the high-temperature heating time for rework is reduced to within 4 seconds, and the number of pad heating times is reduced by optimizing the pad cleaning method to meet the requirements of high-reliability rework of spacecraft electronic products.

[0006] In order to solve the above technical problems, the present invention discloses a long-pin electrical connector repair method, comprising:

[0007] Take the product to be repaired; wherein the product to be repaired is: a whole formed by a long-pin electrical connector and a printed circuit board, and the long-pin electrical connector is welded to the printed circuit board;

[0008] Use thermal insulation tape and anti-static bags to protect the returned products;

[0009] Use chip retaining tongs and rework stations to pre-treat and pre-heat the products to be reworked;

[0010] Remove the pre-treated and pre-heated products to be reworked from the rework station and install them on the dedicated tooling for the tin spraying and desoldering station;

[0011] Use a tin-spray desoldering station to heat the product to be repaired, which is mounted on a dedicated tooling for the tin-spray desoldering station, and remove the long-pin electrical connector from the printed circuit board;

[0012] Use a vacuum pump desoldering pen to remove excess solder from the printed circuit board pads;

[0013] According to the long-pin electrical connector assembly method, the dismantled long-pin electrical connector is de-golded, tinned, installed, and welded to complete the repair of the long-pin electrical connector;

[0014] Remove the protective tape and anti-static bag and clean the repaired long-pin electrical connector;

[0015] Inspect the cleaned long-pin electrical connector.

[0016] In the above-mentioned long-pin electrical connector rework method, thermal insulation tape and anti-static bags are used to protect the product to be reworked, including:

[0017] Use 3 layers of thermal insulation tape to protect the area around the solder joints of the printed circuit board, including the component surface and the soldering surface;

[0018] Use an antistatic bag to protect the rest of the long-pin electrical connector printed circuit board. Attach antistatic tape to the cut edge of the bag and wrap the entire bag with thermal insulation tape.

[0019] In the above-mentioned long pin electrical connector rework method, a chip retaining pliers and a rework station are used to pre-treat and pre-heat the product to be reworked, including:

[0020] Use chip-retaining pliers to pre-process the reworked products: Use chip-retaining pliers to cut the long-pin electrical connector pins, and place a fixed thickness gasket at the bottom of the chip-retaining pliers;

[0021] Use the rework station to preheat the pre-treated product to be reworked: turn on the heater of the rework station and preheat the long-pin electrical connector body and solder joints at the same time.

[0022] In the above-mentioned long-pin electrical connector rework method, before the pre-treated and pre-heated product to be reworked is removed from the rework workstation and installed on the dedicated tooling of the tin spray desoldering station, a test board is used to perform positioning inspection.

[0023] In the above-mentioned long-pin electrical connector rework method, a tin-spray desoldering station is used to heat the product to be reworked, which is mounted on a dedicated tooling for the tin-spray desoldering station, and remove the long-pin electrical connector from the printed circuit board, including:

[0024] Use the tin spray desoldering station to perform three-post operations. Operator A holds the handle of the special tooling of the tin spray desoldering station to lift and lower it. Operator B wears heat-insulating gloves and waits to remove the long-pin electrical connector. Operator C uses a hot air gun for auxiliary heating throughout the process, and the hot air gun temperature is set to 180°C. When the heating time reaches 3 seconds, operator B removes the long-pin electrical connector from the printed circuit board. After removing the long-pin electrical connector from the printed circuit board, operator A lifts the handle of the special tooling of the tin spray desoldering station to end the heating, ensuring that the time is controlled within 4 seconds.

[0025] In the above-mentioned long-pin electrical connector rework method, cleaning the reworked long-pin electrical connector includes:

[0026] Clean the solder joints of the reworked long-pin electrical connector: Place the reworked long-pin electrical connector at an angle in an anti-static box and use an anti-static brush dipped in anhydrous ethanol to clean the solder joints.

[0027] Clean the inside of the socket of the repaired long-pin electrical connector: Use a syringe to inject anhydrous ethanol into the socket to clean the inside of the socket.

