Heating station and method of use thereof

Abstract

The application belongs to the technical field of circuit board tin removal and soldering equipment, and particularly relates to a heating table and a use method thereof. The heating table comprises a shell, a heat-conducting panel, a first clamping block and a second clamping block. The upper end of the shell is provided with a mounting hole, and the mounting hole is provided with a heating disc. The heat-conducting panel is arranged above the heating disc. The upper end of the heat-conducting panel is provided with a heating position corresponding to the heating disc. The heat released by the heating disc can be transmitted to the heating position. The first clamping block and the second clamping block are oppositely arranged on the two sides of the heating position. The first clamping block can move towards the second clamping block to tightly press the circuit board on the heating position against the second clamping block. The application can make the circuit board in a horizontal state by arranging a step, so that each position of the circuit board can be uniformly heated. By arranging the first clamping block to be capable of moving towards the second clamping block, it is ensured that the circuit board can be kept stable during the operation of dismounting or soldering electronic components, thereby improving the accuracy of the operation.

Description

Technical Field

[0001] This invention belongs to the technical field of circuit board desoldering and soldering equipment, and particularly relates to a heating table and its usage method. Background Technology

[0002] With rapid social progress and technological development, the penetration rate of electronic and electrical products is increasing, and the pace of replacement is also accelerating, resulting in a large number of discarded electronic and electrical products. Circuit boards are widely used in electronic and electrical products, so the amount of discarded circuit boards is also very large, necessitating their recycling. Currently, the main methods used in the market are hot air guns or soldering irons to desolder or solder electronic components on circuit boards, which are relatively inconvenient and inefficient. Summary of the Invention

[0003] The purpose of this invention is to provide a heating table that can solve the above-mentioned problems and its method of use.

[0004] To achieve the above objectives, an embodiment of the present invention provides a heating stage, comprising:

[0005] The housing has a mounting hole at its upper end, and a heating plate is installed at the mounting hole.

[0006] A heat-conducting panel is disposed above the heating plate, and the upper end of the heat-conducting panel has a heating position corresponding to the heating plate, so that the heat released by the heating plate can be transferred to the heating position;

[0007] The first clamp and the second clamp are arranged opposite each other on both sides of the heating position, and steps are provided on the opposite surfaces of the two clamps. The upper ends of the two steps are flush, and the lower end of the circuit board abuts against the steps. The first clamp can move toward the second clamp to clamp the circuit board.

[0008] Optionally, it also includes a mounting base and a slide, which are disposed at the upper end of the housing. The heat-conducting panel is mounted on the upper end of the mounting base, and the mounting base is provided with a through hole corresponding to the mounting hole.

[0009] The mounting base is provided with a lead screw, which is arranged along the movement direction of the first clamping block. A nut is matched on the lead screw, the slide is connected to the nut, and the first clamping block is connected to the slide.

[0010] The lead screw can rotate about its axis to drive the nut to move the slide along the axis of the lead screw.

[0011] Optionally, the mounting base is provided with a receiving groove, the slide is disposed in the receiving groove, the heat-conducting panel covers the upper end of the mounting base, the heat-conducting panel is provided with a first strip-shaped hole opened along the movement direction of the first clamping block, the first clamping block is provided with a connecting seat corresponding to the first strip-shaped hole, and the connecting seat passes through the first strip-shaped hole and connects to the slide.

[0012] Optionally, it also includes guide rods, which are respectively disposed on both sides of the slide and arranged along the movement direction of the first clamping block. A first slider is matched on the guide rod, and the first slider is connected to the slide.

[0013] Optionally, the two ends of the lead screw are respectively rotatably connected to a first fixed seat and a second fixed seat. The first fixed seat is located close to the through hole. Two outwardly extending elastic walls are provided on the outer wall of the through hole. The two elastic walls are symmetrically arranged about the axis of the lead screw and are inclined in opposite directions. The first fixed seat is located between the two elastic walls and is elastically connected to the elastic walls. The lower end of the first fixed seat abuts against the inner bottom wall of the receiving groove.

