JPH10276376A - Electronic device and its maintenance method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the electronic device in which repair man-hours are reduced on the occurrence of a fault in products shipped into market and to provide its maintenance method. SOLUTION: Factory adjustment data are stored in nonvolatile memories 53a, 53b at shipping of product, and factory data of the same contents as contents of the nonvolatile memories 53a, 53b are stored in a backup nonvolatile memory 53c. Even when a fault takes place in the product after shipment and the factory adjustment data cannot be read, the factory adjustment data stored in the backup nonvolatile memory 53c are all copied to the nonvolatile memories 53a, 53b by having only to enter a simple command so as to restore a state at factory shipment. Thus, even in the case of a fault that has the difficulty of site repair and required factory-repair, a serviceman easily copes with this fault at site and the maintenance man-hours are remarkably reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device to be shipped from a factory after adjusting predetermined data for ensuring the function of a product, and to a maintenance method for the electronic device after it is shipped from the market.

[0002]

2. Description of the Related Art In recent years, with the advancement of functions of electronic devices,
The number of data items that need to be adjusted at the time of shipment from the factory is steadily increasing. For example, taking a video display device such as a television receiver as an example, a so-called multi-scan monitor device that can support different scanning frequencies has appeared, but in this type of device, a single scanning frequency is required. Compared to a so-called single scan type monitor device that can only handle the adjustment, it is usual that the adjustment items that need to be adjusted at the time of factory shipment are various. Therefore, when a failure occurs in a product once shipped to the market and is repaired, it is difficult to readjust all of the adjustment data on site. For this reason, usually, a method has been adopted in which a product is once taken to a factory or a place equipped with an equivalent adjustment facility, readjusted, and returned to the customer.

[0003]

As described above, conventionally, in an electronic device having a function that requires adjustment, it is not easy to readjust a large number of adjustment data in the field at the time of a failure in the market, and it is difficult to collect and repair the data. In such a case, the number of man-hours required increases, and it is difficult to secure low maintenance cost and quick response.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an electronic device capable of reducing the number of repair steps when a failure occurs in a product shipped to the market and a maintenance method thereof. It is in.

[0005]

According to the present invention, there is provided an electronic apparatus comprising: a nonvolatile storage unit for storing product function related data obtained by adjustment at the time of product shipment, and a nonvolatile storage unit which is appropriately referred to during operation; A backup non-volatile storage unit that is provided separately from the unit and stores data having the same contents as the contents of the non-volatile storage unit. Here, the backup non-volatile storage means does not become an access target except in the case of checking its own operation and in the case of restoring the original state by copying the stored data to the non-volatile storage means. It is preferred to do so. As the nonvolatile storage means or the backup nonvolatile storage means, for example, an electrically erasable and writable semiconductor memory (EEPROM) can be used. Note that in the present invention, non-volatile means that data can be retained even when power is not supplied.

A maintenance method for an electronic device according to the present invention stores product function related data obtained by adjustment at the time of product shipment in a non-volatile storage means provided in the electronic device and appropriately referred to at the time of operation. In addition, data having the same contents as the contents of the nonvolatile storage means is stored in a backup nonvolatile storage means provided in the electronic device separately from the nonvolatile storage means, and stored in the nonvolatile storage means. When the contents are destroyed, the data stored in the backup non-volatile storage means is copied to the non-volatile storage means.

In the electronic device or the maintenance method according to the present invention, when the storage content of the nonvolatile storage device is destroyed, the data stored in the backup nonvolatile storage device is copied to the nonvolatile storage device. Product function related data can be restored.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 and 2 show the appearance of an image display apparatus as an electronic apparatus according to an embodiment of the present invention. FIG. 1 shows a state in which the apparatus is viewed from obliquely above the front of the apparatus. FIG. 2 shows a state in which the apparatus is viewed from obliquely above the rear surface of the apparatus. This video display device is used, for example, as a television receiver or a computer display device for home use or business use, but may be used as a display device for other uses.

As shown in FIG. 1, this video display device includes a display portion 10a provided on the front side of a video display device main body 10 and several panel operation keys 11 provided on a front panel. Have. The panel operation keys 11 include a power on / off switch, a volume adjustment key, a menu key and a selection key used for adjusting various functions such as contrast (CONTRAST) and brightness (BRIGHTNESS), and a type of input signal. And a switching key for switching between them. In addition, the front panel is provided with a light receiving unit (not shown) for receiving command data sent from a remote controller (not shown).

