JP2000203134A - Image forming apparatus and remotely diagnosing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a fault of an equipment caused by an abnormal state of a power source. SOLUTION: In the remotely diagnosing system comprising the image forming apparatus 200 having power source means 210, 220 connected to an external AC power source to supply powers of predetermined voltages, a sensing means 230 for sensing a voltage input to the power source means, a communicating means 270 capable of communicating with an exterior, and a control means 240 for controlling to monitor a fault of the voltage sensed by the sensing means, and a remotely diagnosing unit 400 connected to the apparatus 200 through a communication channel 300; the means 240 transmits its fault to the unit 400 by the means 270 when the voltage is decided to be a fault.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus and a remote diagnosis system, and more particularly, to an image forming apparatus and a remote diagnosis system capable of preventing a failure of a device due to a power failure.

[0002]

2. Description of the Related Art In an electronic apparatus such as an image forming apparatus, power supplied (input) from an AC commercial power supply such as an external AC power supply of AC 100 V or AC 200 V is driven by a DC power supply as a power supply means. DC12 for
DC power such as V or 5 V DC is generated.

[0003]

When a transformer is used to transform the primary side and the secondary side of the power supply means, the primary side voltage and the secondary side voltage are in a proportional relationship. ing. In such a case, if a voltage exceeding a predetermined value enters the primary side for some reason, the voltage on the secondary side also increases in proportion.

[0004] For this reason, an electronic circuit or the like supplied from the power supply means may be damaged. Further, when an unexpected voltage higher than the withstand voltage is applied to a member constituting the power supply means, for example, an electrolytic capacitor for smoothing, the structural member such as the electrolytic capacitor may be damaged.

[0005] Therefore, in order to prevent such a failure of the power supply means and the electronic circuit on the secondary side, a circuit for monitoring the input voltage on the primary side supplied from an external AC power supply may be provided.

However, the power input from an external AC power supply is an AC voltage of 100 to 200 V, and it is difficult to construct a circuit at low cost because the voltage is high. Further, even if a voltage abnormality at a certain point in time can be monitored, no consideration is given to recording the abnormality. For this reason, it was not possible to later confirm how and when the abnormality occurred.

Accordingly, an object of the present invention is to realize an image forming apparatus and a remote diagnosis system which can prevent a failure of a device due to a power supply abnormality.

[0008]

That is, the present invention for solving the above problems is as described below. (1) The invention according to claim 1 is a power supply unit connected to an external AC power supply for supplying power of a predetermined voltage, a detection unit for detecting a voltage input to the power supply unit, and capable of communicating with the outside. Control means for monitoring abnormalities in the voltage detected by the detecting means, and when it is determined that the voltage is abnormal, transmitting the abnormalities to the outside by the communication means; An image forming apparatus comprising:

According to the present invention, the control means monitors the abnormality of the voltage detected by the detection means, and when it is determined that the voltage input from the AC power supply is abnormal, the control means reports the abnormality to the communication means. Is controlled to transmit to the outside.
For this reason, the occurrence of a power supply abnormality can be known from the outside, and device failure due to the power supply abnormality can be prevented.

(2) In the invention described in claim 2, the control means determines that the number of times the voltage is detected to be abnormal is:
2. The image forming apparatus according to claim 1, wherein when the number of times reaches a predetermined number, control for transmitting the abnormality to the outside by the communication unit is performed.

According to the present invention, when the abnormality is detected a predetermined number of times, the transmission is performed by the communication means. Therefore, it is possible to effectively monitor the abnormality of the power supply that needs to be checked, and to detect the abnormality of the power supply. Can be prevented beforehand.

(3) The invention according to claim 3 further comprises a transformer for transforming the voltage of the external AC power supply, the external AC power supply being transformed by the transformer, and the detecting means being transformed by the transformer. The image forming apparatus according to claim 1, wherein a voltage is detected.

According to the present invention, since the voltage transformed to a low voltage by the transformer is detected, the abnormality of the power supply can be easily monitored, and the failure of the equipment due to the abnormality of the power supply can be prevented.