[0014] The side wall of the mounting base is provided with a notch corresponding to the second fixing base. The notch communicates with the receiving groove, and the second fixing base is fixed at the notch.

[0015] Optionally, the mounting base is provided with a strip groove corresponding to the second clamping block, the strip groove is provided along the width direction of the housing, and the heat-conducting panel is provided with a second strip hole corresponding to the strip groove;

[0016] At least two second clamping blocks are provided along the width direction of the housing, and a second slider adapted to the strip groove is provided at the lower end of the second clamping block; the second slider is slidably connected to the strip groove.

[0017] The first clamping block extends along the width direction of the housing.

[0018] Optionally, it also includes an operating element disposed at the end of the lead screw away from the through hole.

[0019] Optionally, it also includes a cooling fan and a control module, both of which are located inside the housing. A temperature sensor is provided on the heating plate to detect the heating temperature of the heating plate. The cooling fan corresponds to the heating plate. An air inlet corresponding to the cooling fan is provided at the lower end of the housing, and an air outlet is provided on the side wall of the housing.

[0020] The control module is electrically connected to the cooling fan, the temperature sensor, and the heating plate. The heat-conducting panel is equipped with a control switch and a temperature switching switch connected to the control module.

[0021] Optionally, the thermally conductive panel is a microcrystalline panel or a ceramic panel.

[0022] The present invention also provides a method of using the above-mentioned heating platform, comprising the following steps:

[0023] 1) Feeding:

[0024] Rotate the operating component clockwise or counterclockwise to adjust the distance between the first clamp and the second clamp so that the circuit board can be placed on the steps of the first clamp and the second clamp;

[0025] 2) Clamping the circuit board:

[0026] Rotate the operating component clockwise to drive the first clamping block to move toward the second clamping block until the circuit board is clamped.

[0027] 3) Start heating:

[0028] When the control switch is turned on, the control module controls the heating plate to work and release heat. The heat released by the heating plate is transferred to the circuit board through the heating position.

[0029] 4) Temperature control:

[0030] Turn on the temperature switch to select the temperature setting value, the control module reads the signal, and controls the temperature sensor to detect the heating temperature of the heating plate;

[0031] When the temperature sensor detects that the temperature of the heating plate is higher than the set temperature value, the control module controls the cooling fan to start to dissipate heat from the heating plate, so that the heating temperature of the heating plate is kept constant at the set temperature value.

[0032] 5) Disassembling or soldering electronic components:

[0033] Use tools to remove electronic components from the circuit board, or melt solder bars onto the silver pins of the electronic components;

[0034] 6) Stop heating:

[0035] When the control switch is turned off, the control module stops the heating plate from working.

[0036] When the temperature switching switch is turned off, the control module reads the signal. When the temperature sensor detects that the temperature of the heating plate has dropped to room temperature, the control module controls the cooling fan to stop working.

[0037] 7) Material preparation:

[0038] Rotate the operating component counterclockwise to move the first clamp away from the second clamp and remove the circuit board.

[0039] Compared with the prior art, the beneficial effects of the present invention are: the step setting can avoid the problem of uneven placement of the circuit board due to the uneven height of the silver pins on the electronic components, so that the circuit board is in a horizontal state, and all parts of the circuit board can be heated evenly, which can improve the efficiency of disassembling or soldering electronic components.

[0040] By configuring the first clamping block to move toward the second clamping block, the first and second clamping blocks can clamp the circuit board, ensuring that the circuit board remains stable during operations such as disassembling or soldering electronic components, avoiding operational errors caused by shaking, improving operational accuracy, and accommodating circuit boards of different sizes. The heating table also has the advantages of high heat utilization and relatively low energy consumption, effectively preventing electronic components from being damaged by heat. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a top view of the present invention.

[0043] Figure 2 For along Figure 1 Sectional view along line AA in the middle.

[0044] Figure 3 This is a perspective view of the invention with the heat-conducting panel hidden.

[0045] Figure 4 This is a top view of the mounting base in this invention.