As shown in FIG. 2, an extension slot 12 is provided on the back side of the video display device, and a basic unit 13 and an extension unit (here, a scan converter 20 described later) are provided here. It can be attached and detached freely. Here, the basic unit 12 does not have a special extended function, and an external RGB signal (R;
RG for inputting red, G; green, B; blue color signals)
This unit has only a B input terminal and a serial data port such as RS232C.

FIG. 3 is a block diagram of the image display device 1 shown in FIG.
FIG. 3 shows a schematic block configuration in a state where the scan converter 20 is mounted in the expansion slot 12 of “0”.
As shown in this figure, the scan converter 20 is detachably connected to the video display device main body 10 by a connector 15 provided in the expansion slot 12.

First, the configuration of the image display device main body 10 will be described. The image display device main body 10 includes a CP (not shown).
U, ROM (Read Only Memory), RAM (Random Acc
ess memory) and a bus interface circuit, etc., a user interface (I / F) controller 32 having the same configuration, an on-screen display (OSD) controller 33, and a non-volatile memory. 34,
A deflection control circuit 35 and a bus switch 47 are provided. Among them, the user interface control unit 32, the OS
The D control unit 33 and the non-volatile memory 34 are connected to the common terminal C of the bus switch 47 by the serial bus 30a, and the main control unit 31 and the deflection control circuit 35 are connected to one switching terminal L of the bus switch 47 by the serial bus 30b.
It is connected to the. The other switching end H of the bus switch 47
Is connected to a serial bus 30c. The bus switch 47 switches the serial bus 30a to the serial bus 30c or the serial bus 3 when the signal level of the control line 48 connected to the connector 15 becomes H or L.
0b to be connected.

The video display device main unit 10 also has a video control circuit 37 connected to the main control unit 31 by an I ² C (Inter Integrated Circuit) bus 36 which is a serial bus.
And the output terminal of the video control circuit 37 and the OSD control unit 3
3 and an RGB decoder 38 connected to the output terminal of the
A CRT (cathode ray tube) 39 connected to the output end of the GB decoder 38;

When the scan converter 20 is not connected to the image display device main body 10, the control line 48 is at the L level, and unlike the state shown in FIG. Has been switched to. Therefore, the serial bus 30a is connected to the serial bus 30b. In such a state, each device of the video display device main body 10 functions as follows.

First, in this state, the main controller 31 controls the entire image display device (in this case, only the image display device main body 10).
Plays a role in controlling the operation of. That is, the main control unit 31 controls the entire operation in synchronization with the vertical blanking pulse (V-BLK-Pulse) 42 input from the deflection control circuit 35 at each start timing of each retrace period of the display screen. I do. More specifically, the RGB input to the video control circuit 37 from the RGB input terminal of the connector 15
The state of the B signal 43 is controlled, input from the various panel operation keys 11 shown in FIG. 1 via the user interface control unit 32, or a light receiving unit (not shown) from a remote controller (not shown). In accordance with the command data and the like sent to the device, lighting control of a power supply display LED (not shown) and control of each device connected to the serial buses 30a and 30b are performed. Also,
By inputting control data to the main controller 31 from the outside via a serial data line 44 such as RS232C via the connection connector 15, the entire video display device main body 10 can be controlled.

The user interface control unit 32 is configured as shown in FIG.
The input data from the panel operation keys 11 and the light receiving unit for the remote controller is sampled, and the sampling data is transmitted via the serial buses 30a and 30b in response to an inquiry from the main control unit 31. Control to turn on the power supply display LED in response to a request from the user.

The non-volatile memory 34 is, for example, an EEPROM.
M (electrically erasable and writable ROM), and the contrast (CONTRAST) as various elements that determine the state of the display image,
Brightness (BRIGHTNESS), horizontal size (H-SIZE), vertical size (V-SIZE), horizontal shift (H-SHIFT) and vertical shift (V
-SHIFT) is stored, and is referred to by the main control unit 31 when the power is turned on.