(4) In the invention according to claim 4, the power supply means includes a smoothing capacitor, and the control means determines that a voltage higher than a withstand voltage of the smoothing capacitor used in the power supply means is detected by the detection means. 4. The image forming apparatus according to claim 1, wherein when the abnormality is detected, control for transmitting the abnormality to the outside by the communication unit is performed.

According to the present invention, when a voltage higher than the withstand voltage of the smoothing capacitor used in the power supply means is detected, the abnormality is transmitted to the outside. Monitoring can be performed, and device failure due to power supply abnormality can be prevented.

(5) The invention according to claim 5 is a power supply means connected to an external AC power supply for supplying power of a predetermined voltage, a detection means for detecting a voltage inputted to the power supply means, and an operation means. Operation display means for accepting and displaying the status, storage means for storing predetermined information, and monitoring for abnormality of the voltage detected by the detection means, and when it is determined that the voltage is abnormal, A control for storing abnormality information indicating an abnormal state in the storage means, and when a request for displaying a voltage abnormality is made from the operation display means, the abnormality information stored in the storage means is displayed on the operation display means. And control means for performing control to display the image on the image forming apparatus.

According to the present invention, the control means stores the abnormality information and performs control for displaying the abnormality information in accordance with the display request. For this reason, it is possible to know the occurrence of a power supply abnormality as necessary, and it is possible to prevent equipment failure due to the power supply abnormality.

(6) The image forming apparatus according to claim 5, wherein the abnormality information includes information on the number of times the power supply voltage has become abnormal. In the present invention, the control means stores abnormality information relating to the number of times of abnormality, and performs control for displaying the abnormality information according to the display request. For this reason, it is possible to know the detailed situation of the occurrence of the power supply abnormality as necessary, and it is possible to prevent a device failure due to the power supply abnormality.

(7) The image forming apparatus according to the fifth aspect, wherein the abnormality information includes information on a date and time when the abnormality has occurred. According to the present invention, the control means stores abnormality information relating to the date and time when the abnormality has occurred, and performs control to display the abnormality information in accordance with the display request. For this reason, it is possible to know the detailed situation of the occurrence of the power supply abnormality as necessary, and it is possible to prevent a device failure due to the power supply abnormality.

(8) The image forming apparatus according to any one of (1) to (7), wherein the power supply means outputs DC power. It is.

According to the present invention, it is possible to detect an abnormality in the power supply of the image forming apparatus that outputs DC power. (9) According to the ninth aspect of the present invention, a power supply unit connected to an external AC power supply for supplying power of a predetermined voltage, a detection unit for detecting a voltage input to the power supply unit, and communicable with the outside. Communication means, and a control means for controlling the voltage abnormality detected by the detection means, and a remote diagnostic apparatus connected to the image forming apparatus via a communication line. A remote diagnostic system, wherein, when it is determined that the voltage is abnormal, the control means transmits the abnormality to the remote diagnostic device by the communication means. It is.

According to the present invention, the control means monitors the abnormality of the voltage detected by the detection means, and if it is determined that the voltage input from the AC power supply is abnormal, the control means monitors the abnormality by the communication means. Controls the transmission to the remote diagnostic device. For this reason, the occurrence of a power supply abnormality can be known from the outside, and device failure due to the power supply abnormality can be prevented.

(10) In the invention according to a tenth aspect, when the number of times the voltage is detected to be abnormal has reached a predetermined number, the control means determines the abnormality by the communication means. 10. The remote diagnostic system according to claim 9, wherein the remote diagnostic system controls transmission to a remote diagnostic device.

According to the present invention, the transmission by the communication means is performed when the number of times of abnormality detection reaches a predetermined number. Therefore, it is possible to effectively monitor a power supply abnormality that needs to be checked, and Can be prevented beforehand.

(11) The invention according to claim 11 further includes a transformer for transforming the voltage of the external AC power supply, the external AC power supply being transformed by the transformer, and the detecting means being transformed by the transformer. The remote diagnosis system according to claim 9, wherein a voltage is detected.

According to the present invention, since the voltage converted to a low voltage by the transformer is detected, the abnormality of the power supply can be easily monitored, and the failure of the device due to the abnormality of the power supply can be prevented beforehand.

