JP2002286777A - Electronic equipment having simplified inspection function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect abnormality of a power source system without unsealing a casing. SOLUTION: This electronic equipment has a main rectifying/smoothing circuit 44 to which an alternating voltage is supplied, a main power source circuit 48 to which a supply voltage outputted from the main rectifying/smoothing circuit is supplied, for acquiring driving voltages having different values to be provided to plural circuit systems installed in the electronic equipment, a voltage measuring means 38 to which each of the supply voltage and the plural driving voltages is supplied as inspection voltages, and a memory means 68 for memorizing respectively a reference value to the supply voltage and plural reference values to the plural driving voltages. A transmission/reception means for executing transmission/reception with the outside is installed in the voltage measuring means. Since a defective spot inspection means is included inside the device, a measuring voltage can be detected by transmitting the measuring voltage to the reception means without unsealing the easing. The quality of the power source system can be roughly diagnosed beforehand without disjointing a set, to thereby attain speed-up of an inspection work of the quality, speed-up of part procurement, and shortening of the inspection work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device having a simple inspection function for easily inspecting an internal defect of an electronic device or the like. In particular, by utilizing the voltage measurement means provided inside, particularly the defective parts of the power supply circuit system can be measured without disturbing the cabinet (electronic device housing), and the defective parts can be estimated in advance. Things.

[0002]

2. Description of the Related Art When diagnosing a defective portion of an electronic device brought in by a user or the like, usually, after removing a housing (cabinet) of the electronic device to expose a circuit board and the like, a power supply is turned on. First of all, we often start checking around the power supply.

As an example of a television receiver as an electronic apparatus, as shown in FIG. 4, a cabinet of the television receiver 10 includes a front panel 12 and a rear panel 14, and a cathode ray tube (CRT) 16 is provided therein. It is fixed to the front panel 12 side. A plurality of circuit boards 18 and the like are mounted inside the cabinet. The cathode ray tube 16 is provided with a deflecting device 20, a beam adjusting means 22, and the like.

In order to measure a defective portion of the television receiver 10, the rear panel 14 is removed as shown in FIG.
While applying a and 24b, the voltage at that location is measured, and it is checked whether the measured voltage is a specified value. If the measured value is not the specified value, it is determined to be defective, and the measurement location is readjusted or the electronic component at the measurement location is replaced.

[0005]

As described above, conventionally,
To determine the quality of the power system using a tester, etc.
At present, servicemen first disassemble the housing before starting diagnosis.

[0006] Therefore, in determining the quality of an electronic device, first, there is a work of unscrewing the set, and then all of the main measuring points are measured by a tester or the like, and the defective points are confirmed from the measurement results, and the defective points are confirmed. Must be re-adjusted and parts procured for defective parts replacement. Therefore, conventionally, the inspection work takes a long time and a considerable amount of labor is spent for the inspection.

Therefore, the present invention solves such a conventional problem, and has a simple inspection function capable of easily estimating a defective part or a defective part without dispersing a set or the like. An electronic device is proposed.

[0008]

In order to solve the above-mentioned problems, an electronic apparatus having a simple inspection function according to the present invention is provided with a main rectifying / smoothing circuit to which an AC voltage is supplied, A power supply voltage output from the main rectification / smoothing circuit is supplied, and a main power supply circuit for obtaining drive voltages having different values supplied to a plurality of circuit systems provided in the electronic device; A voltage measuring means for supplying each of the plurality of drive voltages as a test voltage; and a memory means for respectively storing a reference value for the power supply voltage and a plurality of reference values for the plurality of drive voltages. The measuring means is provided with a transmitting / receiving means for transmitting / receiving to / from the outside.

According to the present invention, a voltage measuring means for inspecting a defective portion is built in the apparatus. A microcomputer is used as the voltage measuring means, and a plurality of power supply voltages (main power supply voltage and a plurality of drive voltages) obtained from a power supply system are supplied as measurement voltages. This measured voltage is transmitted to the external receiving means via the transmitting / receiving means. The display section provided in the receiving means displays the measured voltage itself and the result of the pass / fail judgment.