The OSD control unit 33 outputs video data representing a character to be displayed on the CRT 39 so as to be superimposed on a video as an RGB signal 41 to the RGB decoder 38 based on an instruction from the main control unit 31. For example, when the user adjusts various functions such as the above-described contrast, video data (RGB signals) necessary to display a menu screen as a user interface for the adjustment is transmitted by the OS.
It is created by the D control unit 33.

The deflection control circuit 35 controls the horizontal and vertical beam deflection of the CRT 39.
Some devices in this circuit are serial bus 30b
Through the main controller 31. This circuit has a horizontal synchronization frequency of 31.5 kHz, for example.
Thus, a so-called single scan system that performs deflection control at a scanning frequency of 70/60/50 Hz with a vertical synchronization frequency of z / z is configured.

The video control circuit 37 outputs a predetermined signal to the RGB input signal 43 input from the RGB input terminal of the connector 15 based on an instruction given from the main control unit 31 via the I ² C bus 36 which is a serial bus. And the RGB signal is input to the RGB decoder 38 as the RGB signal 45.

The RGB decoder 38 is connected to the video control circuit 3
7 and the RGB signal 45 from the OSD control unit 33.
The signal is mixed with the GB signal 41 and transmitted to the CRT 39.

Next, the configuration of the scan converter 20 will be described. The scan converter 20 includes a scan converter (S / C) control unit 51, a frequency conversion unit 52,
It includes nonvolatile memories 53a and 53b, a backup nonvolatile memory 53c, and an input switch 54. These units are interconnected by a serial bus 50. This serial bus 50 is connected to the serial bus 30c of the video display device main body 10 via the connector 15 when the scan converter 20 is connected to the video display device main body 10. The scan converter 20 also includes a three-dimensional Y / C separation unit 56 connected to the S / C control unit 51 via the I ² C bus 55.
And a hue decoder 57 connected to the output end of the three-dimensional Y / C separation unit 56.

A serial data line 66 and a control line 65 are connected to the S / C control unit 51. The serial data line 66 and the control line 65 are connected to the serial data line 44 and the control line 48 of the video display device main body 10 via the connector 15 when the scan converter 20 is connected to the video display device main body 10, respectively. It is to be connected. S / C control unit 51
Further, a vertical synchronization pulse 63 is input from the frequency conversion section 52.

The three-dimensional Y / C separation unit 56 and the hue decoder 57 are connected to the S / C control unit 5 connected by the I ² C bus 55.
1 controls the composite signal (normal VCR (Video Casse) input from the composite signal input terminal.
This is a circuit for converting a video signal reproduced from the tte recorder into an RGB signal 61. More specifically,
The composite signal 58 is output by the three-dimensional Y / C separation unit 56.
, A luminance signal Y and a color signal C are separated from each other, and an RGB signal 61 is created from the luminance signal Y and the color signal C by a hue decoder 57. The three-dimensional Y / C separation means not only comparing video signals for each scanning line in a frame, but also performing predetermined digital processing by comparing video signals of a certain frame and the next frame. , Y / C separation.

The input changeover switch 54 is connected to the S / C controller 5
1 selects one of an RGB input signal 62 input from an RGB input terminal and an RGB signal 61 input from a hue decoder 57 in accordance with a switching command sent via the serial bus 50. The data is input to the conversion unit 52.

The frequency conversion unit 52 includes an input switch 5
The RGB signal 60 input via the H.4 is converted to, for example, a horizontal synchronization frequency of 31.5 kHz and a vertical synchronization frequency of 60.
It is converted into an RGB signal 64 of Hz and output. Here, the convertible RGB input signal 60 is, for example, a signal having a horizontal synchronization frequency of 15 kHz to 85 kHz and a vertical synchronization frequency of 45 Hz to 130 Hz. Some devices in the frequency converter 52 are controlled by the S / C controller 51 via the serial bus 50. The RGB signal 64 output from the frequency conversion unit 52 is used to convert the scan converter 20 into the image display device main body 1.
0, the RGB signal 4 is transmitted to the video control circuit 37 of the video display device main body 10 via the connector 15.
3 is input.