(12) According to a twelfth aspect of the present invention, the power supply means includes a smoothing capacitor, and the control means determines that a voltage higher than a withstand voltage of the smoothing capacitor used in the power supply means is detected by the detection means. 12. The remote diagnosis system according to claim 9, wherein when the abnormality is detected, control for transmitting the abnormality to the remote diagnosis device by the communication unit is performed.

According to the present invention, when a voltage higher than the withstand voltage of the smoothing capacitor used in the power supply means is detected, the abnormality is transmitted to the remote diagnostic apparatus. Can be monitored effectively,
It is possible to prevent equipment failure due to power supply abnormality.

(13) According to a thirteenth aspect of the present invention, there is provided a power supply unit connected to an external AC power supply for supplying power of a predetermined voltage, a detection unit for detecting a voltage input to the power supply unit, and an operation unit. Operation display means for receiving and displaying status, storage means for storing predetermined information, communication means capable of communicating with the outside, and control means for performing control for monitoring a voltage abnormality detected by the detection means And a remote diagnostic system comprising a remote diagnostic device connected to the image forming device via a communication line, and
The control unit monitors an abnormality of the voltage detected by the detection unit, and when it is determined that the voltage is abnormal, control to store abnormality information indicating an abnormal state in the storage unit, When the remote diagnostic device requests the abnormality information, the remote diagnostic system controls the transmission of the abnormality information stored in the storage unit to the remote diagnostic device.

In the present invention, the abnormality information is stored,
Control is performed to transmit the abnormality information to the remote diagnosis device according to the request. For this reason, it is possible to know the occurrence of a power supply abnormality as necessary, and it is possible to prevent equipment failure due to the power supply abnormality.

(14) The remote diagnosis system according to claim 13, wherein the abnormality information includes information on the number of times the power supply voltage has become abnormal.

In the present invention, control is performed to store abnormality information relating to the number of times an abnormality has occurred, and to transmit the abnormality information to the remote diagnostic apparatus in accordance with a request. For this reason, it is possible to know the detailed situation of the occurrence of the power supply abnormality as necessary, and it is possible to prevent a device failure due to the power supply abnormality.

(15) The remote diagnosis system according to claim 13, wherein the abnormality information includes information on the date and time when the abnormality has occurred. According to the present invention, the control unit stores abnormality information relating to the date and time when the abnormality has occurred, and performs control to transmit the abnormality information to the remote diagnostic apparatus according to a request. For this reason, it is possible to know the detailed situation of the occurrence of the power supply abnormality as necessary, and it is possible to prevent a device failure due to the power supply abnormality.

(16) The invention according to claim 16 is a power supply means connected to an external AC power supply for supplying power of a predetermined voltage, a detection means for detecting a voltage inputted to the power supply means, An image forming apparatus comprising: a communication unit capable of communicating with the image forming apparatus; and a control unit configured to perform control for monitoring an abnormality of a voltage detected by the detecting unit; and a remote unit connected to the image forming apparatus via a communication line. A remote diagnosis system including a diagnosis device, wherein the control unit monitors an abnormality of the voltage detected by the detection unit, and when the voltage is determined to be abnormal, the abnormality is determined by the communication unit. A remote diagnostic system that performs control to transmit the power to the remote diagnostic device and, when an operation stop request is made from the remote diagnostic device, to shut off power supply to the image forming apparatus. .

According to the present invention, when an abnormality occurs, abnormality information is transmitted from the image forming apparatus to the remote diagnostic apparatus, and control is performed to cut off the power supply of the image forming apparatus from the remote diagnostic apparatus.
For this reason, it is possible to prevent a device failure due to a power supply abnormality.

(17) The remote diagnosis system according to any one of claims 9 to 16, wherein the power supply means outputs DC power. It is.

According to the present invention, it is possible to detect an abnormality in the power supply of the image forming apparatus that outputs DC power.

[0038]

Embodiments of the present invention will be described below in detail. First, the overall configuration of an embodiment of an image forming apparatus and a remote diagnosis system according to the present invention will be described with reference to FIG.