When the measured voltage is different from the specified voltage, at least the power supply system is defective, and it is necessary to readjust it or replace the electronic parts. In this way, the quality of the power supply system can be roughly diagnosed in advance without disassembling the set, so that it is possible to achieve quickness of the quality inspection work, quicker procurement of parts, reduction of the inspection work, and the like.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electronic apparatus having a simple inspection function according to an embodiment of the present invention, which is applied to the above-described television receiver as an embodiment, will be described in detail with reference to the drawings. FIG. 1 is a connection diagram showing a main part of a power supply system among television receivers. Terminal 3 to which AC voltage is supplied
A rectifier circuit 34 is connected to each of the rectifier circuits 2 and 32. The output voltage of the rectifier circuit 34 is supplied to a voltage regulator 36 to be a predetermined voltage.
8 is supplied as the drive voltage. Therefore, in this case, a driving voltage of 5 volts is applied.

The control unit 38 is constituted by a microcomputer. The control unit 38 can also serve as a main control microcomputer that controls various controls of the television receiver body. The microcomputer 38 has a built-in transmitting / receiving means (not shown) therein and has a transmitting / receiving end 40. The data transmitted from the transmitting / receiving means is received by the receiving means 42. In this example, a remote control is used as the receiving means 42. Therefore, the remote control 42 is bidirectional having a transmission / reception function.

Now, the terminals 32, 32 of the AC voltage described above
Is connected to a main rectifier / smoothing circuit 44 as a main power supply, and a main power supply voltage, in this example, 120 volts is obtained across the smoothing capacitor 46. This main power supply voltage is further supplied to a voltage regulator 48, and in this embodiment, a plurality of drive voltages having different values are generated.

In the embodiment, three driving voltages are output. First, a drive voltage (11 in this example) of a flyback transformer (not shown) to which the primary coil is connected.
5 volts) is output to the first terminal 48a. Second, a drive voltage (25 volts in this example) for a horizontal and vertical deflection circuit (not shown) is output to terminal 48b. Third, a drive voltage (for example, 15 volts) supplied to a video amplification circuit system (not shown)
Is output to the terminal 48c.

In order to check whether or not the main power supply voltage and the plurality of drive voltages are output as normal values, in this embodiment, the plurality of drive voltages are converted into input voltages suitable for the control unit 38, Voltage is supplied.

For this reason, first, the first voltage is applied to the main power supply voltage.
Is provided to reduce the voltage to a predetermined voltage Eo. This voltage Eo is A / D as the first measurement voltage.
The signal is supplied to the converter 52 and converted into a digital signal.
The digitized measurement voltage Eo is supplied to a corresponding input terminal of the control unit 38. Since the control unit 38 operates at 5 volts or less, the first measured voltage Eo is converted to a predetermined divided voltage that is 5 volts or less.

Similar processing is performed for a plurality of drive voltages. First, the drive voltage (115 volts) applied to the flyback transformer is divided by the second resistance voltage dividing circuit 54 to a second measured voltage E1. The second measurement voltage E1 is converted into a digital signal by the A / D converter 56 and then supplied to the control unit 38. The drive voltage (25 volts) supplied to the deflection circuit system is divided by the third resistance voltage dividing circuit 58 to a third measured voltage E2. The third measurement voltage E2 is converted into a digital signal by the A / D converter 60 and then supplied to the control unit 38. Then, the driving voltage (15 volts) supplied to the video amplification system is divided by the fourth resistance voltage dividing circuit 62 to a fourth measured voltage E3. The fourth measurement voltage E3 is converted into a digital signal by the A / D converter 64 and supplied to the control unit 38.

The control section 38 is provided with a memory means 68 in which reference values (design values) relating to a plurality of drive voltages to be subjected to a simple inspection including the above-mentioned power supply voltage are stored. Then, when a simple inspection command is issued from the remote controller 42 described later, these reference values are transmitted together with the measured voltage.

The control unit 38 performs a process of returning the measured voltage corresponding to the main power supply voltage and the plurality of measured voltages related to the plurality of drive voltages to the value of the main power supply voltage and the plurality of drive voltages again. This reconversion processing is performed by the remote controller 42
These voltage values, which are performed when a voltage check command is received from the side and are reconverted, are transmitted to the remote controller 42 via the transmitting / receiving means.

The bidirectional remote controller 42 can be configured as shown in FIG. The remote control main body 43 is provided with a plurality of operation keys 70 including ten keys and function keys. A service key 72 used for performing a simple inspection among the function keys is provided. By operating the service key 72, a measured voltage of a power supply system in the television receiver 10 can be automatically received. The remote control main body 43 is further provided with a display section 74 using a liquid crystal element or the like, on which the received measured voltage value, reference voltage value and the like are displayed.