The non-volatile memories 53a and 53b and the backup non-volatile memory 53c are, for example, EEPR, like the non-volatile memory 34 of the video display device main body 10.
OM. Among them, the nonvolatile memory 53
Various data adjusted at the time of shipment from the factory (hereinafter referred to as factory adjustment data) and various data adjustable by the user (hereinafter referred to as user data) are written in a and 53b. ing. Here, the factory adjustment data is, for example, VGA (Video Graphics Arra
y) Adjustment data relating to signals and the like, which is set only at the factory side and cannot be adjusted by the user. on the other hand,
The user data is adjustment data relating to contrast, brightness, and the like, and can be freely set by the user. The non-volatile memory for backup 53c is
a, 53b stores data having the same contents as the factory adjustment data. As will be described later, only when a failure occurs after the product is shipped to the market and a serviceman repairs the product on site. What is used.

This backup non-volatile memory 53c
Is a feature of the present invention.
Here, the factory adjustment data corresponds to the product function related data in the present invention, the non-volatile memories 53a and 53b correspond to the non-volatile storage means in the present invention, and the non-volatile backup memory 53c is the non-volatile backup memory in the present invention. Corresponds to storage means.

FIGS. 4 and 5 show the memory maps of the nonvolatile memories 53a and 53b, respectively, and FIG. 6 shows the memory map of the backup nonvolatile memory 53c. In these figures, the horizontal axis represents the upper 4 bits of the memory address, and the vertical axis represents the lower 4 bits. In this example, F1-A.
Six types of factory adjustment data of F1-F are stored (FIG. 4), and ten types of factory adjustment data of F2-A to F2-J are stored in the nonvolatile memory 53b (FIG. 5). Other areas are user data areas. On the other hand, as shown in FIG. 6, the backup non-volatile memory 53c has factory adjustment data F1-A to F1-F stored in the non-volatile memory 53a and factory adjustment data F2 stored in the non-volatile memory 53b. -A ~
The same data as F2-J is stored.
The weight has been increased. Of these non-volatile memories,
While the non-volatile memories 53a and 53b are appropriately accessed by the S / C control unit 51 in a normal use state,
The backup non-volatile memory 53c is hardly accessed in a normal use state, and is accessed only when performing a memory check at power-on and when performing a maintenance service in a market described later.

Next, the operation of the video display device having the above configuration will be described.

First, the operation during normal use will be described. The scan converter 20 is inserted from the expansion slot 12 on the back of the video display device main body 10 and connected to the video display device main body 10 by the connection connector 15, and the video display device main body 1
When the power switch on the front panel is turned on, power is supplied to each part of the video display device main body 10 and also to each part of the scan converter 20 via the connector 15.

When power is supplied to scan converter 20, S / C control section 51 changes control line 65 to H level. Thereby, the control line 4 of the video display device main body 10 is
8 also goes to the H level, and the bus switch 47 switches to the side connecting the serial bus 30a and the serial bus 30c. As a result, the serial bus 50 of the scan converter 20 and the serial bus 30c of the video display device main body 10,
The S / C control unit 51 obtains a control right for the user interface control unit 32, the OSD control unit 33, and the nonvolatile memory 34 of the video display device main body 10. On the other hand, the main controller 31 of the video display device body 10
Loses control over those devices. At this time, the S / C control unit 51 of the scan converter 20 connects the video display device main body 10 via the serial data line 66, the connector 15, and the serial data line 44.
To the main control unit 31 of which the bus has been switched. After that, the S / C control unit 51
It operates in synchronization with the vertical synchronizing pulse 63 input from. After that, the main control unit 31 of the video display device main body 10 receiving the report of the bus switching stops accessing the user interface control unit 32, the OSD control unit 33, and the nonvolatile memory 34 thereafter. As a result, the user interface control unit 32, the OSD control unit 33, and the nonvolatile memory 34 are completely separated from the main control unit 31 both physically and software logic.

S / C control unit 5 of scan converter 20
1 controls the state of the composite signal 58 input to the three-dimensional Y / C separation unit 56 and the state of the RGB input signal 62 input from the RGB signal input terminal, is input from the panel operation key 11, or is a remote controller. The control of each device connected to the serial buses 50, 30c, 30a is performed in accordance with the command data input from the device via the light receiving unit. However, at this time, when the factory adjustment data is referred to, the non-volatile memories 53a and 53b are referred to instead of the non-volatile backup memory 53c, and the access to the non-volatile backup memory 53c is not performed. The S / C control unit 51 also controls the main control unit 31 of the video display device main body 10 via the serial data lines 66 and 44. As a result, the S / C control unit 51 also indirectly controls the deflection control circuit 35 and the video control circuit 37 via the main control unit 31.
The C control unit 51 functions as a main control unit of the entire system.