Here, 100 is an external AC power supply described in the claims, and is an AC commercial power supply of about 100 V or 200 V. Reference numeral 200 denotes an image forming apparatus to which the power supply according to the embodiment is applied.

FIG. 1 shows only a DC power supply unit serving as a power supply unit of the image forming apparatus and a part relating to abnormality detection of the power supply, and omits various general circuits and various units related to image formation. is there.

Reference numeral 210 denotes a DC power supply unit serving as power supply means for transforming a commercial power supply to a required voltage. A commercial power supply 100 is input to the primary side, and power of a desired voltage is output from the secondary side to each unit. You.

Inside the DC power supply section 210, a rectifying section 211 composed of a bridge diode and a smoothing section 21 having an electrolytic capacitor for smoothing a pulsating current obtained by rectification are provided.
2, a conversion means such as a DC / DC converter for converting the smoothed DC voltage into a desired voltage and outputting the converted voltage to each unit.
And a C output block.

Reference numeral 220 denotes a detection power supply for detecting an abnormality of the commercial power supply, and a detection transformer 221 comprising an insulating transformer for generating a desired detection voltage from the commercial power supply.
And a rectifier 222 composed of a bridge diode for rectifying the transformed detection voltage.

Reference numeral 230 denotes detection means for detecting a power supply abnormality based on a voltage change, and detects a power supply abnormality by monitoring a DC output voltage from the detection power supply unit 220. 240
Denotes control means for controlling the entire image forming apparatus, or at least a power supply abnormality, and comprises a CPU, a processing program, and the like. It is assumed that this processing program performs various processes such as power failure detection, power failure history management, power failure display, and power failure notification, which will be described later.

Reference numeral 250 denotes a storage unit such as a memory or a disk device, which stores, in particular, a power failure history (power failure occurrence date and time, power failure occurrence frequency, etc.) under the control of the control unit 240. It is desirable that the storage unit 250 be a nonvolatile memory from the viewpoint of history management.

Reference numeral 260 denotes operation display means provided with an operation display panel for performing an operation input by a user and a status display of the device. The operation input is input to the control unit 240, and the status display is performed by the control unit 240. You.

Reference numeral 270 denotes communication means for transmitting and receiving data via the communication line 300. In this embodiment, a case where data is transmitted and received to and from the remote diagnostic apparatus 400 is shown. The communication line 300 is various lines such as a public line and a dedicated line, and is not limited to a wired line and may be a wireless communication line.

In FIG. 1, the image forming apparatus 200 and the remote diagnostic apparatus 4 connected via the communication line 300
00 constitutes a remote diagnosis system. FIG. 2 is a circuit diagram showing an example of a specific configuration of the detecting means 230. Here, DC5V from a separately provided constant voltage source
The comparator IC1 compares the reference voltage Vref generated by the voltage dividing resistors R3 and R4 with the detected voltage V3 generated by the pulse output voltage V2 of the detection power supply unit 220 and the voltage dividing resistors R1 and R2. By doing so, an example of detecting a power supply abnormality is shown.

Here, the output voltage VAC2 of the detecting transformer 221 is a value obtained by dividing the input voltage VAC1 input from the external commercial power supply 100 by the transformer winding ratio N. In addition, the pulse output voltage V2 of the detection power supply unit 220 is equal to the voltage drop of the rectifying diode (0.7 V in the case of a silicon diode, and 0.7 ×
2 = 1.4 V), so that V2 = V1
-1.4. The detected voltage V3 is equal to the resistances R1 and R
2 and V3 = V2 × R1 / (R1
+ R2). The capacitor C1 connected in parallel with the resistor R2 is for dropping a high-frequency noise component to the ground.

Here, the operation of this embodiment will be described with reference to FIGS. In the waveform diagram of FIG. 3, the discussion will be focused on the peak value of the pulse. In such a state, when the AC input voltage VAC1 is normal, V3 <Vr
Vref is determined so as to be ef (FIG. 3A).
As a result, the comparator IC1 maintains the H level. When the AC input voltage VAC1 is abnormal, V3> Vref
The comparator IC1 outputs H / L alternating pulses (FIG. 3B).

