Testing device for circuit board processing

Abstract

The invention discloses a testing device for circuit board processing. The testing device comprises a circuit board jig feeding mechanism, a circuit board detecting and conveying mechanism, a testing mechanism and a circuit board testing jig. The circuit board jig feeding mechanism comprises a conveying belt and two jig guide pipes; the circuit board detecting and conveying mechanism comprises two parallel lead screw rails and a double-shaft motor; the testing mechanism comprises a testing installation box, a tester installed in the testing installation box, four installation frames and two sliding rods. The jig for testing the circuit board comprises a jig block, an identification tag and an alignment tag. According to the device, a jig loaded with a circuit board is conveyed to the lead screw guide rail in the guide rail direction and conveyed to the position below the tester through the lead screw guide rail, an alignment label is recognized through the aligner, the error can be accurately controlled to be smaller than 1 mm, error-free alignment can be achieved through downward movement of the alignment air cylinder arranged in an accurate alignment mode, and after testing is completed, the jig can be automatically pushed out; and code spraying identification is carried out on the abnormal circuit board, thereby facilitating subsequent processing.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit board testing, and in particular to a testing device for processing circuit boards. Background Art

[0002] With the development of science and technology, electronic products have also developed rapidly. Electronic products all have circuit boards, and circuit boards need to be made by welding. When the circuit boards are welded, there will be a certain amount of welding slag connected with the electronic components, which can easily cause a short circuit on the circuit board. Therefore, it is necessary to detect the circuit board. The traditional detection of circuit boards mainly relies on manual observation with the naked eye to judge whether the metal circuit is qualified. When using equipment for continuous detection, the transportation of circuit boards is a difficult point. How to accurately transport the jigs for the circuit boards to the detection points and how to accurately connect the detection equipment to the pins on the circuit boards for automated testing are relatively difficult. The existing conveyor belt is used for transportation. The jigs on the conveyor belt will be affected by the flipping position when the conveyor belt is flipped, and it is difficult to flip. The general transportation does not perform automatic correction when it is transported to the test position to achieve the best alignment for testing. Therefore, sometimes the test fails because the pins of the circuit board cannot be accurately aligned. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, one purpose of the present invention is to provide a circuit board processing test device to solve the problems of low circuit board test progress and difficulty in continuous testing.

[0004] A circuit board processing test device according to the present invention comprises a circuit board fixture feeding mechanism, a circuit board detection and conveying mechanism, a testing mechanism and a circuit board testing fixture; The circuit board jig feeding mechanism includes a conveyor belt and two jig guide tubes, the two jig guide tubes are provided with downwardly inclined curved tubes near both ends and the lower half of the curved tubes is cut off, the lower part of the middle part of the curved tubes is supported by a support rod, and the two jig guide tubes are arranged in parallel above the conveyor belt and do not contact the conveyor belt; The circuit board detection and transportation mechanism includes two parallel screw rails and a double-axis motor, a rotating shaft is provided at both ends of the screw rail and bearings are sleeved on the rotating shafts at both ends, the bearings are sleeved and fixed by the top end of the mounting rod, the top end of the mounting rod is semicircular and the width of the mounting rod is smaller than the diameter of the screw rail, the top end of the mounting rod is lower than the top of the screw rail, the ends of the rotating shafts on the same side of the two screw rails are sleeved with driven bevel gear plates, the rotating shafts at both ends of the double-axis motor are sleeved with an active bevel gear plate respectively, the two active bevel gear plates are respectively meshed with the corresponding driven bevel gear plates, the bent pipes at the output ends of the two jig guide tubes are correspondingly connected with the input ends of the screw rails and the bent pipes are sleeved above the top end of the mounting rod; The testing mechanism comprises a testing installation box, a tester installed in the testing installation box, four mounting frames and two sliding rods, the four mounting frames are symmetrically arranged in pairs and installed on the outsides of the two screw rails, a sliding rod is connected between the top ends of the mounting frames on the same side, the testing installation box is movably sleeved on the corresponding sliding rods near the top ends on both sides, a mounting slot is provided at the middle position of the bottom of the testing installation box, four limiting rods are provided at the four corner positions in the mounting slot, and the four corner positions of the tester are movably sleeved on the four limiting rods, a push-down motor is provided at the middle position of the bottom of the mounting slot, and a push-down screw is connected to the rotating shaft of the push-down motor, the push-down screw is spirally inserted into the center position of the top of the tester, a plurality of pin docking joints are provided at the bottom of the tester, a label identifier is provided at the top of the left side wall of the testing installation box, an aligner is provided at the middle position of the bottom of the testing installation box near the two side edges, a connecting rod is provided between the two mounting frames on the rear side, a servo motor is provided on the connecting rod, a fine-tuning screw is connected to the rotating shaft of the servo motor, and the fine-tuning screw is spirally inserted into the side wall of the testing installation box; The circuit board testing jig comprises a jig block, an identification label and an alignment label. A square card slot is provided in the middle of the jig block, a hollow square hole is provided in the middle of the square card slot, a square rubber edge is attached to the side wall of the square card slot, an identification label is provided on the upper surface of the front and rear sides of the square card slot, an alignment label is provided on the middle position of the left and right sides of the square card slot, two parallel long strip bayonet ports are provided on the lower surface of the jig block, the upper half of the long strip bayonet port is semi-cylindrical and the lower half is a square strip, and the semi-cylindrical inner wall of the long strip bayonet port is provided with a thread matching the screw track.

