Electronic circuit board, reproduction electronic circuit board and method for producing reproduction electronic circuit board

Abstract

To provide an electronic circuit board which can improve safety during energization.SOLUTION: An electronic circuit board includes a capacitor, and a power supply control circuit which has a photocoupler, and controls supply of power to a predetermined circuit including the capacitor, wherein the power supply control circuit supplies the power to the predetermined circuit and thereby the capacitor is energized when the photocoupler is energized and normally operated according to the power supplied from the outside, the capacitor is not energized by no supply of the power to the predetermined circuit by the power supply control circuit when the photocoupler is not normally operated, the normal operation of the photocoupler is guaranteed until the energization time reaches a first time, the predetermined quality of the capacitor is guaranteed until the energization time reaches a second time, and the first time is shorter than the second time.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electronic circuit board, a recycled electronic circuit board, and a method for producing a recycled electronic circuit board. [Background technology]

[0002] In recent years, in order to reduce the environmental impact, so-called refurbished products have been attracting attention. These products are refurbished to a condition similar to that of an unused product and then re-released on the market. Such refurbished products can reduce the amount of waste, thereby reducing the environmental impact. For example, refurbished or reused office equipment such as copiers are widely available. As a technology for recycling parts in office equipment, parts management using usage history, as described in Patent Document 1, has been widely adopted, and products that have been refurbished or reused on a unit-by-unit basis based on the usage history have been introduced to the market. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-053864 Summary of the Invention [Problem to be solved by the invention]

[0004] However, there was still room for improvement in the above-mentioned recycling and reuse efforts. [Means for solving the problem]

[0005] One aspect of the electronic circuit board according to the present invention is A capacitor and a power supply control circuit having a photocoupler and controlling the supply of power to a predetermined circuit including the capacitor; Equipped with When the photocoupler is energized in response to the externally supplied power and operates normally, the power supply control circuit supplies power to the predetermined circuit, causing the capacitor to enter a conductive state, When the photocoupler does not operate normally, the power supply control circuit does not supply power to the predetermined circuit, and the capacitor does not enter a conducting state, The photocoupler is guaranteed to operate normally until the power-on time reaches the first time, The capacitor is guaranteed to maintain a predetermined quality until the energization time reaches a second time, The first time period is less than the second time period.

[0006] One aspect of the regenerated electronic circuit board according to the present invention is: A regenerated electronic circuit board that has been regenerated by replacing a first capacitor and a first photocoupler that were provided on the electronic circuit board with a second capacitor and a second photocoupler, respectively, the second capacitor; a power supply control circuit having the second photocoupler and controlling the supply of power to a predetermined circuit including the second capacitor; Equipped with When the second photocoupler is energized in response to the external power supply and operates normally, In this case, the power supply control circuit supplies power to the predetermined circuit, causing the second capacitor to enter a conducting state, When the second photocoupler does not operate normally, the power supply control circuit does not supply power to the predetermined circuit, and therefore the second capacitor does not enter a conducting state; The second photocoupler is guaranteed to operate normally until the power-on time reaches the first time, the second capacitor is guaranteed to maintain a predetermined quality until the energization time reaches a second time; The first time period is less than the second time period.

[0007] One aspect of the method for producing recycled electronic circuit boards according to the present invention includes: a power supply control circuit having a first capacitor and a first photocoupler and controlling supply of power to a predetermined circuit including the first capacitor, wherein when the first photocoupler is energized in response to power supplied from an external source and operates normally, the power supply control circuit supplies power to the predetermined circuit, causing the first capacitor to be energized; when the first photocoupler does not operate normally, the power supply control circuit does not supply power to the predetermined circuit, causing the first capacitor not to be energized; the first photocoupler is guaranteed to operate normally until a first period of time has passed; and the first capacitor is guaranteed to maintain a predetermined quality until a second period of time has passed; and the first period of time is shorter than the second period of time. providing power to the electronic circuit board; and if the first photocoupler does not operate normally, replacing the first capacitor and the first photocoupler with a second capacitor and a second photocoupler, respectively. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a diagram showing a schematic configuration of an electronic circuit board. [Figure 2] 10A and 10B are diagrams illustrating an example of the change over time in the capacitance of a capacitor and the change over time in the current transfer rate of a photocoupler. [Figure 3] 1A and 1B are diagrams illustrating a specific configuration example of an electronic circuit board. [Figure 4] FIG. 1 is a diagram showing a schematic configuration of a regenerated electronic circuit board. [Figure 5] 1A and 1B are diagrams showing a specific example of the configuration of a recycled electronic circuit board. [Figure 6] FIG. 1 is a flowchart showing an example of the steps of a method for producing recycled electronic circuit boards. [Figure 7] 1A and 1B are diagrams illustrating an example of the structure of a liquid ejection device. [Figure 8] FIG. 2 is a diagram illustrating an example of a functional configuration of the liquid ejection device. DETAILED DESCRIPTION OF THE INVENTION

[0009] Preferred embodiments of the present invention will be described below with reference to the drawings. The drawings used are for the convenience of explanation. Note that the embodiments described below do not unduly limit the content of the present invention as defined in the claims. Furthermore, not all of the configurations described below are necessarily essential components of the present invention.

[0010] 1. Electronic circuit board 1 is a diagram showing a schematic configuration of an electronic circuit board according to the present embodiment. As shown in FIG. 1, the electronic circuit board 1 according to the present embodiment includes a power supply control circuit 10 and a capacitor 21.

[0011] The power supply control circuit 10 has a photocoupler 11 and controls the supply of power to a predetermined circuit including a capacitor 21. When the photocoupler 11 is energized in response to power supplied from outside the electronic circuit board 1 and operates normally, the power supply control circuit 10 supplies power to the predetermined circuit, causing the capacitor 21 to enter a conductive state. If photocoupler 11 does not operate normally, power supply control circuit 10 will not supply power to the specified circuit, and capacitor 21 will not be energized. Here, "photocoupler 11 operates normally" may mean, for example, that the current transfer ratio CTR when photocoupler 11 is operating is equal to or greater than a specified threshold. The current transfer ratio CTR is the ratio of the output current flowing to the light-receiving element to the input current flowing to the light-emitting element.

[0012] 1, for example, a power supply voltage VIN based on power supplied from outside the electronic circuit board 1 is input to a power supply control circuit 10, and the supply of the power supply voltage VIN to a predetermined circuit including a capacitor 21 is controlled by the operation of a photocoupler 11. The power supply voltage VIN may be input from outside the electronic circuit board 1, or the electronic circuit board 1 may be provided with a power supply circuit that outputs the power supply voltage VIN based on power supplied from outside.