That is, when VAC1 becomes higher than usual, the peak portion of V3 exceeds Vref, so that the detecting means 230 outputs a pulse corresponding to the peak portion of V3. The control unit 240 determines whether there is a power supply abnormality by counting the pulses. The control unit 240 determines from the pulse count that the power supply is abnormal when the count value becomes equal to or more than a certain value. If the number of pulses does not reach a certain value within a certain time, the counter is cleared.

When the number of pulses reaches a predetermined value within a predetermined time, the control unit 240 stores the date and time, the number of pulses, and the like in the storage unit 250. Further, as shown in FIG. 4, a capacitor C for smoothing the pulse output voltage V2 from the rectification unit 222 can be provided in the detection unit 230. By doing so, the waveform of V3 becomes as shown in FIG.
As shown in (a), the DC is smoothed to some extent. In such a state, when the AC input voltage VAC1 is normal, V3 <
Vref is determined so as to be Vref (see FIG. 5).
(A)). As a result, the comparator IC1 maintains the H level. When the AC input voltage VAC1 is abnormal, V
3> Vref, and the comparator IC1 maintains the H level (FIG. 5B).

That is, when VAC1 becomes higher than usual, the whole of V3 exceeds Vref, so that the detection means 230 outputs an L level signal. The control unit 240 monitors this level to determine whether there is a power supply abnormality. The control unit 240 determines that the power supply is abnormal when the state of the H level continues for a predetermined time or more. If the H level does not reach the predetermined time, the counter is cleared. Then, when the H level reaches a certain time or more, the control unit 240 causes the storage unit 250 to store the date and time, the abnormal state continuation time, the abnormal state start time, the abnormal state end time, and the like.

Here, when the communication unit 270 is connected to the remote diagnostic apparatus 400 via the communication line 300, the communication unit 270 gives the remote diagnostic apparatus 400 a power failure occurrence state (power failure occurrence) according to an instruction from the control unit 240. , Power failure date and time, and duration of power failure). As a result, the occurrence of a power supply abnormality can be known externally,
It is possible to prevent equipment failure due to power supply abnormality. In addition, if necessary, the identification number of the image forming apparatus 200 is also transmitted.

It should be noted that instead of spontaneously transmitting a power failure from the image forming apparatus 200, the remote diagnostic apparatus 40
A request may be issued periodically from 0, and in response to the request, the state of power failure occurrence (power failure date and time and duration of power failure occurrence) may be transmitted from the image forming apparatus 200 side. Further, the image forming apparatus 200 sends a simple notification to the remote diagnostic apparatus 400 when a power failure occurs, and transmits detailed information of the power failure or requested information in response to a request from the remote diagnostic apparatus 400. You may.

Further, the status of the occurrence of the power failure (power failure date and time, power failure occurrence time and duration) may be displayed on the operation display means 260 in accordance with an instruction from the control unit 240. As a result, the occurrence of the power supply abnormality can be easily known on the display unit, and the failure of the device due to the power supply abnormality can be prevented.

Instead of automatically displaying the status of the power failure, the status of the power failure (power failure date and time and duration of power failure) in response to a request from an operation (such as command input) by a serviceman or the like. May be displayed. Further, when a power failure occurs, a simple icon of the power failure may be displayed, and detailed information of the power failure may be displayed in response to a request by a serviceman's operation. Further, the configuration may be such that a service person connects a portable device to the communication unit 270 to read and display details of the power supply abnormality. By doing so, necessary information can be obtained as needed.

Further, both the transmission of the power supply abnormality to the remote diagnosis device 400 and the display of the power supply abnormality on the operation display means 260 may be performed in combination. In this case, the transmission content and the display content may be the same or different.

When the above operation is performed, by setting the above-mentioned reference voltage Vref in accordance with the withstand voltage of the electrolytic capacitor 212, it is possible to prevent the DC power supply section 210 and each circuit from being broken. . In addition, an effect of not responding to a voltage rise that has no adverse effect is obtained.