[0005] In some embodiments of the present invention, the diameter of the jig conduit is / of the diameter of the screw track, and the jig conduit does not contact the inner wall of the semi-cylindrical portion of the long strip bayonet in the section above the conveyor belt.

[0006] In some other embodiments of the present invention, the output ends of the two screw rails are connected to corresponding output rails, and the rear half of the output rails is provided with a descending rail.

[0007] In some other embodiments of the present invention, ventilation elbows are provided on the left and right side walls of the test installation box, the output end of the ventilation elbow faces below the tester, and a hair dryer is provided in the ventilation elbow.

[0008] In some other embodiments of the present invention, the jig block is provided with positioning holes near the four corners of the square slot, and four positioning cylinders are embedded in the bottom of the test installation box. The end of the cylinder shaft of the positioning cylinder is conical, and the cylinder shaft of the positioning cylinder is provided with a pressing plate above the cone. After the cylinder shaft of the positioning cylinder is inserted into the positioning hole, the pressing plate just presses on the corner of the circuit board.

[0009] In some other embodiments of the present invention, the depth of the square slot is / of the thickness of the circuit board, and a positioning column is provided on the square rubber edge fan, and the positioning column corresponds to the positioning socket at the edge of the circuit board.

[0010] In some other embodiments of the present invention, a jig detection block is provided under the two curved pipes at the output end of the jig conduit. When the jig block slides down from the curved pipe and abuts against the end of the screw rail, the jig detection block detects the presence of the jig block. At this time, the conveyor belt is started to stop conveying. After the circuit board on the previous jig block is tested, the dual-axis motor is started to continue to operate, driving the jig block in contact with the end of the screw rail to be transported to the screw rail for testing, and at the same time, the conveyor belt is started to continue conveying the jig block.

[0011] In some other embodiments of the present invention, the length of the screw rail is not less than the sum of the widths of the three fixture blocks.

[0012] In some other embodiments of the present invention, the tester is provided with a spray terminal, and when the tester detects an abnormality in an abnormal circuit board, an abnormal identification code is sprayed onto the circuit board.

[0013] In the present invention, the jig loaded with the circuit board is transported along the guide rail direction to the screw guide rail, and then transported to the bottom of the tester through the screw guide rail. The alignment label is identified by the aligner, and the error can be accurately controlled to be less than 1 mm. The alignment cylinder set by the precise alignment can also be moved down to achieve error-free alignment, so that the pin docking test can be more accurate. After the test is completed, the jig can be automatically pushed out and the abnormal circuit board can be marked with a code to facilitate subsequent processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 The present invention is a schematic structural diagram of a circuit board processing testing device.

[0015] Figure 2 for Figure 1 Enlarged structural diagram at A in the middle.

[0016] Figure 3 This is a schematic diagram of the overall cross-sectional structure of the test installation box proposed by the present invention.