[0013] Normal operation of the photocoupler 11 is guaranteed until the energization time reaches the first time t1. Conversely, once the energization time reaches the first time t1, normal operation of the photocoupler 11 is no longer guaranteed and the photocoupler 11 reaches the end of its life. As shown in FIG. 2, the amount of light emitted by the light-emitting element of the photocoupler 11 decreases over time, and as a result, the current transfer ratio CTR decreases. Then, once the energization time reaches the first time t1, the current transfer ratio CTR of the photocoupler 11 decreases to a predetermined threshold, normal operation of the photocoupler 11 is no longer guaranteed, and the photocoupler 11 reaches the end of its life.

[0014] The capacitor 21 is guaranteed to have a predetermined quality until the energization time reaches the second time t2. Conversely, when the energization time reaches the second time t2, the predetermined quality of the capacitor 21 is no longer guaranteed and the capacitor reaches the end of its life. The "predetermined quality of the capacitor 21" may mean, for example, that the capacitance of the capacitor 21 is equal to or greater than a predetermined threshold. As shown in FIG. 2, the capacitance of the capacitor 21 decreases over time. Then, when the energization time reaches the second time t2, the capacitance of the capacitor 21 decreases to the predetermined threshold, the predetermined quality of the capacitor 21 is no longer guaranteed, and the capacitor reaches the end of its life.

[0015] The capacitor 21 may be, for example, an electrolytic capacitor, or may be an aluminum electrolytic capacitor. Electrolytic capacitors are widely used because they have a large capacitance and are inexpensive. However, their capacitance decreases over time due to the evaporation of the electrolyte, and they are thought to reach the end of their life when, for example, the capacitance decreases by 20%. The life of an electrolytic capacitor varies greatly depending on the operating temperature, and according to the Arrhenius law, it is known that the life is reduced by approximately half for every 10°C increase in operating temperature. In general, the life of an electrolytic capacitor is shorter than that of other electronic components, and although it depends on the operating temperature, it is said to reach the end of its life in, for example, about 10 years.

[0016] 2, the first time t1 is shorter than the second time t2. For example, the photocoupler 11 may be subjected to an aging process so that the first time t1 is shorter than the second time t2. The aging process is, for example, a process of accelerating the deterioration of the photocoupler 11 by passing current through the photocoupler 11. The photocoupler 11 and the capacitor 21 tend to have shorter lifespans than other electronic components, and furthermore, the lifespan of the photocoupler 11 is shorter than the lifespan of the capacitor 21.

[0017] As described above, when photocoupler 11 is energized and operates normally, capacitor 21 is energized, so the energization time of photocoupler 11 and the energization time of capacitor 21 are approximately equal. In this case, because first time t1 is shorter than second time t2, photocoupler 11 will reach the end of its life before capacitor 21 and will no longer operate normally. Furthermore, if photocoupler 11 does not operate normally, power will not be supplied to a specified circuit, so power will not be supplied to the specified circuit after capacitor 21 reaches the end of its life. This reduces the risk of a specified circuit operating abnormally due to capacitor 21 no longer meeting the required quality.

[0018] In addition, the electronic circuit board 1 may be constructed by mounting the photocoupler 11 on a first wiring board, mounting the capacitor 21 on a second wiring board different from the first wiring board, and connecting the first wiring board and the second wiring board with a cable or a BtoB connector.

[0019] Fig. 3 is a diagram showing a specific configuration example of the electronic circuit board 1. In Fig. 3, the same components as those in Fig. 1 are assigned the same reference numerals. As shown in Fig. 3, the electronic circuit board 1 includes a power supply control circuit 10 and a DC / DC conversion circuit 20. In practice, the electronic circuit board 1 is configured by mounting electronic components corresponding to the components of the power supply control circuit 10 and the components of the DC / DC conversion circuit 20 on a wiring board on which various wirings are formed.

[0020] The power supply control circuit 10 includes a photocoupler 11, a P-channel MOSFET 12, a bipolar transistor 13, and four resistors 14, 15, 16, and 17. MOSFET is an abbreviation for Metal Oxide Semiconductor Field Effect Transistor.

[0021] The photocoupler 11 has a light-emitting diode 111 which is a light-emitting element, and a phototransistor 112 which is a light-receiving element, and when a current flows from the anode to the cathode of the light-emitting diode 111, the light is emitted, and when this light is received, electrical conduction occurs between the collector and emitter of the phototransistor 112. The anode of the light-emitting diode 111 is connected to one end of a resistor 14, and the cathode is connected to the collector of the bipolar transistor 13. The collector of the phototransistor 112 is connected to one end of a resistor 16, and the emitter is grounded.

[0022] The other end of resistor 16 is connected to one end of resistor 15 and the gate terminal of MOSFET 12, and the other ends of resistor 14 and resistor 15 are connected to node N1, to which power supply voltage VIN is supplied. The source terminal of MOSFET 12 is connected to node N1, and the drain terminal of MOSFET 12 is connected to node N2. The emitter of bipolar transistor 13 is grounded, and an enable signal EN at an H level or an L level is input to the base of bipolar transistor 13 via resistor 17. The H level of the enable signal EN is a voltage close to the power supply voltage VIN, and the L level of the enable signal EN is a voltage close to the ground voltage GND. The enable signal EN may be input from outside the electronic circuit board 1, or the electronic circuit board 1 may be provided with a circuit that outputs the enable signal EN based on a signal input from outside.

[0023] Therefore, when the enable signal EN is at H level, conduction occurs between the collector and emitter of the bipolar transistor 13, and a current flows from node N1 to ground via resistor 14 and light-emitting diode 111. This causes the light-emitting diode 111 to emit light, and conduction occurs between the collector and emitter of the phototransistor 112. As a result, a current flows from node N1 to ground via two resistors 15 and 16 and phototransistor 112, and the voltage of the gate terminal of MOSFET 12 becomes lower than the power supply voltage VIN, so that conduction occurs between the source terminal and drain terminal of MOSFET 12 and the power supply voltage VIN is supplied to node N2.

[0024] On the other hand, when the enable signal EN is at an L level, no current flows through the light-emitting diode 111 and it does not emit light, so there is no conduction between the collector and emitter of the phototransistor 112, there is no conduction between the source terminal and drain terminal of the MOSFET 12, and the power supply voltage VIN is not supplied to the node N2.