As described above, the scan converter 20
Is not connected to the video display device main body 10, the input signal is only the RGB signal, the horizontal synchronization frequency is 31.5 kHz, and the vertical synchronization frequency is 70/60/50.
Hz is a single scan type video display device, but by connecting the scan converter 20, the input signal is an RGB signal and a composite signal, the horizontal synchronization frequency is 15 kHz to 85 kHz, and the vertical synchronization frequency is The function is extended to a multi-scan type video display device at 45 Hz to 130 Hz.

The main controller 31 controls the contrast, brightness,
A user interface program (that is, user interface control) for allowing a user to freely adjust basic functions such as horizontal size, vertical size, horizontal shift, and vertical shift by a command from the panel operation keys 11 or a remote controller. Program for controlling the section 32), but no user interface programs for the expanded functions. On the other hand, the S / C control unit 51 of the scan converter 20
Indicates the basic functions described above, as well as hue (PHASE) and saturation (CHROM
A), horizontal width (H-WIDTH), vertical height (V-HEIGHT), horizontal center
(H-CENT), vertical center (V-CENT), still image (STILL), zoom
It also has a user interface program for extended functions such as (ZOOM). Then, after the scan converter 20 is connected to the video display device main body 10 and the functions are expanded, the S / C control unit 51 of the scan converter 20 manages all user interfaces.
However, brightness, horizontal size, vertical size, horizontal shift,
And controls various functions such as vertical shift directly
It is the main control unit 31 of the video display device main body 10.
Therefore, the S / C control unit 5 of the scan converter 20
When a command according to a user interface managed by the user is received from the user interface control unit 32, a command corresponding to the command is transmitted to the main control unit of the video display device main body 10 via the serial data lines 66 and 44. The main control unit 31 transfers the deflection control circuit 35
And the control of the video control circuit 37, the control is executed indirectly.

Next, a procedure for setting and resetting adjustment data of the video display device, which is a feature of the present invention, will be described with reference to FIGS.

FIG. 7 shows a process for setting factory adjustment data in the scan converter 20 before the scan converter 20 is shipped from the factory to the market. In this step, first, as shown in FIG. 8, the dedicated adjusting device 70 is connected to the serial data line 66 of the connector 16 provided in the scan converter 20 via the serial data line 71 (Step S101 in FIG. 7). The adjustment device 70 is a jig-like tool including a CPU, a ROM, a RAM (not shown), and has a function of adjusting various factory adjustment data necessary for the scan converter 20 to operate properly. ing. Next, using the adjustment function of the adjustment device 70, the scan converter 2
Various factory adjustment data to be set to 0 are adjusted. The adjustment at this time is performed using a RAM (not shown) of the adjustment device 70 as a work memory (step S102).

When all adjustments are completed (step S10)
3; Y), the factory adjustment data stored in the RAM in the adjustment device 70 is transferred to the S / C control unit 51 of the scan converter 20 via the serial data lines 71 and 66.
The S / C control unit 51 of the scan converter 20 stores all the received factory adjustment data in the two nonvolatile memories 5.
3a and 53b, and store these factory adjustment data in the backup nonvolatile memory 5.
3c is also stored (step S104). This allows
The memory maps of the non-volatile memories 53a and 53b and the backup non-volatile memory 53c are shown in FIGS.
As shown in FIG. Thus, the adjustment / setting process of the factory adjustment data at the time of shipment from the factory is completed.

Next, with reference to FIG. 9, a description will be given of the processing after a failure or the like has occurred in the apparatus which has been shipped from the factory to the market and repaired by a serviceman. Here, it is assumed that the nonvolatile memories 53a and 53b of the scan converter 20 have failed for some reason, and the factory adjustment data held by the nonvolatile memories cannot be read out.