[0017] Figure 4 This is a schematic diagram of the cross-sectional structure of the test installation box proposed by the present invention when it is aligned with the cylinder.

[0018] Figure 5 The figure is a schematic diagram of the structure of the circuit board testing fixture proposed by the present invention.

[0019] In the figure: 1. conveyor belt; 2. fixture guide tube; 21. elbow; 3. dual-axis motor; 31. active bevel gear plate; 4. screw track; 41. rotating shaft; 411. bearing; 412. mounting rod; 42. driven bevel gear plate; 5. test installation box; 50. ventilation elbow; 501. hair dryer; 51. label identifier; 52. aligner; 53. positioning cylinder; 531. conical head; 532. pressing piece; 6. mounting frame; 61. sliding rod; 7. servo motor; 71. fine-tuning screw; 8. output track; 81. downward slide track; 9. fixture block; 91. long bayonet; 92. square slot; 921. square rubber edge; 93. identification label; 94. alignment label; 95. hollow square hole; 96. positioning hole; 10. tester; 101. push-down motor; 102. limit rod; 103. pin docking joint. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] like Figure 1-5 As shown, a circuit board processing test device proposed by the present invention includes a circuit board fixture feeding mechanism, a circuit board detection and conveying mechanism, a testing mechanism and a circuit board test fixture; The circuit board jig feeding mechanism comprises a conveyor belt 1 and two jig guide tubes 2. The two jig guide tubes 2 are provided with downwardly inclined curved tubes 21 near both ends, and the lower half of the curved tubes 21 is cut off. The curved tubes 21 are supported by a support rod below the middle position. The two jig guide tubes 2 are arranged in parallel above the conveyor belt 1 and do not contact the conveyor belt 1. The fixture guide tube 2 is smooth, which is convenient for the fixture block to slide on it. When on the conveyor belt 1, the fixture guide tube 2 is not pressed, but is limited by the fixture guide tube 2 to slide. The bending range of the elbow 21 is less than 30° downward. During the sliding process, the rear fixture block pushes the front one to slide down. The circuit board detection and transportation mechanism includes two parallel screw rails 4 and a dual-axis motor 3. The screw rails 4 are provided with rotating shafts 41 at both ends and bearings 411 are sleeved on the rotating shafts 41 at both ends. The bearings 411 are sleeved and fixed with the top of the mounting rod 412. The top of the mounting rod 412 is semicircular and the width of the mounting rod 412 is smaller than the diameter of the screw rail 4. The top of the mounting rod 412 is lower than the top of the screw rail 4. The ends of the rotating shafts 41 of the two screw rails 4 on the same side are sleeved with driven bevel gear discs 42. The rotating shafts at both ends of the dual-axis motor 3 are respectively sleeved with an active bevel gear disc 31. The two active bevel gear discs 31 are respectively meshed with the corresponding driven bevel gear discs 42. The bent pipes 21 at the output ends of the two jig guide tubes 2 are correspondingly connected with the input ends of the screw rails 4 and the bent pipes 21 are sleeved above the top of the mounting rod 412. like Figure 2 There is a gap of about 2mm between the elbow 21 and the screw rail 4, and the bottom of the elbow 21 is about 1mm higher than the screw rail 4. When the fixture block is on the screw rail 4 under the slide, part of the screw rail 4 threads will be connected with the inner threads of the long bayonet 91 of the fixture block 9, and the rotating screw rail 4 will slowly pull the fixture block 9 onto the screw rail 4 to achieve complete thread engagement to achieve the subsequent transportation; the two parallel screw rails 4 have opposite threads, so as to achieve synchronous pushing, and the thread settings are to achieve the synchronous pushing of the two screw rails 4 on both sides of the fixture block 9; The test mechanism includes a test installation box 5, a tester 10 installed in the test installation box 5, four mounting frames 6 and two slide bars 61. The four mounting frames 6 are symmetrically arranged in pairs and installed on the outside of the two screw rails 4. The slide bars 61 are connected between the top ends of the mounting frames 6 on the same side. The top positions of the test installation box 5 near the two sides are movably sleeved on the corresponding slide bars 61. The middle position of the bottom of the test installation box 5 is provided with a mounting groove, and four limiting rods 102 are provided at the four corner positions in the mounting groove. The four corner positions of the tester 10 are movably sleeved on the four limiting rods 102. The middle position of the bottom of the mounting groove A push-down motor 101 is provided and a push-down screw is connected to the rotating shaft of the push-down motor 101, the push-down screw is spirally inserted into the center position of the top of the tester 10, a plurality of pin docking joints 103 are provided at the bottom of the tester 10, a label identifier 51 is provided at the top of the left side wall of the test installation box 5, an aligner 52 is provided at the middle position of the bottom near the two side edges of the test installation box 5, a connecting rod is provided between the two mounting frames on the rear side, a servo motor is provided on the connecting rod, a fine-tuning screw 71 is connected to the rotating shaft of the servo motor 7, and the fine-tuning screw 71 is spirally inserted into the side wall of the test installation box 5; The tester 10 is an existing tester. After the pins are docked, the test is performed. The label identifier 51 (a barcode scanner or other laser identification device) first identifies the first identification label 93 on the rear side, and the surface fixture block enters the test point and continues to push slowly. When the second identification label 93 is detected, the surface fixture block 9 completely enters the bottom of the tester (but still needs to be aligned, but the screw track 4 stops rotating). At this time, the servo motor 7 drives the fine adjustment screw 71 to rotate slowly and push back and forth so that the aligner 52 is aligned with the alignment label 94. At this time, the downward movement test can basically be performed (a full alignment method is set later). The downward moving tester 10 docks the pin docking joint 103 to the pin for testing. After the test is completed, the tester is pulled up to transport the fixture block 9 for the next test. The circuit board testing jig includes a jig block 9, an identification label 93 and an alignment label 94. A square card slot 92 is provided in the middle of the jig block 9, a hollow square hole 95 is provided in the middle of the square card slot 92, and a square rubber edge 921 is attached to the side wall of the square card slot 92. The jig block 9 is provided with an identification label 93 on the upper surface of the front and rear sides of the square card slot 92, and an alignment label 94 is provided in the middle position of the left and right sides of the square card slot 92. Two parallel long strip bayonet holes 91 are provided on the lower surface of the jig block 9. The upper half of the long strip bayonet hole 91 is semi-cylindrical and the lower half is a square strip. The semi-cylindrical inner wall of the long strip bayonet hole 91 is provided with a thread matching the screw track 4.