[0025] When the photocoupler 11 reaches the end of its life, the enable signal EN is at H level. Even if the power supply voltage VOUT is supplied to the DC / DC converter circuit 20 including the capacitor 21 and the circuit to which the power supply voltage VOUT is supplied, the DC / DC converter circuit 20 including the capacitor 21 and the circuit to which the power supply voltage VOUT is supplied are less likely to operate abnormally due to the capacitor 21 no longer satisfying predetermined quality due to deterioration over time.

[0026] The DC / DC conversion circuit 20 includes a capacitor 21 , an inductor 22 , a diode 23 , a P-channel MOSFET 24 , two resistors 25 and 26 , and a control unit 27 .

[0027] The source terminal of the MOSFET 24 is connected to node N2, and the drain terminal of the MOSFET 24, the cathode terminal of the diode 23, and one end of the inductor 22 are connected to node N3. The other end of the inductor 22, one end of the capacitor 21, and one end of the resistor 25 are connected to node N4. The other end of the resistor 25 is connected to one end of the resistor 26, and the other end of the capacitor 21, the anode terminal of the diode 23, and the other end of the resistor 26 are grounded.

[0028] The control unit 27 is connected between the node N2 and the ground, and outputs a control signal DRV that becomes either an H level or an L level based on the voltage VFB of a node N5 to which the other end of the resistor 25 and one end of the resistor 26 are connected. The H level of the control signal DRV is a voltage close to the power supply voltage VIN supplied to the node N2, and the L level of the control signal DRV is a voltage close to the ground voltage GND. The control unit 27 compares the voltage VFB with a predetermined target voltage and controls the on-duty of the control signal DRV based on the comparison result.

[0029] A control signal DRV output from the control unit 27 is input to the gate terminal of the MOSFET 24. When the control signal DRV is at H level, there is no conduction between the source terminal and the drain terminal of the MOSFET 24. On the other hand, when the control signal DRV is at L level, there is conduction between the source terminal and the drain terminal of the MOSFET 24, and the power supply voltage VIN supplied to the node N2 is supplied to the node N3.

[0030] Inductor 22 stores energy based on power supply voltage VIN supplied to node N3 during a period when conduction occurs between the source terminal and drain terminal of MOSFET 24, and releases the stored energy during a period when conduction does not occur between the source terminal and drain terminal of MOSFET 24. Diode 23 feeds back to node N3 the energy released by inductor 22 during a period when conduction does not occur between the source terminal and drain terminal of MOSFET 24. Capacitor 21 smoothes the energy output by inductor 22, thereby generating power supply voltage VOUT at node N4.

[0031] The DC / DC conversion circuit 20 configured as described above is a switching regulator that steps down the power supply voltage VIN to a power supply voltage VOUT that is lower than the power supply voltage VIN and outputs the power supply voltage VOUT by switching the MOSFET 24. The power supply voltage VOUT is controlled by the switching duty ratio of the MOSFET 24, i.e., the duty ratio between the H level and the L level of the control signal DRV.

[0032] 3, a power supply circuit board having a DC / DC conversion circuit 20 including a capacitor 21 in the subsequent stage of the power supply control circuit 10 is exemplified as an example of a specific configuration of the electronic circuit board 1, but the electronic circuit board 1 may be a power supply circuit board having a DC / DC conversion circuit or an AC / DC conversion circuit in the previous stage of the power supply control circuit 10. Alternatively, the electronic circuit board 1 may be a power supply circuit board having a DC / DC conversion circuit or an AC / DC conversion circuit in the previous stage of the power supply control circuit 10. For example, the electronic circuit board 1 may be a relay board that includes a power supply control circuit 10 and a capacitor 21 between the node N2 and the ground, and that controls whether or not power supplied from outside the electronic circuit board 1 is supplied to the capacitor 21 and a circuit outside the electronic circuit board 1.

[0033] In the electronic circuit board 1 of the present embodiment described above, the photocoupler 11 stops operating normally before the capacitor 21 no longer meets the required quality due to deterioration over time, and power is not supplied to the required circuit including the capacitor 21. Therefore, the electronic circuit board 1 of the present embodiment reduces the risk of damage to electronic components due to unexpected operation of the required circuit caused by quality defects due to deterioration over time of the capacitor 21 when power is applied, thereby improving safety when power is applied. Furthermore, the electronic circuit board 1 of the present embodiment does not require a special circuit, such as a current prevention circuit, to ensure safety even if quality defects occur in the capacitor 21 due to deterioration over time.

[0034] Furthermore, according to the electronic circuit board 1 of this embodiment, the risk of electronic components being damaged due to unexpected operation of a specified circuit caused by deterioration of the capacitor 21 over time is reduced, so that the minimum number of electronic components that are known to have a short lifespan can be replaced and reused.

[0035] Furthermore, electrolytic capacitors have a larger capacitance and are less expensive than ceramic capacitors, but have a shorter lifespan than ceramic capacitors, and the lifespan varies depending on the environment, such as the operating temperature. Therefore, when an electrolytic capacitor is used as capacitor 21, problems are likely to occur due to quality defects caused by deterioration over time. However, with electronic circuit board 1 of this embodiment, photocoupler 11 will no longer function properly and power will not be supplied to the specified circuit including capacitor 21 before capacitor 21 no longer meets the required quality due to deterioration over time, thereby improving safety.

[0036] Furthermore, according to the electronic circuit board 1 of this embodiment, even if it is not possible to obtain a photocoupler 11 with a shorter lifespan than the capacitor 21, the lifespan of the photocoupler 11 can be made shorter than the lifespan of the capacitor 21 by aging treatment, and therefore safety can be improved by using the aged photocoupler 11.

[0037] 2.Recycled electronic circuit board FIG. 4 is a diagram showing a schematic configuration of a recycled electronic circuit board according to this embodiment. As shown in FIG. 4, the recycled electronic circuit board 1A according to this embodiment includes a power supply control circuit 10A having a photocoupler 11A and a capacitor 21A. The recycled electronic circuit board 1A is a recycled electronic circuit board obtained by replacing the capacitor 21 and photocoupler 11 provided on the electronic circuit board 1 shown in FIG. 1 with capacitor 21A and photocoupler 11A, respectively. The capacitor 21 is an example of a "first capacitor," and the photocoupler 11 is an example of a "first photocoupler." The capacitor 21A is an example of a "second capacitor," and the photocoupler 11A is an example of a "second photocoupler." Note that, of the many electronic components mounted on the wiring board of the electronic circuit board 1, the recycled electronic circuit board 1A may also include other electronic components replaced in addition to the capacitor 21 and photocoupler 11.