[0028] In the above-mentioned long-pin electrical connector rework method, the cleaned long-pin electrical connector is inspected, including: using a 30x magnifying glass to inspect the components within a 10mm range around the cleaned long-pin electrical connector, and using an X-ray machine to inspect the tin penetration and excess materials in the solder holes of the cleaned long-pin electrical connector.

[0029] In the above-mentioned long-pin electrical connector rework method, when using thermal insulation tape to protect the product to be reworked, the thermal insulation tape is applied to all components within 30 mm from the front and back of the printed circuit board to prevent direct contact of high-temperature tin liquid with non-rework areas and other components when using a tin spray desoldering station.

[0030] In the above-mentioned long pin electrical connector repair method,

[0031] The pins that need to be cut are those that extend more than 1mm beyond the solder joint. Use a gasket of fixed thickness under the chip-retaining pliers to ensure that the pins are of consistent length after cutting.

[0032] The rework station has three levels of heaters: a top heater, a bottom whole-board preheater, and a bottom local heater, and has built-in temperature monitoring for the rework area. The hot air head used by the top heater completely covers the electrical connector, and the top heater performs local closed heating when heating, so that the rework area reaches 110°C after preheating to shorten the temperature difference with the melting temperature of the solder.

[0033] In the above-mentioned long-pin electrical connector rework method, a dedicated tooling for a tin-spraying and desoldering station includes: a moving frame, a base frame, a connecting rod, a height adjuster, a width adjuster, a clamping device, and a handle;

[0034] The base frame is fixed to the tin spray desoldering station through threads, ensuring that the special tooling of the tin spray desoldering station is fixed to the tin spray desoldering station as a whole, and the structure is stable;

[0035] The mobile frame and the base frame are connected by a connecting rod. Both ends of the connecting rod can rotate around the rotation axis installed on the mobile frame and the base frame, so that the mobile frame can rotate and translate while maintaining a horizontal state. Among them, the pre-treated and pre-heated products to be reworked removed from the rework station are installed on the mobile frame.

[0036] The height adjuster is installed on the mobile frame and is used to adjust the height of the pre-treated and pre-heated products to be reworked on the mobile frame, thereby achieving the distance between the products to be reworked and the nozzle of the tin spraying and desoldering station;

[0037] The width adjuster is installed on the mobile frame and can slide along the mobile frame in the width direction to adjust the clamping width of the pre-treated and pre-heated products to be reworked on the mobile frame;

[0038] The pressing device is installed on the mobile frame and can slide along the length direction of the mobile frame to press the pre-treated and pre-heated products to be repaired on the mobile frame;

[0039] The handle is mounted on the mobile frame by screws, making it easy for users to operate.

[0040] The present invention has the following advantages:

[0041] (1) The present invention discloses a rework method for long-pin electrical connectors. By designing a special tooling for a tin-spraying and desoldering station, the preheating efficiency and preheating temperature are improved, and the high-temperature heating time for rework is reduced to within 4 seconds. The pad cleaning method is optimized to reduce the number of pad heating times, so as to meet the requirements of high-reliability rework of spacecraft electronic products. This method breaks through the limitation of the heating time of existing rework methods and realizes high-reliability rework of long-pin electrical connectors. The method is suitable for high-reliability rework of electrical connectors on printed circuit boards of aerospace electronic products and can be extended to the rework of all high-density plug-in components.

[0042] (2) The present invention discloses a method for repairing a long-pin electrical connector, which cuts the pins of the long-pin electrical connector and allows it to be removed from the printed circuit board more conveniently than an electrical connector whose pins are not cut. The method of using a fixed gasket to control the length of the cut pins with a chip-retaining pliers can ensure that the length after cutting is consistent and control the direction of the cutting force, without causing damage to the solder holes of the printed circuit board pads during the cutting process and the repair and removal process.

[0043] (3) The present invention discloses a rework method for long-pin electrical connectors, which uses a rework station for preheating. Compared with traditional preheating methods, it is more efficient and can achieve a higher preheating temperature. The rework station has multiple heating components and a built-in temperature zone monitoring system that can monitor and control the rework preheating temperature in real time. It can also achieve closed heating, with a faster heating rate than traditional hot air preheating stations or hot air guns. It can also increase the preheating temperature from 70°C to 110°C, greatly reducing the temperature difference with the melting point of the solder.