Next, the flow of the simple inspection work in the television receiver 10 having the simple inspection function according to the present invention will be described. (1) Insert the power plug of the TV set into an outlet. As a result, the inspection microcomputer 38 has the operating voltage + B
Is supplied. (2) Operate the power key of the external operation device (remote controller in this example) 42 which can also be used for inspection. When the power key is operated, the control unit 38 determines that the power key is turned on, and the power switch 80 provided in the preceding stage of the main rectifying / smoothing circuit 44 is turned on. Although not shown, the power switch 80 can be controlled by a biasing means such as a relay. (3) When the power switch 80 is turned on, the main rectifying / smoothing circuit 44 operates. As a result, the next-stage voltage regulator (such as a switching regulator) 48 operates to obtain a plurality of types of operating voltages to be supplied to the set. (4) The plurality of types of operating voltages are supplied to the resistance voltage dividing circuits 50 and 5
The signals are taken into the control unit 38 via 4, 58, 62. (5) Remote control 4
The second service key 72 is operated. When the control unit 38 determines that the service key 72 has been operated, the control unit 38
Is controlled to the data transmission mode, and the plurality of measurement voltages input to the control unit 38 are transmitted together with the reference set voltage stored in the memory means 68. (6) The measured voltage and the reference set voltage are displayed on the display unit 74 of the remote controller 42 as the measured voltage and the set voltage. (7) From the contents of the display section 74, it is possible to determine which power supply system is defective (failed part) without removing the rear panel 14. As a result, it is possible to quickly determine a defective portion, and to speed up the inspection work.

Since the control section 38 has a memory means 68 for storing a reference value, when the control section 38 has a discrimination processing function, the control section 38 automatically performs a collation process between the reference value and the measured voltage. Can be done. By receiving the result of the pass / fail verification, the defective part can be known. For example, as shown in FIG. 3, if the measured voltage is displayed by “good / bad”, it is possible to understand at a glance which power supply system is defective.

In the above-described embodiment, a television receiver is illustrated as an example of an electronic device. However, it is easily understood that the present invention can be applied to an electronic device that requires a plurality of drive voltages, such as an audio device.

[0024]

As described above, according to the present invention, the voltage measuring means for inspecting a defective portion is built in the apparatus so that the information can be externally referred to when necessary.

According to this, before opening the housing, the power supply voltages of a plurality of systems (main power supply voltage and plural drive voltages, etc.) obtained from the power supply system can be known from outside as measurement voltages. Therefore, when the measured voltage is different from the specified voltage, it is understood that at least the power supply system is defective, and it is necessary to readjust or replace the electronic components. As a result, the quality of the power supply system can be roughly diagnosed in advance without disassembling the set, so that it has a feature that it is possible to achieve quickness of quality inspection work, quick procurement of parts, reduction of inspection work, and the like.

Therefore, the present invention is extremely suitable for application to electronic equipment requiring a plurality of drive voltages.

[Brief description of the drawings]

FIG. 1 is a connection diagram of a main part showing an embodiment when an electronic device having a simple inspection function according to the present invention is applied to a television receiver.

FIG. 2 is a diagram of a bidirectional remote controller as a receiving unit.

FIG. 3 is a diagram showing a display example.

FIG. 4 is a perspective view showing an example of inspection of the television receiver.

[Explanation of symbols]

 Reference Signs List 10 TV receiver 12, 14 Panel 38 Control unit (microcomputer) as voltage measuring means 42 Receiving means (bidirectional remote controller) 44 Main rectifying / smoothing circuit 48 Voltage regulator 50, 54, 58, 62 Resistive voltage dividing circuit 52, 56, 60, 64 A / D converter

Claims (2)

[Claims] 1. A main rectifying / smoothing circuit to which an AC voltage is supplied, a power supply voltage output from the main rectifying / smoothing circuit, and a plurality of circuit systems provided in an electronic device. A main power supply circuit for obtaining drive voltages having different values, a voltage measuring means for supplying each of the power supply voltage and the plurality of drive voltages as a test voltage, a reference value for the power supply voltage, and the plurality of drive voltages An electronic device having a simple inspection function, comprising: memory means for storing a plurality of reference values for each of the above, and transmission / reception means for performing transmission / reception with the outside is provided in the voltage measurement means. 2. The simple inspection according to claim 1, wherein the determination result determined by the voltage measurement means or the inspection voltage itself is transmitted to the outside via the transmission / reception means. Electronic equipment with functions.