[0038] The power supply control circuit 10A has a photocoupler 11A and controls the supply of power to a predetermined circuit including a capacitor 21A. When the photocoupler 11A is energized in response to power supplied from outside the recycled electronic circuit board 1A and operates normally, the power supply control circuit 10A supplies power to the predetermined circuit, causing the capacitor 21A to enter a conductive state. When the photocoupler 11A does not operate normally, the power supply control circuit 10A By not supplying power to this circuit, the capacitor 21A is not energized. Here, "the photocoupler 11A operates normally" may mean, for example, that the current transfer ratio CTR of the photocoupler 11A during operation is equal to or greater than a predetermined threshold value.

[0039] 4, for example, a power supply voltage V IN based on power supplied from outside the recycled electronic circuit board 1A is input to a power supply control circuit 10A, and the supply of the power supply voltage V IN to a predetermined circuit including a capacitor 21A is controlled by the operation of a photocoupler 11A. The power supply voltage V IN may be input from outside the recycled electronic circuit board 1A, or the recycled electronic circuit board 1A may be provided with a power supply circuit that outputs the power supply voltage V IN based on power supplied from outside.

[0040] Normal operation of the photocoupler 11A is guaranteed until the energization time reaches the first time t1. Conversely, once the energization time reaches the first time t1, normal operation of the photocoupler 11A is no longer guaranteed and the photocoupler 11A reaches the end of its life. As time passes, the light emission amount of the light-emitting element of the photocoupler 11A decreases, and as a result, the current transfer ratio CTR decreases. Then, once the energization time reaches the first time t1, the current transfer ratio CTR of the photocoupler 11A decreases to a predetermined threshold, normal operation of the photocoupler 11A is no longer guaranteed, and the photocoupler 11A reaches the end of its life.

[0041] The predetermined quality of capacitor 21A is guaranteed until the energization time reaches second time t2. Conversely, when the energization time reaches second time t2, the predetermined quality of capacitor 21A is no longer guaranteed and the capacitor reaches the end of its life. The "predetermined quality of capacitor 21A" may be, for example, that the capacitance of capacitor 21A is equal to or greater than a predetermined threshold. The capacitance of capacitor 21A decreases over time. Then, when the energization time reaches second time t2, the capacitance of capacitor 21A decreases to the predetermined threshold, the predetermined quality of capacitor 21A is no longer guaranteed, and the capacitor reaches the end of its life. Capacitor 21A may be, for example, an electrolytic capacitor, or may be an aluminum electrolytic capacitor.

[0042] Here, the first time t1 is shorter than the second time t2. For example, the photocoupler 11A may be subjected to an aging process so that the first time t1 is shorter than the second time t2. The aging process is, for example, a process of accelerating the deterioration of the photocoupler 11A by passing current through the photocoupler 11A. The photocoupler 11A and the capacitor 21A tend to have shorter lifespans than other electronic components, and furthermore, the lifespan of the photocoupler 11A is shorter than the lifespan of the capacitor 21A.

[0043] As described above, when photocoupler 11A is energized and operates normally, capacitor 21A is energized, so the energization time of photocoupler 11A is approximately equal to the energization time of capacitor 21A. In this case, because first time t1 is shorter than second time t2, photocoupler 11A will reach the end of its life before capacitor 21A and will no longer operate normally. Furthermore, if photocoupler 11A does not operate normally, power will not be supplied to a specific circuit, so power will not be supplied to a specific circuit after capacitor 21A reaches the end of its life. This reduces the risk of a specific circuit operating abnormally due to capacitor 21A no longer meeting the required quality.

[0044] In addition, the reproduced electronic circuit board 1A may be constructed by mounting the photocoupler 11A on a first wiring board, mounting the capacitor 21A on a second wiring board different from the first wiring board, and connecting the first wiring board and the second wiring board with a cable or a BtoB connector.

[0045] FIG. 5 is a diagram showing a specific example of the configuration of a regenerated electronic circuit board 1A. In FIG. 5, the same components as those in FIG. 3 and FIG. 4 are denoted by the same reference numerals. As shown, the recycled electronic circuit board 1A includes a power supply control circuit 10A and a DC / DC conversion circuit 20A. In practice, the recycled electronic circuit board 1A is configured by mounting electronic components corresponding to the components of the power supply control circuit 10A and the DC / DC conversion circuit 20A on a wiring board on which various types of wiring are formed.

[0046] The power supply control circuit 10A is different from the power supply control circuit 10 in Fig. 3 in that the photocoupler 11 is replaced with a photocoupler 11A, and therefore a description of its configuration and operation will be omitted. Similarly, the DC / DC conversion circuit 20A is different from the DC / DC conversion circuit 20 in Fig. 3 in that the capacitor 21 is replaced with a capacitor 21A, and therefore a description of its configuration and operation will be omitted.

[0047] When photocoupler 11A reaches the end of its life, even if enable signal EN is at the H level, light-emitting diode 111A does not emit light, or the light-emitting diode 111A emits only a small amount of light, causing a discontinuity between the collector and emitter of phototransistor 112A. As a result, no current flows from node N1 to ground via two resistors 15 and 16 and phototransistor 112A, and the voltage at the gate terminal of MOSFET 12 becomes power supply voltage V. This prevents continuity between the source and drain terminals of MOSFET 12, preventing power supply voltage V from being supplied to node N2. This reduces the risk of abnormal operation of DC / DC conversion circuit 20A including capacitor 21A or a circuit to which power supply voltage VOUT is supplied, due to capacitor 21A no longer satisfying a predetermined quality due to deterioration over time.

[0048] 5 shows an example of a specific configuration of the recycled electronic circuit board 1A, which is a power supply circuit board having a DC / DC conversion circuit 20A including a capacitor 21A downstream of the power supply control circuit 10A. However, the recycled electronic circuit board 1A may also be a power supply circuit board having a DC / DC conversion circuit or an AC / DC conversion circuit upstream of the power supply control circuit 10A. Alternatively, the recycled electronic circuit board 1A does not have to be a power supply circuit board. For example, the recycled electronic circuit board 1A may be a relay board having the power supply control circuit 10A and a capacitor 21A between node N2 and ground, and the power supply control circuit 10A controls whether power supplied from outside the recycled electronic circuit board 1A is supplied to the capacitor 21A and a circuit external to the recycled electronic circuit board 1A.

