JPH09329998A - Image forming device, method for processing abnormality thereof and storing medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a device inside information even in the case of the device abnormal time, a power source short break, sudden service interruption or the like, other than the power source OFF signal operated by a user, and to dispense with a capacitor for storing the abnormal information. SOLUTION: In this device, a control part 1, on detecting conduction abnormality (power source short break or sudden service interruption) to a heater 5 of a fixing unit based on a detection signal S5 outputted from an AC state detecting circuit 37, makes ROM capable of electrically erasing/writing in (EEPROM) 31 storing and holding the device inside information. The control part 1, on judging that the temp. of a heater 1 in the fixing unit is abnormal based on the detection signal 11 by a themistor 9, makes the EEPROM 31 possible to store and hold the fixation abnormality information, inserted of saving the electric charge in the capacitor 35 in the conventional manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic type electrophotographic apparatus using a charged image, an image forming apparatus such as an electrostatic recording apparatus, an abnormality processing method and a storage medium, and more particularly, an apparatus abnormality detection processing technique. Regarding

[0002]

2. Description of the Related Art The structure of a multicolor image forming apparatus will be described below as a conventional example. FIG. 8 shows the overall structure of a conventional electrophotographic color image forming apparatus using a charged image. FIG.
As shown in FIG.
2 is held by being gripped at its tip by a gripper 103f and held on the outer periphery of the transfer drum 103. The latent image formed for each color by the optical unit 107 on the image carrier (photosensitive drum) 121 is developed by each color developing device Dy, Dc, D.
After being developed by m and Dk, it is transferred to the recording paper on the outer periphery of the transfer drum 103 a plurality of times to form a multicolor image. At this time, a high voltage is applied to the transfer drum 103 to transfer the toner onto the recording paper. Dy is a yellow developing device, Dc is a cyan developing device, Dm is a magenta developing device, and Dk is a black developing device.

Thereafter, the recording paper 102 is transferred onto the transfer drum 103.
After being separated from the sheet, the sheet is fixed by a fixing unit (fixing device) 104, and is discharged from a sheet discharge section 105 to a sheet discharge tray section 106.

Each color developing device has a rotary support shaft at both ends thereof, and each developing device mechanical portion 10 is rotatable about the shaft.
8 and each developing device is rotated for selecting a developing device while keeping its posture constant.

Next, a conventional fixing device will be described. Conventionally, a heating method has been generally adopted for fixing an unfixed image in an electrophotographic apparatus or the like, and a heat roller fixing method has been widely spread. In this fixing method, basically, a heating roller and a pressure roller that is in pressure contact with the heating roller are integrally formed, and a recording material (recording paper) supporting an unfixed image is passed between them to perform fixing.

FIG. 9 shows the appearance of a fixing unit for performing such heat fixing. However, the driving motor, gear, etc. are not drawn. In FIG. 9, 10 is a heating roller and 11 is a pressure roller, and both rollers are rotatably arranged in pressure contact with each other in order to improve the fixing property of an image.

Due to this pressure contact, the heating roller 10 and the pressure roller 11 made of rubber only cause deformation of the entire roller. Therefore, by disposing the cores 15 and 17 at the center of each roller, the deformation is prevented. Hold down. That is, at the centers of the heating roller 10 and the pressure roller 11,
A core 7 and a core metal 7 are provided to support the respective rollers, and the cores 15 and 17 are used to maintain the rigidity of the entire roller against the pressure applied between the heating roller 10 and the pressure roller 11.

Further, a halogen heater 5 which generates heat by supplying electric power is arranged at the center of the cored bar 15, as shown in FIG.
As shown in, the energization is controlled so that the resistance value of the thermistor 9, which is a temperature detecting element provided in contact with the surface of the pressure roller 11, is constant with respect to the reference value. At this time, since the temperature of the roller 11 is maintained at a predetermined temperature by the heater 5 whose energization is controlled as described above, heat and pressure are applied to the unfixed toner image on the recording paper 102,
It is fixed on the recording paper 102.

Therefore, in order to obtain a good fixing property, not only the pressure contact force between the rollers 10 and 11 is maintained at a predetermined value as described above, but also the temperatures of the heating roller 10 and the pressure roller 11 are properly adjusted. Must be kept at a value. Furthermore, the resistance value of the thermistor 9 is monitored in order to prevent abnormal heating of the fixing unit, and when an abnormality in the resistance value of the thermistor 9 is detected, the control unit 21 stops the apparatus.

The control unit 21 also stores an electric charge in the capacitor 35 by the signal S13. This signal S13 is a signal indicating an abnormality of the fixing device, and the control unit 21 detects the signal S14 at the next device startup, and when the electric charge is stored in the capacitor 35, the abnormality of the fixing device is detected. To prevent overheating, shut down the device.