[0044] (4) The present invention discloses a method for repairing long-pin electrical connectors, and designs a special tooling for a tin-spraying and desoldering station. The use of the special tooling for positioning and clamping has higher repeatability and better stability than the traditional handheld method, and solves the problem that the key equipment is too dependent on the operator's skills and there is a risk of overheating and damage to the product due to misoperation.

[0045] (5) The present invention discloses a method for repairing a long-pin electrical connector, which uses a vacuum desoldering pen to clean the solder pad after repair. Compared with the traditional desoldering rope removal method, the method has fewer heating times, higher cleaning efficiency, less damage to the solder pad, and is less likely to leave excess metal residue.

[0046] (6) The present invention discloses a rework method for long-pin electrical connectors, which has achieved a 100% rework success rate through 40 application verifications, shortening the high-temperature tin liquid heating time from 14 seconds to 4 seconds. Through microscopic inspection, metallographic inspection, high and low temperature cycle testing, microscopic sectioning, simulated rework, interconnect resistance test verification, and real-time temperature measurement of the heat-affected zone, it is proved that its rework reliability meets aerospace standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a flowchart of the steps of a long pin electrical connector repair method according to an embodiment of the present invention;

[0048] Figure 2 It is a structural schematic diagram of a special tooling for a tin spraying and desoldering station according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be described in further detail below with reference to the accompanying drawings.

[0050] like Figure 1 In this embodiment, the long pin electrical connector rework method includes:

[0051] Step 0: Get the product to be repaired.

[0052] In this embodiment, the product to be repaired specifically refers to: an integral body formed by a long-pin electrical connector and a printed circuit board; wherein the long-pin electrical connector is welded to the printed circuit board.

[0053] Step 1: Use thermal insulation tape and anti-static bags to protect the product to be repaired.

[0054] In this embodiment, three layers of thermal insulation tape are used to protect the area around the printed circuit board solder joints (including the component surface and the soldering surface). Meanwhile, an antistatic bag is used to protect the rest of the long-pin electrical connector printed circuit board. The antistatic tape is applied to the cut edge of the antistatic bag, and the thermal insulation tape is wrapped around the entire bag.

[0055] Preferably, when using thermal insulation tape to protect the product to be repaired, the thermal insulation tape should be applied to all components within 30 mm from the front and back of the printed circuit board, so as to avoid direct contact between the high-temperature tin liquid and the non-repair area and other components when using the tin spray desoldering station.

[0056] Step 2: Use chip pliers to pre-process the product to be repaired.

[0057] In this embodiment, the use of chip pliers to pre-process the product to be repaired primarily involves shearing long electrical connector pins. The pins to be sheared are those that extend more than 1mm beyond the solder joint. A fixed-thickness shim is placed under the chip pliers to ensure consistent pin length after shearing.

[0058] Step 3: Use the rework station to preheat the pre-treated product to be reworked.

[0059] In this embodiment, the rework station heater is turned on to preheat the long-pin electrical connector body and solder joints simultaneously. The rework station has three heater stages: a top heater, a bottom full-board preheater, and a bottom local heater. The station also includes built-in temperature monitoring for the rework area. The top heater uses a hot air head that completely covers the electrical connector. The top heater provides localized, closed heating, ensuring the rework area reaches 110°C after preheating, minimizing the temperature difference from the solder melting point (183°C).

[0060] Step 4: Remove the pre-treated and pre-heated product to be reworked from the rework station and install it on the dedicated tooling for the tin spray desoldering station. Use a test board to check the positioning before installation.