[0049] In the recycled electronic circuit board 1A of this embodiment described above, before the capacitor 21A no longer meets the required quality due to degradation over time, the photocoupler 11A stops operating normally, and power is not supplied to the specified circuit including the capacitor 21A. Therefore, the recycled electronic circuit board 1A of this embodiment reduces the risk of damage to electronic components due to unexpected operation of the specified circuit caused by quality defects due to degradation of the capacitor 21A over time when power is applied, thereby improving safety when power is applied. Furthermore, the recycled electronic circuit board 1A of this embodiment does not require a special circuit, such as a current prevention circuit, to ensure safety even if quality defects occur in the capacitor 21A due to degradation over time.

[0050] Furthermore, according to the recycled electronic circuit board 1A of this embodiment, by replacing the capacitor 21 and the photocoupler 11 with the capacitor 21A and the photocoupler 11A, respectively, and reusing the electronic circuit board 1, it is possible to set the product life and quality guarantee period as long as those of a new product.

[0051] Furthermore, when an electrolytic capacitor is used as the capacitor 21A, problems are likely to occur due to quality defects caused by deterioration over time. However, with the recycled electronic circuit board 1A of this embodiment, before the capacitor 21A no longer meets the required quality due to deterioration over time, the photocoupler 11A will no longer operate normally, and power will not be supplied to the required circuit including the capacitor 21A. Therefore, safety can be improved.

[0052] Furthermore, according to the recycled electronic circuit board 1A of this embodiment, even if it is not possible to obtain a photocoupler 11A with a shorter lifespan than the capacitor 21A, the lifespan of the photocoupler 11A can be made shorter than the lifespan of the capacitor 21A by aging treatment, and therefore safety can be improved by using the aged photocoupler 11A.

[0053] 3. Production method for recycled electronic circuit boards As described above, the recycled electronic circuit board 1A is produced by reusing the electronic circuit board 1. Fig. 6 is a flowchart showing an example of the steps of the method for producing the recycled electronic circuit board 1A. As shown in Fig. 6, first, in step S1, an operator supplies power to the electronic circuit board 1 equipped with the capacitor 21 and the photocoupler 11.

[0054] If the photocoupler 11 does not operate normally in step S2, the worker replaces the capacitor 21 and the photocoupler 11 with a capacitor 21A and a photocoupler 11A, respectively, in step S3. This allows the wiring board of the electronic circuit board 1 to be reused, and a recycled electronic circuit board 1A is obtained in which the capacitor 21A and the photocoupler 11A are mounted on the wiring board.

[0055] On the other hand, if the photocoupler 11 operates normally in step S2, the worker does not need to replace the capacitor 21 and the photocoupler 11.

[0056] Finally, in step S4, the worker checks the operation of the electronic circuit board 1 or the recycled electronic circuit board 1A. If any electronic components are found to be defective as a result of the check, they are replaced.

[0057] According to the method for producing recycled electronic circuit boards 1A of the present embodiment described above, in electronic circuit board 1, photocoupler 11 stops operating normally and power is not supplied to a predetermined circuit including capacitor 21 before capacitor 21 no longer meets the predetermined quality due to deterioration over time. This makes it easy to determine the lifespan of electronic circuit board 1, and recycled electronic circuit boards 1A can be produced by reusing electronic circuit boards 1 that have reached the end of their lifespan.

[0058] In particular, if it takes a long time for electronic circuit board 1 to be reused, quality deterioration will progress further due to a decrease in the capacitance of capacitor 21. However, according to the production method for recycled electronic circuit board 1A of this embodiment, if photocoupler 11 does not operate normally even when power is supplied to electronic circuit board 1 for an operation check or the like, power will not be supplied to a predetermined circuit including capacitor 21, reducing the risk of damage to electronic components included in the predetermined circuit, thereby improving safety. Therefore, workers can easily identify electronic components that need to be replaced, and only need to replace the minimum number of electronic components, including capacitor 21 and photocoupler 11, whose lifespans are known to be short. This reduces the time required to produce recycled electronic circuit boards 1A and allows recycled electronic circuit boards 1A to be produced inexpensively.

[0059] Furthermore, when an electrolytic capacitor is used as capacitor 21, problems are likely to occur due to quality defects caused by deterioration over time. However, according to the method for producing recycled electronic circuit board 1A of this embodiment, if photocoupler 11 does not operate normally even when power is supplied to electronic circuit board 1 for purposes such as checking operation, power will not be supplied to a specified circuit including capacitor 21, reducing the risk of damage to electronic components included in the specified circuit, thereby improving safety in the production process.

[0060] Furthermore, in the method for producing the recycled electronic circuit board 1A of this embodiment, the capacitor 21 has a longer life than the capacitor 21. Even if photocouplers 11 with a short lifespan are unavailable, the aging treatment can be used to shorten the lifespan of the photocouplers 11 in the electronic circuit board 1 to be shorter than the lifespan of the capacitors 21. Therefore, according to the method for producing recycled electronic circuit boards 1A of this embodiment, safety in the production process can be improved by reusing electronic circuit boards 1 having aging-treated photocouplers 11.

[0061] 4.Electronic equipment Next, a liquid ejection device 200 will be described as an example of an electronic device including the above-described electronic circuit board 1 or recycled electronic circuit board 1A. Fig. 7 is a diagram showing an example of the structure of the liquid ejection device 200. As shown in Fig. 7, the liquid ejection device 200 includes a moving body 202 and a moving unit 203 that moves the moving body 202 back and forth along a scanning axis.

[0062] The moving unit 203 has a carriage motor 231 that serves as a drive source for the reciprocating movement of the moving body 202 along the scanning axis, a carriage guide shaft 232 with both ends fixed, and a timing belt 233 that extends approximately parallel to the carriage guide shaft 232 and is driven by the carriage motor 231. The moving body 202 also has a print head 220 that ejects ink, and a carriage 224 on which the print head 220 is mounted.

[0063] The carriage 224 is supported by a carriage guide shaft 232 so as to be able to move back and forth, and is fixed to a part of a timing belt 233. The carriage 224 moves back and forth while being guided by the carriage guide shaft 232 as the timing belt 233 runs forward and backward by a carriage motor 231. The carriage 224 is also equipped with a plurality of ink cartridges 226 that store ink to be ejected onto the medium P.