Next, the structure and control of the conventional power supply unit will be described. 2. Description of the Related Art Conventionally, power-off control using a remote switch has been widely used for controlling a power supply unit in an image forming apparatus such as an electrophotographic apparatus. In this power supply control method, the control unit 21 recognizes a power OFF signal from the user without the user directly turning OFF (cutting) the AC (AC) power supply line, and based on this recognition, the EEPROM (electrically erase / The device internal information is written in the writable ROM) 31, and then the power supply is turned off from the control unit 21 to the power supply unit 32.
Send a command. After receiving the command, the power supply unit 3
The power supply from 3 is stopped by the power supply stop circuit 34. The power supply stop circuit 34 is a switch circuit using an FET (field effect transistor), an analog switch, or the like.

The EEPROM 31 supplies the internal information of the apparatus with a power source O.
The reason for writing only in FF is EEPROM31
This is because the number of times of writing is limited, and the number of times of writing is reduced as much as possible.

In the conventional apparatus, generally, the control circuit having the structure shown in FIG. 10 controls the power supply section 32, controls the temperature of the heating roller 10, and detects an abnormality. In FIG. 10, 6 is a resistance RT and a resistance R1 of the thermistor 9.
The digital value S from the voltage VT obtained by the voltage division ratio of
11 is an A / D converter (analog / digital converter) for obtaining 11. This voltage value VT shows a higher value as the temperature is higher, and the relationship between the temperature and the voltage value VT is proportional. Further, 7 is a digital value S from the control target voltage Vref.
12 is an A / D converter for obtaining 12.

The A / D converter 6 and the A / D converter 7 output the digital values S11 and S12, respectively, to the control unit 2.
Output to 1. The control unit 21 controls the digital values S11 and S12.
The energization pattern signal S3 is controlled according to the input of. When the energization pattern signal S3 is input to the power energization pattern generator 3, the power energization pattern generator 3 outputs a heater control signal S4 to the heater drive circuit 4 to AC drive the halogen heater 5. .

Under this condition, when the output signal S11 of the A / D converter 6 shows an abnormal value, the control unit 21 outputs the signal S
The electric charge is stored in the capacitor 35 by 13. When the power-off signal S15 operated by the user indicates that the power is off, the control unit 21 stores the device internal information (such as the number of printed sheets) in the EEPROM 31 by the signal S17. After that, the power supply from the power supply 33 is stopped by using the power supply stop circuit 34 by the signal S16.

Further, the control unit 21 is
The state of the capacitor 35 is detected by the signal S14, and if the capacitor 35 stores an electric charge, the device is stopped.
If no charge is stored in the capacitor 35, the device internal information is read from the EEPROM 31 by the signal S18.

Next, the conventional control operation of the control unit 21 will be described with reference to the flowchart of FIG.

First, immediately after the power of the apparatus is turned on, the control section 21 detects the state of the capacitor 35 by the signal S14 (step 401). If electric charge is stored in the capacitor 35, the process goes to step 406 and error processing is performed. If no charge is stored, go to step 402.

If no charge is stored in the capacitor 35, information such as the number of prints (also referred to as the number of prints) is retrieved from the EEPROM 31 (step 40).
2) Perform predetermined fixing device temperature control processing (step 40
3) A fixing temperature abnormality detection process is performed based on the signal S11 to detect whether the temperature of the fixing device is abnormal (step 40).
4).

If the fixing temperature is abnormal, the procedure goes to step 405 to charge the condenser 35 (step 40
5), error processing is performed (step 406), and the process goes to step 407.

If the fixing temperature is normal, step 404
To go to step 407.

In step 407, the power OFF signal S15 operated by the user is detected. If the power OFF signal S15 is OFF, the process returns to step 403 to form the loop of the above processing. If the power OFF signal S1
If 5 is ON, it means that the power supply is OFF. Therefore, the device internal information is written in the EEPROM 31 (step 408), and the power supply OFF signal S16 is turned ON (step 409). The subsequent power supply is stopped.

As described above, in the conventional case,
Only when the power is turned off, the device internal information is written in the EEPROM.

[0024]

However, in the above-mentioned conventional example, the device internal information is written in the EEPROM 31 only by the power OFF signal from the user. Therefore, in the event of a momentary power failure, a sudden power failure, or the like, writing to the EEPROM 31 was not performed, and accurate information could not be retained. In addition, when an abnormality occurs in the fixing device, the capacitor stores and holds the electric charge, so that a capacitor for that purpose is required.