[0061] In this embodiment, if Figure 2The special tooling for the tin-spray desoldering station can specifically include: a mobile frame 1, a base frame 2, a connecting rod 3, a height adjuster 4, a width adjuster 5, a clamping device 6 and a handle 7. Among them, the base frame 2 is fixed to the tin-spray desoldering station by threads to ensure that the special tooling for the tin-spray desoldering station is fixed to the tin-spray desoldering station as a whole, and the structure is stable. The mobile frame 1 and the base frame 2 are connected by a connecting rod 3. Both ends of the connecting rod 3 can rotate around the rotation axis installed on the mobile frame 1 and the base frame 2, so that the mobile frame 1 can maintain a horizontal state for rotation and translation. The height adjuster 4 is installed on the mobile frame 1, and is used to adjust the height of the pre-treated and pre-heated product to be reworked on the mobile frame 1, thereby realizing the distance between the product to be reworked and the nozzle of the tin-spray desoldering station. The width adjuster 5 is installed on the mobile frame 1, and can slide along the mobile frame 1 in the width direction, and is used to adjust the clamping width of the pre-treated and pre-heated product to be reworked on the mobile frame 1. The clamping device 6 is mounted on the mobile frame 1 and can slide along the length of the mobile frame 1 to clamp the pre-treated and pre-heated products to be repaired on the mobile frame 1. The handle 7 is screwed to the mobile frame 1 for easy operation.

[0062] Preferably, the pre-treated and pre-heated product to be reworked, removed from the rework station, is mounted on the mobile frame 1. The connecting rod is raised / lowered by gripping the handle 7 to bring the solder joints into contact with the high-temperature tin solution and to complete the rework. The product to be reworked is secured using a dedicated fixture for the tin spray and desoldering station, allowing precise positioning of the rework area, reducing manual errors and ensuring that the high-temperature tin solution contacts all pins and is evenly preheated.

[0063] Step 5: Use a tin-spray desoldering station to heat the product to be repaired, which is mounted on a dedicated tooling for the tin-spray desoldering station, and remove the long-pin electrical connector from the printed circuit board.

[0064] In this embodiment, a tin spray desoldering station is used to perform three-post operations: operator A holds the handle of the special tooling of the tin spray desoldering station to lift and lower it, operator B wears heat-insulating gloves and waits to remove the long-pin electrical connector, and operator C uses a hot air gun for auxiliary heating throughout the process, and the hot air gun temperature is set to 180°C; when the heating time reaches 3 seconds, operator B removes the long-pin electrical connector from the printed circuit board; after removing the long-pin electrical connector from the printed circuit board, operator A lifts the handle of the special tooling of the tin spray desoldering station to end the heating, ensuring that the time is controlled within 4 seconds.

[0065] Step 6: Use a vacuum pump to remove excess solder from the PCB pads, and control the number of pad heating times to 1 to 2 times.

[0066] Step 7: De-gold, tin, install, and weld the dismantled long-pin electrical connector according to the long-pin electrical connector assembly method to complete the repair of the long-pin electrical connector.

[0067] Step 8: Remove the protective tape and anti-static bag and clean the repaired long-pin electrical connector.

[0068] In this embodiment, the cleaning of the reworked long-pin electrical connector mainly includes:

[0069] 81) Clean the solder joints of the repaired long-pin electrical connector: Place the repaired long-pin electrical connector at an angle in an anti-static box, and use an anti-static brush dipped in anhydrous ethanol to clean the solder joints.

[0070] 82) Clean the inside of the socket of the repaired long-pin electrical connector: Use a syringe to inject anhydrous ethanol into the socket to clean the inside of the socket.

[0071] Step 9: Inspect the cleaned long-pin electrical connector.

[0072] In this embodiment, a 30x magnifying glass can be used to inspect components within a 10 mm range around the cleaned long-pin electrical connector, and an X-ray machine can be used to inspect the tin penetration and excess materials in the solder holes of the cleaned long-pin electrical connector.

[0073] Based on the above embodiment, a specific example is given below for explanation.

[0074] Many factors affect the reliability of long-pin electrical connector rework, including damage to the pads and printed circuit board (PCB) caused by prolonged heating of high-temperature solder, damage to other components on the PCB through heat conduction, and damage to the inner walls of the solder holes during component removal. This invention discloses a long-pin electrical connector rework method, which primarily involves the following steps: removing excess material from the PCB and protecting it from heat, shearing off excess long-pin pins, preheating the rework station, installing it on a dedicated tooling for a tin-spray desoldering station, removing the tin-spray desoldering station, removing excess solder from the pads with a vacuum desoldering pen, inspecting the pads with a microscope, restoring the replaced long-pin electrical connector, and inspecting the soldering quality using a microscope and X-rays.