[0022] The hollow square hole 95 is designed to facilitate the removal of the circuit board later without buckling the circuit board. The square rubber edge 921 can squeeze the edge of the circuit board to prevent shaking during the movement or difficulty in alignment during testing. If it is stuck, it will be inconvenient to remove it later. The square strip shape has a certain depth of the bayonet, and it is not easy to detach during the movement process. The diameter of the jig conduit 2 is 4 / 5 of the diameter of the screw track 4, and the jig conduit 2 does not contact the inner wall of the semi-cylindrical portion of the long bayonet 91 in the section above the conveyor belt 1. This facilitates the smooth docking of the long bayonet 91 of the jig block 9 to the screw track 4 without affecting the sliding of the jig block 9 on the jig conduit 2.

[0023] The output ends of the two screw rails 4 are connected to the output rails 8, and the rear half of the output rails 8 is provided with a downward slide rail 81. After being pushed onto the output rails 8, it stays for a while and then automatically slides down the downward slide rail 81 after being pushed by the back, waiting for the circuit board to be taken out later.

[0024] The left and right side walls of the test installation box 5 are provided with ventilation elbows 50, the output end of which faces the bottom of the tester 10, and a blower 501 is provided in the ventilation elbow 50. During the test, the heat is dissipated by blowing to prevent the temperature from rising during the test and causing damage to the circuit board.

[0025] The jig block 9 is provided with positioning holes 96 at the four corners near the square slot 92, and four positioning cylinders 53 are embedded in the bottom of the test installation box 5. The cylinder shaft end of the positioning cylinder 53 is conical, and the cylinder shaft of the positioning cylinder 53 is sleeved with a pressing piece 532 above the cone. After the cylinder shaft of the positioning cylinder 53 is inserted into the positioning hole 96, the pressing piece 532 just presses on the corner of the circuit board.