The present invention has been made in view of the problems to be solved by the above-mentioned prior art, and its purpose is to provide a device other than a power-off signal from a user when there is an abnormality in the device, a momentary power interruption, It is to be able to always keep accurate information on the inside of the device even in the event of a sudden power failure or the like.

A further object of the present invention is to reduce the cost by making it possible to omit the conventional capacitor for holding device abnormality information.

[0027]

In order to achieve the above object, the present invention provides an apparatus abnormality detecting unit in an image forming apparatus having a non-volatile memory that holds apparatus internal information,
When the abnormality detecting means detects an abnormality in the device, it has a configuration for holding information in a non-volatile memory. With this configuration, the internal information of the device is written in the non-volatile memory when the device is abnormal, so that accurate information can always be held, and the cost can be reduced by omitting the capacitor.

More specifically, the present invention relates to a device abnormality detecting means for detecting an abnormality of the device, a non-volatile memory for holding internal information of the device, and a device abnormality detecting means for detecting an abnormality of the device. And a control means for holding the device internal information in the non-volatile memory. The nonvolatile memory is preferably an EEPROM, for example.

As one embodiment of the present invention, the device abnormality detecting means is an AC current detecting means for detecting an AC current supplied from a predetermined power source. For example, the AC current detection unit determines the AC current at a predetermined threshold level, converts it into a binary value into a pulse-shaped signal, and detects an abnormality in the AC current based on the presence or absence of a pulse in the signal. Further, the AC current detecting means may detect a current flowing through a heater forming the image forming apparatus.

As another embodiment of the present invention, the device abnormality detecting means is an AC voltage detecting means for detecting an AC voltage supplied from a predetermined power source.

In still another embodiment of the present invention, the apparatus abnormality detecting means is fixing abnormality detecting means for detecting an abnormality of the fixing means for fixing an image on a recording material, and the control means is the fixing abnormality. It can be characterized in that the nonvolatile memory holds the fixing abnormality information when the detecting unit detects the abnormality of the fixing unit. The fixing abnormality detecting means detects the fixing temperature abnormality by comparing the temperature detected by the fixing temperature detecting means for detecting the temperature of the fixing means with a specified value.

The image forming apparatus of the present invention can be, for example, an electrophotographic apparatus using a charged image.

According to the method of the present invention, in the abnormality processing method of the image forming apparatus having the non-volatile memory for holding the internal information of the apparatus, a power abnormality detecting step of detecting a power abnormality of the apparatus and the power abnormality detecting step. And a control step of causing the nonvolatile memory to hold device internal information when an abnormality in the power supply is detected.

Another embodiment of the method of the present invention is an abnormality processing method for an image forming apparatus having a non-volatile memory for holding information inside the apparatus, wherein an abnormality of a fixing unit for fixing an image on a recording material is detected. There is a fixing abnormality detecting step for detecting, and a control step for holding fixing abnormality information in the nonvolatile memory when the apparatus abnormality is detected in the fixing abnormality detecting step.

Still another embodiment of the method of the present invention is an abnormality processing method for an image forming apparatus having a non-volatile memory for holding internal information of the apparatus, in which a fixing abnormality is detected from the non-volatile memory immediately after power-on. If there is information about the fixing abnormality, a predetermined error process is performed if there is information about the fixing abnormality, and if there is no information regarding the fixing abnormality, the temperature of the fixing device is controlled to perform fixing. A step of performing a process of detecting an abnormality in temperature,
When an abnormality in the fixing temperature is detected, a step of writing information about the abnormality in the fixing to the nonvolatile memory and performing a predetermined error process, and when the fixing temperature is normal, an abnormality in the power supply of the apparatus is detected. The presence or absence of power supply is detected by the output signal of the detection means, and when the pulse of the output signal is not generated, the step of writing the device internal information in the nonvolatile memory, and the power supply OF operated by the user
If the F signal is detected and the power OFF signal is ON, the internal information of the device is written in the nonvolatile memory, and the power supply thereafter is stopped.

The storage medium storing the processing procedure of each step described in the method of the present invention is included in the present invention.

[0037]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First Embodiment) A first embodiment of the present invention will be described with reference to FIGS. In addition, the same parts as those of the conventional example shown in FIGS. 8 to 10 are denoted by the same reference numerals and the description thereof will be omitted.