In this case, the serviceman replaces and repairs the failed component (here, the non-volatile memories 53a and 53b), and then connects the scan converter 20 to the video display device main body 10 with the scan converter 20 connected thereto. The user operates the panel operation key 11 to input a special service command. The input of the service command may be performed using a remote controller (not shown).

S / C controller 5 of scan converter 20
When detecting that a service command has been input via the user interface control unit 32 of the video display device main body 10 (step S201; Y in FIG. 9), the control unit 1 shifts to a service mode (step S202) and displays the display unit. The service menu dedicated to the serviceman is displayed on 10a (step S203). When a command other than the backup command is selected on the service menu screen (step S204; N), the S / C control unit 51 of the scan converter 20 performs a process corresponding to the command (step S205). On the other hand, if the return (restore) command is selected (step S204; Y),
The / C control unit 51 includes a backup nonvolatile memory 53
The factory adjustment data stored in the non-volatile memory 5
3a and 53b (step S20)
6). At this time, the correspondence between the memory addresses of the copy source and the copy destination of each factory adjustment data is set in a user interface program held by the S / C control unit 51, and copying is performed based on this.

The S / C control unit 51 includes a nonvolatile memory 53
The deflection control circuit 35 and the video control circuit 37 are controlled via the main control section 31 of the video display device main body 10 based on the factory adjustment data copied to the a and 53b. indicate. As a result, when the state of the image is proper and fine adjustment is not required (Step S207; N), the repair process is terminated as it is. On the other hand, when the state of the image is not appropriate (step S207; Y), fine adjustment is further performed on the factory adjustment data (step S208), and the repair process ends. At this time, the data after the fine adjustment is stored in the nonvolatile memory 5.
3a, 53b and backup non-volatile memory 53
c is overwritten and saved. In the present embodiment, fine adjustment is performed after restoring the contents of the non-volatile memories 53a and 53b, but fine adjustment may not be performed at all. However, even when the fine adjustment is performed, the man-hour required for the adjustment is significantly reduced as compared with the case where the adjustment is performed from scratch.

As described above, in the video display device according to the present embodiment, even if a failure occurs in the product after shipment and the factory adjustment data cannot be read out, the backup nonvolatile memory can be obtained simply by inputting a simple command. The factory adjustment data stored in the non-volatile memory 53c is
3b, and can be restored to the factory default state. For this reason, a serviceman can easily respond on site to a failure that has conventionally been difficult to repair on site and must be taken over and repaired. In addition, when it is necessary to refer to the factory adjustment data in the normal use state, the non-volatile memories 53a and 53b are accessed and the access to the non-volatile memory 53c for backup is hardly performed. The factory adjustment data in the non-volatile memory 53c can be prevented from being destroyed by frequent access.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to this embodiment, and can be variously modified. For example, in the above embodiment, two nonvolatile memories and one backup nonvolatile memory are provided. However, different numbers of nonvolatile memories and backup nonvolatile memories may be provided as necessary. It may be.

In this embodiment, the case where the scan converter 20 has failed has been described as an example.
The same applies to the case where the video display device main body 10 breaks down. In this case, a backup non-volatile memory is provided inside the video display device main body 10 separately from the non-volatile memory 34, and the same data as the factory adjustment data stored in the non-volatile memory 34 is stored therein. It should be kept.

In this embodiment, an EEPROM, a semiconductor memory, is used as a backup non-volatile storage means.
M has been described as an example, but in addition, for example, EPRO
M (programmable ROM capable of erasing data by ultraviolet rays or the like), PROM (programmable ROM), or a normal mask ROM may be used. further,
Instead of a semiconductor memory, a recording medium such as a hard disk or an optical disk may be used.

Further, in the present embodiment, the scan converter 20 is configured to be detachable from the video display device main body 10, but the circuit portion related to the scan converter 20 is integrally built in the video display device main body 10. The present invention is also applicable to a case in which the configuration is made.

Furthermore, although the present invention has been described with reference to a video display device, the present invention is not limited to this.
The present invention can be widely applied to all types of electronic devices shipped with factory adjustment data set.