Further, when performing the above operation,
By setting a notification or display of a power failure when the duration of the power failure reaches a predetermined time or more within a certain time, it is possible to effectively monitor the power failure that needs to be investigated. In addition, destruction of the power supply circuit can be prevented. In addition, there is also obtained an effect of not reacting to a short-time voltage rise without any adverse effect.

In this embodiment, since the voltage on the secondary side of the detection transformer 221 is detected, the detection means 230 only needs to handle a voltage at which a general logic circuit operates. In addition, it is possible to easily monitor an abnormality in the power supply and prevent a device failure due to the abnormality in the power supply. Further, in this embodiment, the detection is performed using a DC voltage, so that the detection means 230 only needs to handle a DC voltage at which a general logic circuit operates, and it is possible to easily monitor the abnormality of the power supply. This can prevent equipment failure due to power supply abnormality.

Further, when a power failure occurs, the above-mentioned notification using the communication line 300 and display on the operation display means 260 are performed, but the usable state of the image forming apparatus 200 may be maintained. . Further, the setting may be made such that the device is stopped or the power supply is stopped when a power failure occurs. The stop of the device and the stop of the power supply on the image forming apparatus 200 side may be performed when the image forming apparatus 200 receives an instruction based on the result of the diagnosis by the remote diagnosis apparatus 400.

In the detection means shown in FIGS. 2 and 4, the reference voltage Vref has a single value. However, a plurality of reference voltages are provided, and a plurality of steps such as normal / caution / abnormal are provided. May be detected. In this case, depending on the detected state, an error is notified or displayed, but the device is operated.
The control state may be changed, such as stopping the device together with the notification and display of the abnormality.

Further, in the above embodiment, by keeping the history of the power supply abnormality date and time, it becomes possible to check for the presence or absence of the power supply abnormality in the event of a device abnormality or failure. Further, when a power supply abnormality occurs, it is possible to inquire of an electric power company or the like.

Note that the image forming apparatus 200 in the above embodiment includes not only a printer and a copying machine but also a facsimile apparatus having a similar image forming unit.

[0066]

As described above, according to the present invention,
An image forming apparatus and a remote diagnosis system that can prevent a failure of a device due to a power supply abnormality beforehand can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an image forming apparatus and a remote diagnosis system according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a detailed configuration example of a detection unit according to the first embodiment of the present invention.

FIG. 3 is a time chart showing an operation state of the first embodiment of the present invention.

FIG. 4 is a block diagram illustrating a detailed configuration example of a detection unit according to a second embodiment of the present invention.

FIG. 5 is a time chart showing an operation state of the second embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 commercial power supply 200 image forming apparatus 210 DC power supply section 211 rectifying section 212 electrolytic capacitor 213 DC output block 220 detecting power supply section 221 detecting transformer 222 rectifying section 230 detecting means 240 control section 250 storage means 260 operation display means 270 communication means 300 Communication line 400 Remote diagnostic device

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G05B 23/02 G05B 23/02 V (72) Inventor Hideo Yamane 2970 Ishikawacho, Hachioji-shi, Tokyo Konica Corporation In-house (72) Inventor Satoshi Sakata 2970, Ishikawa-cho, Hachioji-shi, Tokyo F-term in Konica Corporation (reference)

Claims (17)