[0064] The print head 220 is located at a portion of the movable body 202 that faces the medium P. Nozzles that eject ink supplied from ink cartridges 226 are provided on the surface of the print head 220 that faces the medium P. A cable 290 is also electrically connected to the print head 220. Various control signals that control the operation of the print head 220 are input to the print head 220 via the cable 290. A flexible flat cable that can slide in accordance with the reciprocating movement of the movable body 202 can be used as this cable 290.

[0065] The liquid ejection device 200 also includes a transport unit 204 that transports the medium P. The transport unit 204 has a platen 240 that supports the medium P, a transport motor 241 that functions as a drive source for transporting the medium P, and transport rollers 242 that transport the medium P by rotating when driven by the transport motor 241. The transport unit 204 transports the medium P in a predetermined transport direction when the transport motor 241 is driven.

[0066] In the liquid ejection device 200 configured as described above, the medium P is transported in a predetermined transport direction under the control of the transport unit 204, and the carriage 224 carrying the print head 220 moves back and forth along the scanning axis under the control of the moving unit 203. The print head 220 mounted on the carriage 224 ejects ink in synchronization with the timing at which the medium P is transported and the timing at which the moving body 202 moves back and forth. As a result, the ink ejected by the print head 220 lands at the desired position on the medium P, forming the desired image or characters on the medium P.

[0067] Next, the functional configuration of the liquid ejection device 200 will be described. Fig. 8 is a diagram showing an example of the functional configuration of the liquid ejection device 200. As shown in Fig. 8, the liquid ejection device 200 includes a control unit 210, a print head 220, a moving unit 203, and a transport unit 204. The control unit 210 and the print head 220 are electrically connected by a cable 290. As a result, various signals output by the control unit 210 are input to the print head 220.

[0068] The control unit 210 includes a control circuit 211, an AC / DC conversion circuit 212, and the electronic circuit board 1 having the power supply control circuit 10 and the DC / DC conversion circuit 20.

[0069] A commercial AC voltage VAC is input to the AC / DC conversion circuit 212 from outside the liquid ejection device 200. The AC / DC conversion circuit 212 generates and outputs a voltage VH, which is a constant DC voltage of, for example, 42 V, from the input commercial AC voltage VAC.

[0070] The power supply control circuit 10 receives the voltage VH output by the AC / DC conversion circuit 212, and when the enable signal EN output by the control circuit 211 is at H level, supplies the voltage VH to the DC / DC conversion circuit 20. The DC / DC conversion circuit 20 converts the 42V voltage VH into a voltage VDD, which is a direct current voltage of, for example, 5V or 3.3V, and outputs the converted voltage. The voltage VH output by the AC / DC conversion circuit 212 and the voltage VDD output by the DC / DC conversion circuit 20 are used as power supply voltages for the various components of the liquid ejection device 200. Here, the voltage VH corresponds to the power supply voltage VIN described above, and the voltage VDD corresponds to the power supply voltage VOUT described above.

[0071] Image data is input to the control circuit 211 from an external device (not shown), such as a host computer, that is provided outside the liquid ejection device 200. The control circuit 211 performs various types of image processing on the input image data, thereby generating various control signals for controlling each part of the liquid ejection device 200 and outputting them to the corresponding components.

[0072] Specifically, the control circuit 211 generates a control signal Ctrl1 for controlling the reciprocating movement of the movable body 202 and outputs it to a carriage motor 231 included in the moving unit 203. This drives the carriage motor 231, controlling the reciprocating movement of the movable body 202 along the scanning direction. The control circuit 211 also generates a control signal Ctrl2 for controlling the transport of the medium P and outputs it to a transport motor 241 included in the transport unit 204. This drives the transport motor 241, controlling the transport of the medium P along the transport direction.

[0073] The control circuit 211 also outputs a basic drive signal dA, which is a digital signal, to the drive circuit 250. The drive circuit 250 converts the input digital basic drive signal dA into an analog signal, and then generates an ejection drive signal COM by D-class amplifying the analog signal, and outputs it to the print head 220.

[0074] Furthermore, the control circuit 211 generates ejection control signals DATA for controlling the ejection of ink from the print head 220 based on the input image data, and outputs the signals to the print head 220 .

[0075] The control circuit 211 also generates an enable signal EN and outputs it to the power supply control circuit 10.

[0076] The print head 220 includes a drive signal selection circuit 221 and a plurality of ejection sections 600 .

[0077] The drive signal selection circuit 221 receives as input the ejection control signal DATA output by the control circuit 211 and the ejection drive signal COM output by the drive circuit 250. Based on the input ejection control signal DATA, the drive signal selection circuit 221 selects or deselects a signal waveform included in the ejection drive signal COM, thereby generating an ejection drive signal VDP corresponding to each of the multiple ejection sections 600. The drive signal selection circuit 221 then outputs the generated ejection drive signal VDP to one end of the piezoelectric element 60 of the corresponding ejection section 600.

[0078] At this time, a reference voltage VBS is input to the other end of the piezoelectric element 60 of each of the multiple ejection units 600. The reference voltage VBS is a DC voltage with a constant voltage value, such as ground voltage, 5.5 V, or 6 V, and functions as a reference for driving the piezoelectric elements 60. The piezoelectric element 60 of each of the multiple ejection units 600 is driven in response to the potential difference between the ejection drive signal VDP supplied to one end and the reference voltage VBS supplied to the other end. Then, an amount of ink corresponding to the drive of the piezoelectric element 60 is ejected from the ejection unit 600.

[0079] The liquid ejection device 200 configured as described above includes the electronic circuit board 1, so that the photocoupler 11 reaches the end of its life before the capacitor 21 reaches the end of its life, causing the control unit 210 and the print head 220 to stop operating. This reduces the risk of the capacitor 21 reaching the end of its life and causing the control unit 210 and the print head 220 to malfunction. Note that the control unit 210 of the liquid ejection device 200 may include the above-mentioned recycled electronic circuit board 1A having the power supply control circuit 10A and the DC / DC conversion circuit 20A, instead of the electronic circuit board 1.

[0080] The electronic device is not limited to the liquid ejection device 200, but may be any electronic device that includes a circuit for converting voltage values. Examples of such electronic devices include notebook computers, e-book players, mobile phones, cordless phone handsets, fax machines, copy machines, LCD televisions, handheld vacuum cleaners, portable CD players, radios, lighting equipment, toys, game devices, cameras, and medical equipment.

[0081] The present invention includes configurations that are substantially the same as the configurations described in this embodiment, for example, configurations with the same functions, methods, and results, or configurations with the same purpose and effects. The present invention also includes configurations in which non-essential parts of the configurations described in this embodiment are replaced. The present invention also includes configurations that achieve the same effects or purposes as the configurations described in this embodiment. The present invention also includes configurations in which publicly known technology is added to the configurations described in this embodiment.