FIG. 1 shows the configuration of a circuit for controlling the power supply unit 38, controlling the temperature of the heating roller 10 and detecting an abnormality according to the first embodiment of the present invention. In FIG. 1, 1 is a control unit of the first embodiment, 37 is an AC state detection circuit, and 38 is a power supply unit. The AC state detection circuit 37 is included in the power supply unit 38, and includes the heater drive circuit 4, the power supply 33, and the power supply stop circuit 3.
It is possible to detect the AC voltage or current supplied to the heater drive circuit 4 by being connected to the AC power supply line between the four, and the detection signal S5 is output to the control unit 1. Other configurations are similar to those of the conventional example shown in FIGS.

Next, referring to FIGS. 2 to 4, the above A
A method of detecting the current flowing through the halogen heater 5 in the C state detection circuit 37 will be described. FIG. 2 shows the relationship between the AC current on the AC power supply line and the detection signal S5 output from the AC state detection circuit 37. As shown in FIG. 2, the AC state detection circuit 37 cuts out a part of the absolute value of the AC current at a predetermined threshold level (threshold value) and converts it into a binary value to obtain a pulsed signal S5. The control unit 1 detects the AC current depending on the presence or absence of the pulse of the signal S5.

FIG. 3 shows the states of the voltages of the AC system and the 5V system when the power supply is suddenly cut off. The power supply unit 38 has a circuit that automatically turns off the 5V system when the voltage drops below a certain threshold level when the voltage drops. As shown in FIG. 3, about 50 ms elapses after the supply of AC power is stopped and the 5V system is turned off.

Therefore, as shown in FIG. 4, when the wave of the AC current becomes small, the detection pulse S5 of the AC current gradually becomes small, and when it becomes a certain level or less, the pulse of the signal S5 completely disappears and the AC current becomes smaller. Considered not flowing. When the pulse of the signal S5 disappears, the control unit 1
The power supply is considered to have stopped. Then, the control unit 1
Before the 5V system is turned off, the storage information (apparatus internal information) is written in the EEPROM 31. As a result, accurate information can be retained.

Next, referring to the flowchart of FIG.
The control operation of the control unit 1 of FIG. 1 will be described. First, immediately after the power is turned on, the control unit 1 detects the state of the capacitor 35 by the signal S14 (step 201). If capacitor 3
If the charge is stored in 5, the process proceeds to step 206 and error processing is performed. If no electric charge is stored in the capacitor 35, the process proceeds to step 202.

If no electric charge is stored in the capacitor 35, the storage information (internal information of the apparatus) such as the number of prints is taken out from the EEPROM 31 (step 20).
2) Perform predetermined fixing device temperature control processing (step 20
3) A fixing temperature abnormality detection process is performed to detect whether the temperature of the fixing device 104 is abnormal based on the signal S11 (step 2).
04).

If the fixing temperature is abnormal, the process proceeds to step 205, the electric charge is stored in the capacitor 35 (step 205), error processing is performed (step 206), and the process proceeds to step 207.

If the fixing temperature is normal, step 204
Then, go to step 207 as it is.

In step 207, the presence or absence of power supply is detected by the signal S5, and if the pulse of the signal S5 is not generated, the stored information is written in the EEPROM 31, and the process proceeds to step 209. When the pulse is generated, the process directly goes to step 209.

In step 209, the power OFF signal S15 operated by the user is detected. If the power OFF signal S15 is OFF, the process returns to step 203 and the above processing loop is formed. If the power OFF signal S15 is ON, it means that the power is OFF.
The storage information is written in the EEPROM 31 (step 21
0), the power OFF signal S16 is turned ON (step 2
11). The subsequent power supply is stopped.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. 6 and 7. In addition, FIG.
The same parts as those of the first embodiment shown in FIG. 5 are designated by the same reference numerals and the description thereof will be omitted.

FIG. 6 shows the power supply unit 3 according to the second embodiment of the present invention.
2 shows the configuration of a circuit for performing the control of No. 2, the temperature control of the heating roller 10 and the abnormality detection.

In FIG. 6, reference numeral 41 is a control unit of the second embodiment. In this example, the control unit 41 prevents abnormal heating of the fixing device 104 by writing the fixing abnormality information indicating that the fixing temperature is abnormal to the EEPROM 31 without storing the charge in the capacitor after detecting the fixing temperature abnormality. There is. Therefore, in the configuration of this example, as shown in FIG. 2, the capacitor 35 of FIG. 1 is unnecessary and is therefore omitted.

Next, the control operation of the control unit 41 of FIG. 6 will be described with reference to the flowchart of FIG. First, immediately after the power is turned on, the control unit 41 takes out information such as the fixing abnormality and the number of prints from the EEPROM 31 (step 301). If the fixing is abnormal, the process goes to step 306 to perform error processing, and then to step 307. go.

If the fixing is not abnormal, go to step 303. In step 303, fixing device temperature control processing is performed, and in the next step 304, fixing temperature abnormality detection processing is performed.