[0026] In order to further accurately align, the cylinder shaft of the positioning cylinder 53 can be inserted into the positioning hole 96 to achieve accurate positioning, and then the pressing piece 532 is used to press on the circuit board to facilitate testing and fixing.

[0027] The depth of the square slot 92 is 2 / 3 of the thickness of the circuit board, and the square edge fan is provided with a positioning column 922, which corresponds to the positioning slot at the edge of the circuit board, so as to prevent the circuit board from being placed in the wrong direction or misplaced, and facilitate testing without error.

[0028] The jig guide tube 2 is provided with a jig detection block under the two curved pipes 21 at the output end. When the jig block 9 slides down from the curved pipe 21 and abuts against the end of the screw rail 4, the jig detection block detects the existence of the jig block 9. At this time, the conveyor belt 1 is started to stop conveying. After the circuit board on the previous jig block 9 is tested, the dual-axis motor 3 is started to continue running, driving the jig block 9 in contact with the end of the screw rail 4 to be transported to the screw rail 4 for testing, and at the same time, the conveyor belt 1 is started to continue conveying the jig block 9.

[0029] The fixture detection block is equivalent to a distance measuring laser. When the fixture block is on it, it can detect that the fixture block is in place, thereby starting and stopping the subsequent work.

[0030] The length of the screw rail 4 is not less than the sum of the widths of the three fixture blocks 9. It is convenient to reach three fixture blocks on it, one is tested and transported away, one is being tested, and one can wait for testing.

[0031] The tester 10 is provided with a spray terminal, and when the tester 10 detects an abnormality of an abnormal circuit board, an abnormal identification code will be sprayed onto the circuit board. The abnormality is sprayed with a code to facilitate subsequent discharge.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A testing device for circuit board processing, characterized in that: It includes a circuit board fixture feeding mechanism, a circuit board detection and transportation mechanism, a testing mechanism and a circuit board testing fixture; The circuit board jig feeding mechanism comprises a conveyor belt (1) and two jig guide tubes (2), the two jig guide tubes (2) are provided with downwardly inclined curved tubes (21) near both ends and the lower half of the curved tubes (21) is cut off, the curved tubes (21) are supported by a support rod below the middle position, and the two jig guide tubes (2) are arranged in parallel above the conveyor belt (1) and do not contact the conveyor belt (1); The circuit board detection and transport mechanism comprises two parallel screw rails (4) and a double-axis motor (3), wherein two ends of the screw rail (4) are provided with rotating shafts (41), and the rotating shafts (41) at both ends are sleeved with bearings (411), and the bearings (411) are sleeved and fixed by the top ends of the mounting rods (412), the top ends of the mounting rods (412) are semicircular, and the width of the mounting rods (412) is smaller than the diameter of the screw rails (4), and the top ends of the mounting rods (412) are lower than the top ends of the screw rails (4), and the two ends of the screw rails (4) are sleeved with bearings (411). A driven bevel gear disc (42) is sleeved on the end of the rotating shaft (41) on the same side of the screw rail (4), and an active bevel gear disc (31) is sleeved on the rotating shafts at both ends of the dual-shaft motor (3), and the two active bevel gear discs (31) are respectively meshed with the corresponding driven bevel gear discs (42), and the bent pipes (21) at the output ends of the two jig guide tubes (2) are connected to the input ends of the screw rail (4) and the bent pipes (21) are sleeved above the top of the mounting rod (412); The test mechanism comprises a test installation box (5), a tester (10) installed in the test installation box (5), four installation frames (6) and two slide bars (61), wherein the four installation frames (6) are symmetrically arranged in pairs on the outside of the two screw rails (4), and the slide bars (61) are connected between the top ends of the installation frames (6) on the same side, and the top ends of the test installation box (5) close to the two sides are movably sleeved on the corresponding slide bars (61), and the middle position of the bottom of the test installation box (5) is provided with a mounting groove, and four limiting rods (102) are provided at four corner positions in the mounting groove, and the four corner positions of the tester (10) are movably sleeved on the four limiting rods (102), and the bottom of the mounting groove is provided with a mounting groove. A push-down motor (101) is provided at the intermediate position and a push-down screw is connected to the rotating shaft of the push-down motor (101), the push-down screw is spirally inserted into the center position of the top of the tester (10), a plurality of pin docking joints (103) are provided at the bottom of the tester (10), a label identifier (51) is provided at the top of the left wall of the test installation box (5), an aligner (52) is provided at the middle position of the bottom of the test installation box (5) near the two side edges, a connecting rod is provided between the two mounting frames at the rear side, a servo motor is provided on the connecting rod, a fine-tuning screw (71) is connected to the rotating shaft of the servo motor (7), and the fine-tuning screw (71) is spirally inserted into the side wall of the test installation box (5); The circuit board test fixture comprises a fixture block (9), an identification label (93) and an alignment label (94); a square card slot (92) is provided at the middle position of the fixture block (9); a hollow square hole (95) is provided at the middle position of the square card slot (92); a square rubber edge (921) is attached to the side wall of the square card slot (92); an identification label (93) is provided on the upper surface of the front and rear sides of the square card slot (92) of the fixture block (9); an alignment label (94) is provided on the middle position of the left and right sides of the square card slot (92) of the fixture block (9); two parallel long strip card slots (91) are provided on the lower surface of the fixture block (9); the upper half of the long strip card slot (91) is semi-cylindrical and the lower half is square strip; the semi-cylindrical inner wall of the long strip card slot (91) is provided with a thread matching the screw track (4).