[0082] The above-described embodiment and modifications are merely examples, and the present invention is not limited to these. For example, the embodiments and modifications can be combined as appropriate.

[0083] The following can be derived from the above-described embodiment and modifications.

[0084] One aspect of the electronic circuit board is A capacitor and a power supply control circuit having a photocoupler and controlling the supply of power to a predetermined circuit including the capacitor; Equipped with When the photocoupler is energized in response to the externally supplied power and operates normally, the power supply control circuit supplies power to the predetermined circuit, causing the capacitor to enter a conductive state, When the photocoupler does not operate normally, the power supply control circuit does not supply power to the predetermined circuit, and the capacitor does not enter a conducting state, The photocoupler is guaranteed to operate normally until the power-on time reaches the first time, The capacitor is guaranteed to maintain a predetermined quality until the energization time reaches a second time, The first time period is less than the second time period.

[0085] In this electronic circuit board, before the capacitors begin to deteriorate over time and no longer meet the required quality, the photocouplers will no longer function properly, preventing power from being supplied to the specified circuitry including the capacitors. Therefore, with this electronic circuit board, the risk of damage to electronic components due to unexpected operation of a predetermined circuit caused by quality defects due to aging of the capacitor when current is applied is reduced, thereby improving safety when current is applied. Furthermore, with this electronic circuit board, there is no need to provide a special circuit such as a current prevention circuit to ensure safety even if quality defects occur in the capacitor due to aging.

[0086] Furthermore, this electronic circuit board reduces the risk of electronic components being damaged due to unexpected operation of a specified circuit caused by deterioration of the capacitor over time, making it possible to replace and reuse the minimum number of electronic components that are known to have a short lifespan.

[0087] In one embodiment of the electronic circuit board, The capacitor may be an electrolytic capacitor.

[0088] Electrolytic capacitors have a larger capacitance and are less expensive than ceramic capacitors, but they have a shorter lifespan than ceramic capacitors and their lifespan varies depending on the environment, such as the temperature at which they are used. As a result, electrolytic capacitors are prone to malfunction due to quality defects caused by deterioration over time. However, with this electronic circuit board, the photocoupler will no longer function properly and power will not be supplied to the specified circuit including the capacitor before the capacitor no longer meets the required quality due to deterioration over time, thereby improving safety.

[0089] In one embodiment of the electronic circuit board, The photocoupler may be subjected to an aging treatment so that the first time period is shorter than the second time period.

[0090] With this electronic circuit board, even if a photocoupler with a shorter lifespan than that of a capacitor is not available, the lifespan of the photocoupler can be made shorter than that of the capacitor by aging treatment, and therefore safety can be improved by using an aged photocoupler.

[0091] One aspect of the recycled electronic circuit board is: A regenerated electronic circuit board that has been regenerated by replacing a first capacitor and a first photocoupler that were provided on the electronic circuit board with a second capacitor and a second photocoupler, respectively, the second capacitor; a power supply control circuit having the second photocoupler and controlling the supply of power to a predetermined circuit including the second capacitor; Equipped with When the second photocoupler is energized in response to the externally supplied power and operates normally, the power supply control circuit supplies power to the predetermined circuit, causing the second capacitor to enter an energized state, When the second photocoupler does not operate normally, the power supply control circuit does not supply power to the predetermined circuit, and therefore the second capacitor does not enter a conducting state; The second photocoupler is guaranteed to operate normally until the power-on time reaches the first time, the second capacitor is guaranteed to maintain a predetermined quality until the energization time reaches a second time; The first time period is less than the second time period.

[0092] In this recycled electronic circuit board, the second photocoupler stops working properly before the second capacitor no longer meets the required quality due to deterioration over time, and power is not supplied to the required circuit including the second capacitor. Therefore, with this recycled electronic circuit board, when power is applied, the required circuit will not operate unexpectedly due to quality defects caused by deterioration of the second capacitor over time. This reduces the risk of damage to electronic components, improving safety when electricity is applied. Furthermore, with this recycled electronic circuit board, there is no need to install a special circuit such as a current prevention circuit to ensure safety even if the second capacitor becomes defective due to deterioration over time.

[0093] Furthermore, with this recycled electronic circuit board, the first capacitor and the first photocoupler can be replaced with the second capacitor and the second photocoupler, respectively, and the electronic circuit board can be reused, thereby enabling the product life and quality guarantee period to be set as long as those of a new product.

[0094] In one embodiment of the recycled electronic circuit board, The second capacitor may be an electrolytic capacitor.

[0095] Electrolytic capacitors have a larger capacitance and are less expensive than ceramic capacitors, but they have a shorter lifespan than ceramic capacitors and their lifespan varies depending on the environment, such as the operating temperature. As a result, electrolytic capacitors are prone to malfunction due to quality defects caused by deterioration over time. However, with this recycled electronic circuit board, the second photocoupler will stop operating normally before the second capacitor no longer meets the required quality due to deterioration over time, preventing power from being supplied to the specified circuit including the second capacitor, thereby improving safety.

[0096] In one embodiment of the recycled electronic circuit board, The second photocoupler may be subjected to an aging treatment so that the first time period is shorter than the second time period.

[0097] With this recycled electronic circuit board, even if it is not possible to obtain a second photocoupler with a shorter lifespan than the second capacitor, the lifespan of the second photocoupler can be made shorter than the lifespan of the second capacitor by aging treatment, and therefore safety can be improved by using the aged second photocoupler.

[0098] One aspect of a method for producing recycled electronic circuit boards includes: a power supply control circuit having a first capacitor and a first photocoupler and controlling supply of power to a predetermined circuit including the first capacitor, wherein when the first photocoupler is energized in response to power supplied from an external source and operates normally, the power supply control circuit supplies power to the predetermined circuit, causing the first capacitor to be energized; when the first photocoupler does not operate normally, the power supply control circuit does not supply power to the predetermined circuit, causing the first capacitor not to be energized; the first photocoupler is guaranteed to operate normally until a first period of time has passed; and the first capacitor is guaranteed to maintain a predetermined quality until a second period of time has passed; and the first period of time is shorter than the second period of time. providing power to the electronic circuit board; and if the first photocoupler does not operate normally, replacing the first capacitor and the first photocoupler with a second capacitor and a second photocoupler, respectively.