[0075] (1) Special tooling for tin spraying and desoldering station

[0076] The dedicated fixture for the tin-spray desoldering station is suitable for installing printed circuit board assemblies with various sizes and mounting holes. Before installation, the fixture must be assembled and secured to the tin-spray desoldering station. Before rework, a test board identical to the production product is used for alignment. The tin-spraying port on the tin-spray desoldering station, installed in a fixed position, is precisely aligned with the tin-spraying port. The port covers all long-pin electrical connector pins, and the tin-spraying port is confirmed to be centered using the tin-spraying desoldering station's built-in infrared locator.

[0077] (2) Preheating of the rework station

[0078] Use the rework workstation for preheating. Cover the entire long-pin electrical connector with the upwind installation and preheat the solder joints with the downwind installation. Use insulation tape and anti-static bags to protect the remaining parts. Verify the preheating temperature curve with a test board. After preheating, the temperature in the rework area reaches about 110°C.

[0079] (3) Printed circuit board reliability verification

[0080] The rework method was carried out on the test board, and the reliability of the rework method was verified through a verification process of real-time temperature measurement, microscopy, metallographic sectioning, ring test, and simulated rework: real-time temperature measurement was performed on thermal stress-sensitive components around the rework area of ​​the printed circuit board to verify that the temperature increase and heating rate caused by normal rework did not affect the components and solder joints on the printed circuit board; a 30x microscope was used for visual inspection and metallographic sectioning of the solder holes to inspect the inner electrical layer, and no delamination or cracks were found, and the inner wall of the solder hole was intact; after replacing the long-pin electrical connector, 200 temperature cycle tests were performed, and no abnormal changes were found in the electrical performance before and after rework; a simulated rework was performed on the test board with the electrical connector removed, and the soldering iron was set to a temperature of 280℃ (the same as the high-temperature tin liquid during rework) and a heating time of 6 seconds for 5 cycles of simulated rework. The impedance change rate before and after rework was less than 2%.

[0081] Although the present invention has been disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solutions of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the scope of protection of the technical solutions of the present invention.

[0082] The contents not described in detail in the specification of the present invention belong to the common knowledge of professionals in this field.

Claims

1. A long pin electrical connector repair method, characterized in that: include: Take the product to be repaired; wherein the product to be repaired is: a whole formed by a long-pin electrical connector and a printed circuit board, and the long-pin electrical connector is welded to the printed circuit board; Use thermal insulation tape and anti-static bags to protect the returned products; Use chip retaining tongs and rework stations to pre-treat and pre-heat the products to be reworked; The product to be reworked after pretreatment and preheating is removed from the rework station and installed on the special tooling of the tin spray desoldering station; wherein, the special tooling of the tin spray desoldering station comprises: a mobile frame (1), a base frame (2), a connecting rod (3), a height adjuster (4), a width adjuster (5), a clamping device (6) and a handle (7); the base frame (2) is fixed to the tin spray desoldering station by screw threads, so as to ensure that the special tooling of the tin spray desoldering station and the tin spray desoldering station are fixed as one body and the structure is stable; the mobile frame (1) and the base frame (2) are connected by a connecting rod (3), and both ends of the connecting rod (3) can rotate around the rotating shaft installed on the mobile frame (1) and the base frame (2), so that the mobile frame (1) can be kept in a horizontal state for rotation and translation; the product to be reworked after pretreatment and preheating is removed from the rework station The product is mounted on the mobile frame (1); a height adjuster (4) is mounted on the mobile frame (1) and is used to adjust the height of the product to be repaired after being pretreated and preheated on the mobile frame (1), thereby achieving a distance between the product to be repaired and the nozzle of the tin spraying and desoldering station; a width adjuster (5) is mounted on the mobile frame (1) and can slide along the mobile frame (1) in the width direction and is used to adjust the clamping width of the product to be repaired after being pretreated and preheated on the mobile frame (1); a pressing device (6) is mounted on the mobile frame (1) and can slide along the mobile frame (1) in the length direction and is used to press the product to be repaired after being pretreated and preheated on the mobile frame (1); a handle (7) is mounted on the mobile frame (1) by screws to facilitate operation by an operator; Use a tin-spray desoldering station to heat the product to be reworked, which is mounted on the station's dedicated tooling, and remove the long-pin electrical connector from the printed circuit board. This includes: Using the tin-spray desoldering station for a three-position operation, operator A holds the handle of the tin-spray desoldering station's dedicated tooling to lift and lower it, operator B wears heat-insulating gloves while waiting to remove the long-pin electrical connector, and operator C uses a hot air gun for auxiliary heating throughout the process, with the hot air gun set to 180°C. When the heating time reaches 3 seconds, operator B removes the long-pin electrical connector from the printed circuit board. After removing the long-pin electrical connector from the printed circuit board, operator A lifts the handle of the tin-spray desoldering station's dedicated tooling to end the heating process, ensuring that the heating time is controlled within 4 seconds. Use a vacuum pump desoldering pen to remove excess solder from the printed circuit board pads; According to the long-pin electrical connector assembly method, the dismantled long-pin electrical connector is de-golded, tinned, installed, and welded to complete the repair of the long-pin electrical connector; Remove the protective tape and anti-static bag and clean the repaired long-pin electrical connector; Inspect the cleaned long-pin electrical connector.