[0046] In the picture:

[0047] 100. Housing; 110. Mounting hole; 120. Heating plate; 130. Air inlet; 140. Air outlet; 150. Control module; 160. Control switch; 170. Temperature switching switch; 180. Temperature sensor;

[0048] 200, Heat-conducting panel; 210, Heating position; 220, First strip hole;

[0049] 300. First clamping block; 310. Step;

[0050] 400. Second clamping block; 410. Second slider;

[0051] 500, Mounting base; 510, Through hole; 511, Elastic wall; 520, Lead screw; 521, First fixing base; 522, Second fixing base; 530, Nut; 540, Receiving groove; 550, Notch; 560, Strip groove; 570, Second strip hole;

[0052] 600, slide block;

[0053] 700, guide rod; 710, first slider;

[0054] 800. Operating components;

[0055] 900. Cooling fan. Detailed Implementation

[0056] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain embodiments of the present invention, and should not be construed as limiting the present invention.

[0057] In the description of the embodiments of the present invention, it should be understood that if the embodiments of the present invention involve directional indications, such as up, down, left, right, front, back, inside, outside, etc., the orientation or positional relationship of the indications is based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the embodiments of the present invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0059] In this embodiment of the invention, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part. They can be mechanical or electrical connections. They can be direct connections or indirect connections through an intermediate medium, and can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0060] like Figures 1 to 4 As shown, an embodiment of the present invention provides a heating platform, including a housing 100, a heat-conducting panel 200, a first clamping block 300, a second clamping block 400, a mounting base 500, a slide 600, a guide rod 700, an operating component 800, and a cooling fan 900.

[0061] The upper end of the housing 100 is provided with a mounting hole 110, and a heating plate 120 is provided at the mounting hole 110. The heat-conducting panel 200 is located above the heating plate 120. Specifically, the heat-conducting panel 200 is a microcrystalline panel or a ceramic panel. The upper end of the heat-conducting panel 200 has a heating position 210 corresponding to the heating plate 120. The heat released by the heating plate 120 can be transferred to the heating position 210.

[0062] Furthermore, the first clamping block 300 and the second clamping block 400 are arranged opposite each other on both sides of the heating position 210. Specifically, the first clamping block 300 and the second clamping block 400 are preferably arranged opposite each other on both sides of the heating platform 210 along the length direction of the housing 100. Steps 310 are provided on the opposite surfaces of the first clamping block 300 and the second clamping block 400. The upper ends of the two steps 310 are flush, and the lower end of the circuit board abuts against the steps 310. The step 310 can prevent the circuit board from being unevenly placed due to the uneven height of the silver pins on the electronic components. That is, the steps of the first clamping block 300 and the second clamping block 400 can keep the circuit board in a horizontal state, so that all parts of the circuit board can be heated evenly, which can improve the efficiency of disassembling or soldering electronic components.

[0063] Furthermore, the first clamping block 300 can move toward the second clamping block 400 to clamp the circuit board, ensuring that the circuit board remains stable when performing operations such as disassembling or soldering electronic components, avoiding operational errors caused by shaking, improving operational accuracy, and adapting to the clamping of circuit boards of different sizes.

[0064] This heating platform has the advantages of high heat utilization rate and relatively low energy consumption, and can effectively prevent electronic components from being damaged by heat.

[0065] In one embodiment, such as Figure 1 , 2 As shown in Figure 3, the mounting base 500 and the slide 600 are disposed at the upper end of the housing 100. The heat-conducting panel 200 is mounted on the upper end of the mounting base 500. The mounting base 500 is provided with a through hole 510 corresponding to the mounting hole 110. It should be noted that the upper end of the heating plate 120 extends upward into the interior of the through hole 510 and forms a gap with the lower end of the heat-conducting panel 200.