[0099] According to this method for producing recycled electronic circuit boards, the first photocoupler in the electronic circuit board stops operating normally and power is not supplied to a specific circuit including the first capacitor before the first capacitor no longer meets the specified quality due to deterioration over time. This makes it easy to determine the end of the life of the electronic circuit board, and allows recycled electronic circuit boards to be produced by reusing electronic circuit boards that have reached the end of their life.

[0100] In particular, if it takes a long time for the electronic circuit board to be reused, the quality of the first capacitor will deteriorate further, but according to this method for producing recycled electronic circuit boards, if the first photocoupler does not operate normally even when power is supplied to the electronic circuit board for an operation check, etc., power will not be supplied to a predetermined circuit including the first capacitor, reducing the risk of damage to the electronic components included in the predetermined circuit, thereby improving safety. Therefore, workers can easily identify the electronic components that need to be replaced, and only need to replace the minimum number of electronic components, including the first capacitor and the first photocoupler, that are known to have short lifespans. This reduces the time required to produce recycled electronic circuit boards and allows recycled electronic circuit boards to be produced inexpensively.

[0101] In one embodiment of the method for producing recycled electronic circuit boards, The first capacitor may be an electrolytic capacitor.

[0102] Electrolytic capacitors have a larger capacitance and are less expensive than ceramic capacitors, but they have a shorter lifespan than ceramic capacitors, and their lifespan varies depending on the environment, such as the operating temperature. As a result, electrolytic capacitors are prone to malfunction due to quality defects caused by deterioration over time. However, with this method for producing recycled electronic circuit boards, if the first photocoupler does not operate normally even when power is supplied to the electronic circuit board for an operation check or the like, power will not be supplied to a specified circuit including the first capacitor, reducing the risk of damage to electronic components included in the specified circuit, thereby improving safety in the production process.

[0103] In one embodiment of the method for producing recycled electronic circuit boards, The first photocoupler may be subjected to an aging treatment so that the first time period is shorter than the second time period.

[0104] With this method for producing recycled electronic circuit boards, even if a first photocoupler with a shorter lifespan than the first capacitor is unavailable, the lifespan of the first photocoupler in the electronic circuit board can be made shorter than the lifespan of the first capacitor by aging treatment. Therefore, with this method for producing recycled electronic circuit boards, safety in the production process can be improved by reusing electronic circuit boards having aging-treated first photocouplers. [Explanation of symbols]

[0105] 1...electronic circuit board, 1A...recycled electronic circuit board, 10,10A...power supply control circuit, 11,11A...photocoupler, 12...MOSFET, 13...bipolar transistor, 14,15,16,17...resistor, 20,20A...DC / DC conversion circuit, 21,21A...capacitor, 22...inductor, 23...diode, 24...MOSFET, 25,26...resistor, 27...control unit, 60...piezoelectric element, 200...liquid ejection device, 202...moving body, 203...moving unit, 204... Transport unit, 210...control unit, 211...control circuit, 212...AC / DC conversion circuit, 220...print head, 221...drive signal selection circuit, 224...carriage, 226...ink cartridge, 231...carriage motor, 232...carriage guide shaft, 233...timing belt, 240...platen, 241...transport motor, 242...transport roller, 250...drive circuit, 290...cable, 600...ejection unit, N1, N2, N3, N4, N5...node, P...medium

Claims

1. A capacitor and a power supply control circuit having a photocoupler and controlling the supply of power to a predetermined circuit including the capacitor; Equipped with When the photocoupler is energized in response to the externally supplied power and operates normally, the power supply control circuit supplies power to the predetermined circuit, causing the capacitor to enter a conductive state, When the photocoupler does not operate normally, the power supply control circuit does not supply power to the predetermined circuit, and the capacitor does not enter a conducting state, The photocoupler is guaranteed to operate normally until the energization time reaches a first time period, The capacitor is guaranteed to maintain a predetermined quality until the energization time reaches a second time, The first time period is shorter than the second time period. An electronic circuit board comprising:

2. The capacitor is an electrolytic capacitor.

2. The electronic circuit board according to claim 1.

3. the photocoupler is subjected to an aging treatment so that the first time is shorter than the second time; 3. The electronic circuit board according to claim 1 or 2.

4. A regenerated electronic circuit board that has been regenerated by replacing a first capacitor and a first photocoupler provided on the electronic circuit board with a second capacitor and a second photocoupler, respectively, the second capacitor; a power supply control circuit having the second photocoupler and controlling the supply of power to a predetermined circuit including the second capacitor; Equipped with When the second photocoupler is energized in response to the power supplied from the outside and operates normally, the power supply control circuit supplies power to the predetermined circuit, thereby energizing the second capacitor, When the second photocoupler does not operate normally, the power supply control circuit does not supply power to the predetermined circuit, and therefore the second capacitor does not enter a conducting state; the second photocoupler is guaranteed to operate normally until the energization time reaches the first time; the second capacitor is guaranteed to have a predetermined quality until the energization time reaches a second time; The first time period is shorter than the second time period. A recycled electronic circuit board.

5. The second capacitor is an electrolytic capacitor.

5. The regenerated electronic circuit board according to claim 4.

6. the second photocoupler is subjected to an aging treatment so that the first time period is shorter than the second time period; 6. The regenerated electronic circuit board according to claim 4 or 5.

7. a power supply control circuit having a first capacitor and a first photocoupler, and controlling the supply of power to a predetermined circuit including the first capacitor; and when the first photocoupler is energized in response to power supplied from an external source and operates normally, the power supply control circuit a method for producing refurbished electronic circuit boards from electronic circuit boards in which, when power is supplied to the predetermined circuit, the first capacitor is energized and the first photocoupler does not operate normally, the power supply control circuit does not supply power to the predetermined circuit, thereby preventing the first capacitor from being energized, and normal operation of the first photocoupler is guaranteed until the energization time reaches a first time, and a predetermined quality of the first capacitor is guaranteed until the energization time reaches a second time, the first time being shorter than the second time, providing power to the electronic circuit board; and if the first photocoupler does not operate normally, replacing the first capacitor and the first photocoupler with a second capacitor and a second photocoupler, respectively. A method for producing recycled electronic circuit boards.

8. The first capacitor is an electrolytic capacitor.

8. The method for producing recycled electronic circuit boards according to claim 7.

9. the first photocoupler is subjected to an aging treatment so that the first time is shorter than the second time; 9. The method for producing recycled electronic circuit boards according to claim 7 or 8.

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