2. The long pin electrical connector repair method according to claim 1, characterized in that: Use thermal insulation tape and anti-static bags to protect the returned product, including: Use 3 layers of thermal insulation tape to protect the area around the solder joints of the printed circuit board, including the component surface and the soldering surface; Use an antistatic bag to protect the rest of the long-pin electrical connector printed circuit board. Attach antistatic tape to the cut edge of the bag and wrap the entire bag with thermal insulation tape.

3. The long pin electrical connector repair method according to claim 1, characterized in that: Use chip tongs and rework stations to pre-treat and pre-heat the product to be reworked, including: Use chip-retaining pliers to pre-process the reworked products: Use chip-retaining pliers to cut the long-pin electrical connector pins, and place a fixed thickness gasket at the bottom of the chip-retaining pliers; Use the rework station to preheat the pre-treated product to be reworked: turn on the heater of the rework station and preheat the long-pin electrical connector body and solder joints at the same time.

4. The long pin electrical connector repair method according to claim 1, wherein: Before removing the pre-treated and pre-heated product to be reworked from the rework station and installing it on the dedicated tooling for the tin spray desoldering station, a test board is used to perform a positioning check.

5. The long pin electrical connector rework method according to claim 1, characterized in that: Clean the reworked long pin electrical connector, including: Clean the solder joints of the reworked long-pin electrical connector: Place the reworked long-pin electrical connector at an angle in an anti-static box and use an anti-static brush dipped in anhydrous ethanol to clean the solder joints. Clean the inside of the socket of the repaired long-pin electrical connector: Use a syringe to inject anhydrous ethanol into the socket to clean the inside of the socket.

6. The long pin electrical connector repair method according to claim 1, characterized in that: Inspect the cleaned long-pin electrical connector, including: using a 30x magnifying glass to inspect the components within 10mm around the cleaned long-pin electrical connector, and using an X-ray machine to inspect the tin penetration and excess materials in the solder holes of the cleaned long-pin electrical connector.

7. The long pin electrical connector repair method according to claim 2, characterized in that: When using thermal insulation tape to protect the product to be repaired, the thermal insulation tape should be applied to all components within 30mm from the front and back of the printed circuit board to prevent the high-temperature tin liquid from directly contacting the non-rework area and other components when using the tin spray desoldering station.

8. The long pin electrical connector repair method according to claim 3, characterized in that: The pins that need to be cut are those that extend more than 1mm beyond the solder joint. Use a gasket of fixed thickness under the chip-retaining pliers to ensure that the pins are of consistent length after cutting. The rework station has three levels of heaters: a top heater, a bottom whole-board preheater, and a bottom local heater, and has built-in temperature monitoring for the rework area. The hot air head used by the top heater completely covers the electrical connector, and the top heater performs local closed heating when heating, so that the rework area reaches 110°C after preheating to shorten the temperature difference with the melting temperature of the solder.

Images