[0050]

As described above, according to the electronic apparatus of any one of claims 1 to 3, the product function related data obtained by the adjustment at the time of shipping the product is stored and the data is stored during operation. In the non-volatile storage means and the non-volatile storage means, which are appropriately referred to in the above, the backup non-volatile storage means for storing data having the same content as the content of the non-volatile storage means is provided separately. When the storage contents of the nonvolatile storage means are destroyed, the original factory adjustment data can be easily restored using the data stored in the backup nonvolatile storage means. Therefore, even in the past, servicemen can easily respond to failures that were difficult to repair and adjust on site and had to perform repairs on site,
There is an effect that the number of maintenance steps can be significantly reduced.

In particular, according to the electronic device of the second aspect,
When it is necessary to refer to the factory adjustment data in the normal use state, the non-volatile storage means is accessed, and access to the non-volatile storage means for backup is hardly performed. Factory adjustment data can be protected from destruction by frequent access. Therefore, there is an effect that reliability in performing maintenance can be improved.

According to a fourth aspect of the present invention, there is provided a non-volatile storage means provided in an electronic device and appropriately referred to during operation of the electronic device, the product function obtained by adjustment at the time of product shipment. In addition to storing related data, the same data as the contents of the non-volatile storage means is stored in a non-volatile storage means for backup provided in the electronic device separately from the non-volatile storage means. When the storage content of the storage means is destroyed, the data stored in the backup non-volatile storage means is copied to the non-volatile storage means, so that the original storage content (factory adjustment data) of the non-volatile storage means is restored. It can be easily restored. Therefore, a serviceman can easily cope with a failure that has conventionally been difficult to repair and adjust at the site, and the maintenance man-hour can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a video display device as an example of an electronic apparatus according to an embodiment of the present invention.

FIG. 2 is another external perspective view of the video display device of FIG.

FIG. 3 is a block diagram illustrating a schematic configuration of the video display device.

FIG. 4 is a diagram showing contents of a nonvolatile memory incorporated in a scan converter mounted on the video display device.

FIG. 5 is a diagram showing the contents of another nonvolatile memory incorporated in the scan converter.

FIG. 6 is a diagram showing the contents of a backup non-volatile memory incorporated in the scan converter.

FIG. 7 is a flowchart illustrating a process of setting factory adjustment data in a scan converter which is a product before shipment from a factory.

FIG. 8 is a block diagram illustrating a device connection state when factory adjustment data is set in a scan converter that is a product before shipment from a factory.

FIG. 9 is a flowchart illustrating a part of a repair process performed by a serviceman when a failure or the like occurs in a scan converter in a market.

[Explanation of symbols]

10 image display device main body, 11 panel operation keys, 12
... Expansion slot, 15 ... Connector, 20 ... Scan converter, 30a, 30b, 30c, 50 ... Serial bus, 31 ... Main control unit, 32 ... User interface control unit, 33 ... OSD control unit, 34 ... Non-volatile memory , 3
5: deflection control circuit, 37: video control circuit, 38: RG
B decoder, 39 CRT, 44, 66 serial data line, 47 bus switch, 51 S / C controller,
52: frequency conversion unit, 53a, 53b: nonvolatile memory, 53c: nonvolatile memory for backup, 54: input changeover switch, 56: three-dimensional Y / C separation unit, 57: hue decoder, 70: adjustment device

Claims (4)

[Claims] 1. Non-volatile storage means for storing predetermined product function-related data obtained by adjustments to be performed before product shipment, and which is appropriately referred to during operation, and is provided separately from the non-volatile storage means. And a backup non-volatile storage means for storing data having the same contents as the contents of the non-volatile storage means. 2. The method according to claim 1, wherein the backup non-volatile storage unit is an access target except for an operation check of itself and a case where data to be stored is copied to the non-volatile storage unit to restore an original state. The electronic device according to claim 1, wherein the electronic device is not stored. 3. The electronic apparatus according to claim 1, wherein the nonvolatile storage means or the backup nonvolatile storage means comprises an electrically erasable / writable semiconductor memory. 4. A non-volatile storage means provided in an electronic device and appropriately referred to at the time of operation thereof stores product function-related data obtained by adjustment at the time of shipment of the product. Separately, data having the same content as the content of the nonvolatile storage means is stored in the backup nonvolatile storage means provided in the electronic device, and when the storage content of the nonvolatile storage means is destroyed. A method of maintaining the electronic device, wherein data stored in the backup nonvolatile storage means is copied to the nonvolatile storage means.