[0066] A lead screw 520 is provided on the mounting base 500. The lead screw 520 is set along the movement direction of the first clamping block 300. A nut 530 is matched on the lead screw 520. The slide block 600 is connected to the nut 530, and the first clamping block 300 is connected to the slide block 600. The lead screw 520 can rotate around its axis to drive the nut 530 to drive the slide block 600 to move along the axis of the lead screw 520. That is, the movement distance of the first clamping block 300 is precisely controlled by the lead screw 520, so as to better adapt to the fixing requirements of circuit boards of different sizes.

[0067] In one embodiment, such as Figure 1 , 2 As shown in Figure 3, the operating element 800 is located at the end of the lead screw 520 away from the through hole 510. Specifically, the operating element 800 is preferably a knob, which facilitates the operation of the operator to adjust the position of the first clamping block 300.

[0068] Of course, in some embodiments, the first clamping block 300 can also be moved by rotating the lead screw 520 driven by a motor.

[0069] In one embodiment, such as Figure 1 , 3 As shown in Figure 4, the mounting base 500 is provided with a receiving groove 540, and the slide 600 is disposed in the receiving groove 540 to save space, improve space utilization, and make the overall structure more compact.

[0070] The heat-conducting panel 200 covers the upper end of the mounting base 500. The heat-conducting panel 200 is provided with a first strip hole 220 along the movement direction of the first clamping block 300. The first clamping block 300 is provided with a connecting seat corresponding to the first strip hole 220. The connecting seat passes through the first strip hole 220 and connects to the slide 600. The first strip hole 220 can limit the movement distance and movement direction of the first clamping block 300, ensuring the stability of the movement of the first clamping block 300.

[0071] In one embodiment, such as Figure 3 As shown, two guide rods 700 are respectively disposed on both sides of the slide 600 and are set along the movement direction of the first clamping block 300. A first slider 710 is matched on the guide rod 700. The first slider 710 is connected to the slide 600 and guides the slide 600 to ensure the stability of the movement of the slide 600 and to prevent it from deviating and affecting the work.

[0072] In one embodiment, such as Figure 3 and 4As shown, the two ends of the lead screw 520 are rotatably connected to a first fixed seat 521 and a second fixed seat 522, respectively. The first fixed seat 521 is located near the through hole 510. Two outwardly extending elastic walls 511 are provided on the outer wall of the through hole 510. The two elastic walls 511 are symmetrically arranged about the axis of the lead screw 520 and are inclined in opposite directions. The first fixed seat 521 is located between the two elastic walls 511 and is elastically connected to the elastic walls 511, that is, the two elastic walls 511 clamp the first fixed seat 521. The lower end of the first fixed seat 521 abuts against the inner bottom wall of the receiving groove 540. The side wall of the mounting base 500 is provided with a notch 550 corresponding to the second fixed seat 522. The notch 550 communicates with the receiving groove 540. The second fixed seat 522 is fixed at the notch 550. This installation method makes the installation and disassembly of the lead screw 520 more convenient and quick, and facilitates the maintenance and replacement of the lead screw 520.

[0073] In one embodiment, such as Figure 1 and 3 As shown, the mounting base 500 is provided with a strip groove 560 corresponding to the second clamping block 400. The strip groove 560 is provided along the width direction of the housing 100. The heat-conducting panel 200 is provided with a second strip hole 570 corresponding to the strip groove 560. At least two second clamping blocks 400 are provided along the width direction of the housing 100. The lower end of the second clamping block 400 is provided with a second slider 410 adapted to the strip groove 560. The second slider 410 is slidably connected to the strip groove 560. The first clamping block 300 extends along the width direction of the housing 100 to ensure the stability of clamping. The strip groove 560 and the second slider 410 enable the second clamping block 400 to move to adapt to circuit boards of different widths and shapes, ensure the force on the circuit board, and improve the convenience of use.

[0074] In one embodiment, such as Figure 1 and 2 As shown, the cooling fan 900 and the control module 150 are both located inside the housing. The cooling fan 900 corresponds to the heating plate 120. The lower end of the housing 100 is provided with an air inlet 130 corresponding to the cooling fan 900, and the side wall of the housing 100 is provided with an air outlet 140. The cooling fan 900 is provided to dissipate heat from the heating plate 120 to facilitate subsequent operation.