2. A circuit board processing test device according to claim 1, characterized in that: The diameter of the jig guide tube (2) is 4 / 5 of the diameter of the screw track (4), and the section of the jig guide tube (2) above the conveyor belt (1) does not contact the inner wall of the semi-cylindrical portion of the long strip bayonet (91).

3. A circuit board processing test device according to claim 1, characterized in that: The output ends of the two screw rails (4) are correspondingly connected to output rails (8), and the rear half of the output rails (8) is provided with a descending rail (81).

4. A circuit board processing test device according to claim 1, characterized in that: A ventilation elbow (50) is provided on the left and right side walls of the test installation box (5), the output end of the ventilation elbow (50) faces below the tester (10), and a blower (501) is provided inside the ventilation elbow (50).

5. A circuit board processing test device according to claim 1, characterized in that: The jig block (9) is provided with positioning holes (96) at four corners near the square slot (92); four positioning cylinders (53) are embedded in the bottom of the test installation box (5); the cylinder shaft end of the positioning cylinder (53) is conical; the cylinder shaft of the positioning cylinder (53) is sleeved with a pressing sheet (532) above the cone; after the cylinder shaft of the positioning cylinder (53) is inserted into the positioning hole (96), the pressing sheet (532) just presses on the corner of the circuit board.

6. A circuit board processing test device according to claim 1, characterized in that: The depth of the square slot (92) is 2 / 3 of the thickness of the circuit board. A positioning column (922) is provided on the square rubber edge fan, and the positioning column (922) corresponds to the positioning slot at the edge of the circuit board.

7. A circuit board processing test device according to claim 1, characterized in that: The jig guide tube (2) is provided with a jig detection block below the two curved pipes (21) at the output end. When the jig block (9) slides down from the curved pipe (21) and abuts against the end of the lead screw track (4), the jig detection block detects the presence of the jig block (9). At this time, the conveyor belt (1) is started to stop the conveyance. When the circuit board on the previous jig block (9) is tested, the dual-axis motor (3) is started to continue to operate, driving the jig block (9) in contact with the end of the lead screw track (4) to be transported to the lead screw track (4) for testing, and at the same time, the conveyor belt (1) is started to continue to transport the jig block (9).

8. A circuit board processing test device according to claim 1, characterized in that: The length of the screw rail (4) is not less than the sum of the widths of the three fixture blocks (9).

9. A circuit board processing testing device according to claim 1, characterized in that: The tester (10) is provided with a spray terminal, and when the tester (10) detects an abnormality in the abnormal circuit board, it sprays an abnormal identification code onto the circuit board.

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