[Claims] A power supply unit connected to an external AC power supply and supplying a predetermined voltage power; a detection unit for detecting a voltage input to the power supply unit; a communication unit capable of communicating with the outside; Control means for monitoring the abnormality of the voltage detected by the detection means, and when it is determined that the voltage is abnormal, performing control for transmitting the abnormality to the outside by the communication means. Characteristic image forming apparatus. 2. The method according to claim 1, wherein the number of times that the voltage is detected to be abnormal has reached a predetermined number.
2. The image forming apparatus according to claim 1, wherein control for transmitting the abnormality to the outside by the communication unit is performed. 3. A transformer for transforming the voltage of the external AC power supply, the external AC power supply being transformed by the transformer, and the detecting means detecting the voltage transformed by the transformer. The image forming apparatus according to claim 1, wherein: 4. The power supply means includes a smoothing capacitor. The control means detects the abnormality when a voltage equal to or higher than a withstand voltage of the smoothing capacitor used in the power supply means is detected by the detection means. The image forming apparatus according to claim 1, wherein the communication unit controls transmission to an external device. 5. A power supply unit connected to an external AC power supply for supplying a predetermined voltage power, a detection unit for detecting a voltage input to the power supply unit, an operation for receiving an operation and displaying a state. Display means, storage means for storing predetermined information, monitoring of the abnormality of the voltage detected by the detection means, when the voltage is determined to be abnormal, abnormality information indicating the state of the abnormality A control to store the information in the storage means and a control to display the abnormality information stored in the storage means to the operation display means when a request to display a voltage abnormality is made from the operation display means. An image forming apparatus comprising: a control unit. 6. The image forming apparatus according to claim 5, wherein the abnormality information includes information on the number of times the power supply voltage has become abnormal. 7. The image forming apparatus according to claim 5, wherein the abnormality information includes information on a date and time when the abnormality has occurred. 8. The image forming apparatus according to claim 1, wherein the power supply outputs DC power. 9. A power supply unit connected to an external AC power supply for supplying power of a predetermined voltage, a detection unit for detecting a voltage input to the power supply unit, a communication unit capable of communicating with the outside, A remote diagnosis system comprising: an image forming apparatus having control means for monitoring the abnormality of the voltage detected by the detecting means; and a remote diagnostic apparatus connected to the image forming apparatus via a communication line. The control means, if it is determined that the voltage is abnormal, transmits the abnormality to the remote diagnostic device by the communication means. 10. The control means performs control for transmitting the abnormality to the remote diagnostic apparatus by the communication means when the number of times that the voltage is detected to be abnormal has reached a predetermined number. The remote diagnosis system according to claim 9, wherein: 11. A transformer for transforming the voltage of an external AC power supply, wherein the external AC power supply is transformed by the transformer, and the detecting means detects the voltage transformed by the transformer. The remote diagnosis system according to claim 9. 12. The power supply means includes a smoothing capacitor, and the control means detects the abnormality when a voltage equal to or higher than a withstand voltage of the smoothing capacitor used in the power supply means is detected by the detection means. The remote diagnosis system according to claim 9, wherein the communication unit controls transmission to a remote diagnosis apparatus. 13. A power supply means connected to an external AC power supply for supplying power of a predetermined voltage, a detection means for detecting a voltage input to the power supply means, an operation for receiving an operation and displaying a state. Display means, storage means for storing predetermined information, communication means capable of communicating with the outside, control means for controlling the abnormality of the voltage detected by the detection means,
And a remote diagnostic device comprising a remote diagnostic device connected to the image forming device via a communication line, wherein the control unit monitors a voltage abnormality detected by the detecting unit. When it is determined that the voltage is abnormal, control is performed to store abnormality information indicating an abnormal state in the storage unit, and when a request for abnormality information is made from the remote diagnosis device, the storage is performed. Transmitting the abnormality information stored in the means to the remote diagnostic apparatus. 14. The remote diagnosis system according to claim 13, wherein the abnormality information includes information on the number of times the power supply voltage has become abnormal. 15. The remote diagnosis system according to claim 13, wherein the abnormality information includes information on a date and time when the abnormality has occurred. 16. A power supply connected to an external AC power supply for supplying power of a predetermined voltage, detection means for detecting a voltage input to the power supply, communication means capable of communicating with the outside, A remote diagnostic system comprising: an image forming apparatus having control means for monitoring an abnormality of a voltage detected by the detecting means; and a remote diagnostic apparatus connected to the image forming apparatus via a communication line. The control means monitors the abnormality of the voltage detected by the detection means, and when it is determined that the voltage is abnormal, transmits the abnormality to the remote diagnostic apparatus by the communication means. And performing control to cut off power supply to the image forming apparatus when an operation stop request is issued from the remote diagnostic apparatus. 17. The power supply according to claim 9, wherein said power supply means outputs DC power.
7. The remote diagnosis system according to any one of 6.