[0075] A temperature sensor 180 is provided on the heating plate 120. Specifically, the heating plate 120 is installed in the middle of the upper end of the heating plate 120, and the temperature sensor 180 is used to detect the heating temperature of the heating plate 120.

[0076] The control module 150 is electrically connected to the cooling fan 900, the temperature sensor 180, and the heating plate 120. The heat-conducting panel 200 is equipped with a control switch 160 and a temperature switching switch 170 connected to the control module 150. Specifically, the control switch 160 and the temperature switching switch 170 pass through the heat-conducting panel 200, the mounting base 500, and the housing 100 and are electrically connected to the control module 150 for user operation.

[0077] The present invention also provides a method of using the above-mentioned heating platform, comprising the following steps:

[0078] 1) Loading: Specifically, the operator adjusts the distance between the first clamping block 300 and the second clamping block 400 by rotating the operating component 800 clockwise or counterclockwise, so that the circuit board can be placed on the step 310 of the first clamping block 300 and the second clamping block 400.

[0079] 2) Clamping the circuit board: Specifically, the operator rotates the operating part 800 clockwise to drive the first clamping block 300 to move toward the second clamping block 400 until the circuit board is clamped.

[0080] 3) Start heating. Specifically, the operator turns on the control switch 160, and the control module 150 controls the heating plate 120 to release heat. The heat released by the heating plate 120 is transferred to the circuit board through the heating position.

[0081] 4) Temperature control: Specifically, the operator turns on the temperature switch 170 to select the temperature setting value. The control module 150 reads the signal and controls the temperature sensor 180 to detect the heating temperature of the heating plate 120. It should be noted that the temperature setting value ranges from 200 to 400 degrees Celsius. The heating table will be electrically connected to the main unit during use, and the main unit can adjust the lid temperature setting value.

[0082] When the temperature sensor 180 detects that the temperature of the heating plate 120 is higher than the set temperature value, the control module 150 controls the cooling fan 900 to start, so as to dissipate heat from the heating plate 120 and keep the heating temperature of the heating plate 120 constant at the set temperature value.

[0083] 5) Disassembling or soldering electronic components. Specifically, workers use tools such as tweezers to remove electronic components from the circuit board to complete the disassembly. Alternatively, solder bars can be melted onto the silver pins of the electronic components to secure them and complete the assembly.

[0084] 6) Stop heating. Specifically, the operator turns off the control switch 160, and the control module 150 controls the heating plate 120 to stop working. Further, the temperature switching switch 170 is turned off, and the control module 150 reads the signal. When the temperature sensor 180 detects that the temperature of the heating plate 120 has dropped to room temperature, the control module 150 controls the cooling fan 900 to stop working.

[0085] 7) Unloading: Specifically, the operator rotates the operating part 800 counterclockwise to move the first clamping block 300 away from the second clamping block 400 and remove the circuit board.

[0086] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A heating platform, characterized in that, include: The housing has a mounting hole at its upper end, and a heating plate is installed at the mounting hole. A heat-conducting panel is disposed above the heating plate, and the upper end of the heat-conducting panel has a heating position corresponding to the heating plate, so that the heat released by the heating plate can be transferred to the heating position; The first clamp and the second clamp are arranged opposite each other on both sides of the heating position, and steps are provided on the opposite surfaces of the two clamps. The upper ends of the two steps are flush, and the lower end of the circuit board abuts against the steps. The first clamp can move toward the second clamp to clamp the circuit board.

2. A heating table according to claim 1, characterized in that, Also includes: A mounting base and a slide are disposed at the upper end of the housing. The heat-conducting panel is mounted on the upper end of the mounting base. The mounting base is provided with through holes corresponding to the mounting holes. The mounting base is provided with a lead screw, which is arranged along the movement direction of the first clamping block. A nut is matched on the lead screw, the slide is connected to the nut, and the first clamping block is connected to the slide. The lead screw can rotate about its axis to drive the nut to move the slide along the axis of the lead screw.

3. A heating table according to claim 2, characterized in that, The mounting base is provided with a receiving groove, the slide is disposed in the receiving groove, the heat-conducting panel covers the upper end of the mounting base, the heat-conducting panel is provided with a first strip hole opened along the movement direction of the first clamping block, the first clamping block is provided with a connecting seat corresponding to the first strip hole, and the connecting seat passes through the first strip hole and connects to the slide.

4. A heating table according to claim 3, characterized in that, The two ends of the lead screw are respectively rotatably connected to a first fixed seat and a second fixed seat. The first fixed seat is located close to the through hole. Two outwardly extending elastic walls are provided on the outer wall of the through hole. The two elastic walls are symmetrically arranged about the axis of the lead screw and are inclined in opposite directions. The first fixed seat is located between the two elastic walls and is elastically connected to the elastic walls. The lower end of the first fixed seat abuts against the inner bottom wall of the receiving groove. The side wall of the mounting base is provided with a notch corresponding to the second fixing base. The notch communicates with the receiving groove, and the second fixing base is fixed at the notch.

5. A heating table according to claim 2, characterized in that, Also includes: Guide rods are disposed on both sides of the slide block and are arranged along the movement direction of the first clamping block. A first slider is matched on the guide rod and the first slider is connected to the slide block.

6. A heating table according to claim 2, characterized in that, The mounting base is provided with a strip groove corresponding to the second clamping block, the strip groove is provided along the width direction of the housing, and the heat-conducting panel is provided with a second strip hole corresponding to the strip groove; At least two second clamping blocks are provided along the width direction of the housing, and a second slider adapted to the strip groove is provided at the lower end of the second clamping block; the second slider is slidably connected to the strip groove. The first clamping block extends along the width direction of the housing.

7. A heating table according to claim 2, characterized in that, Also includes: An operating element is located at the end of the lead screw away from the through hole.

8. A heating table according to claim 1, characterized in that, Also includes: The cooling fan and control module are both located inside the housing. A temperature sensor is installed on the heating plate to detect the heating temperature of the heating plate. The cooling fan corresponds to the heating plate. An air inlet corresponding to the cooling fan is provided at the lower end of the housing. An air outlet is provided on the side wall of the housing. The control module is electrically connected to the cooling fan, the temperature sensor, and the heating plate. The heat-conducting panel is equipped with a control switch and a temperature switching switch connected to the control module.

9. A heating table according to claim 1, characterized in that, The heat-conducting panel is a microcrystalline panel or a ceramic panel.

10. A method of using a heating table as described in any one of claims 1 to 9, characterized in that, Includes the following steps: 1) Feeding: Rotate the operating component clockwise or counterclockwise to adjust the distance between the first clamp and the second clamp so that the circuit board can be placed on the steps of the first clamp and the second clamp; 2) Clamping the circuit board: Rotate the operating component clockwise to drive the first clamping block to move toward the second clamping block until the circuit board is clamped. 3) Start heating: When the control switch is turned on, the control module controls the heating plate to work and release heat. The heat released by the heating plate is transferred to the circuit board through the heating position. 4) Temperature control: Turn on the temperature switch to select the temperature setting value, the control module reads the signal, and controls the temperature sensor to detect the heating temperature of the heating plate; When the temperature sensor detects that the temperature of the heating plate is higher than the set temperature value, the control module controls the cooling fan to start to dissipate heat from the heating plate, so that the heating temperature of the heating plate is kept constant at the set temperature value. 5) Disassembling or soldering electronic components: Use tools to remove electronic components from the circuit board, or melt solder bars onto the silver pins of the electronic components; 6) Stop heating: When the control switch is turned off, the control module stops the heating plate from working. When the temperature switching switch is turned off, the control module reads the signal. When the temperature sensor detects that the temperature of the heating plate has dropped to room temperature, the control module controls the cooling fan to stop working. 7) Material preparation: Rotate the operating component counterclockwise to move the first clamp away from the second clamp and remove the circuit board.

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