If the fixing temperature is abnormal, the procedure goes to step 305, the fixing abnormality information is written in the EEPROM 31, error processing is performed (step 306), and then the procedure goes to step 307.

If the fixing temperature is normal, step 304
To go directly to step 307.

In step 307, the power OFF signal S15 operated by the user is detected. If the power OFF signal S15 is OFF, the process returns to step 303 to form the loop of the above processing. If the power OFF signal S1
If No. 5 is ON, the device internal information is written in the EEPROM 31 (step 308), and the power OFF signal S16 is turned ON (step 309). The subsequent power supply is stopped.

In the second embodiment, the conventional capacitor 3
Since the configuration is such that the EEPROM 31 is used instead of 5 instead of 5, the circuit configuration is simplified and the cost can be reduced.

(Other Embodiments) It is more preferable to combine the first embodiment and the second embodiment of the present invention described above, because the advantages of both can be obtained. In this case, the AC state detection circuit 37 of FIG. 1 is added to the circuit of FIG. 6 in a connection relationship similar to that of FIG. 1, and the processing procedure of steps 207 and 208 of FIG. 5 is inserted immediately before step 307 of FIG. Will be done.

In the above-described embodiment of the present invention, the abnormality of the fixing device is exemplified as the target of the device abnormality detection, but the present invention is not limited to this. For example, the paper feeding portion, the transfer drum, the optical unit, the developing device, Abnormalities in other components of the image forming apparatus such as the photosensitive drum can be similarly applied.

In the above-described embodiment of the present invention, the EEPR is used as a memory for writing the storage information and the fixing abnormality information.
Although the OM is exemplified, it goes without saying that another non-volatile memory may be used.

Further, in the above-described embodiment of the present invention, the abnormality of the fixing temperature is exemplified as the abnormality of the fixing, but the abnormality can be included in the abnormality of the fixing pressure.

Further, the present invention is not limited to analog copying machines, digital copying machines, and printers such as laser beam printers and LED printers, but can be applied to various devices such as facsimile machines and ticket issuing machines having a printing mechanism. .

Further, the present invention is not limited to the electrophotographic image forming apparatus using a charged image, but can be applied to other image forming apparatus.

Furthermore, the present invention may be applied to a system composed of a plurality of devices or an apparatus composed of a single device. Further, it goes without saying that the present invention can be applied to the case where it is achieved by supplying a program to a system or an apparatus. In this case, by reading a storage medium storing a program represented by software for achieving the present invention into the system or the apparatus, the system or the apparatus can enjoy the effects of the present invention. Becomes

[0065]

As described above, according to the present invention,
In the event of a device failure, momentary power failure, or sudden power failure, it is detected and the error information and necessary device internal information are written to the non-volatile memory, so accurate information is always maintained. It is possible to obtain the effect that the cost can be reduced by omitting the capacitor.

[Brief description of drawings]

FIG. 1 is a control block diagram showing a circuit configuration of an image forming apparatus according to a first embodiment of the present invention.

FIG. 2 is a waveform diagram showing a relationship between a supply current and a signal S5 at a normal time according to the first embodiment of the present invention.

FIG. 3 is a timing chart when the power supply is stopped in the first embodiment of the present invention.
It is a state diagram which shows the mode of V and 100V.

FIG. 4 is a waveform diagram showing the relationship between the supply current and the signal S5 immediately after the power supply is turned off according to the first embodiment of the present invention.

FIG. 5 is a flowchart showing a control operation of the control unit 1 according to the first embodiment of the present invention.

FIG. 6 is a control block diagram showing a circuit configuration of an image forming apparatus according to a second embodiment of the present invention.

FIG. 7 is a flowchart showing a control operation of a control unit 41 according to the second embodiment of the present invention.

FIG. 8 is a cross-sectional view showing the internal structure of the entire conventional image forming apparatus.

FIG. 9 is a perspective view showing a configuration of a heating roller and a pressure roller of a conventional fixing device that performs heat fixing.

FIG. 10 is a control block diagram showing a circuit configuration of a conventional image forming apparatus.

FIG. 11 is a flowchart showing a control operation of a conventional image forming apparatus.

[Explanation of symbols]

 1, 41 Control unit 3 Electric power energization pattern generator 4 Heater drive circuit 5 Halogen heater 6,7 A / D converter 9 Thermistor (temperature detection element) 10 Heating roller 11 Pressure roller 15, 17 Core metal 31 EEPROM 32, 38 Power supply Part 33 Power Supply 34 Power Supply Stop Circuit 35 Condenser 37 AC State Detection Circuit 101 Paper Feeding Part 102 Recording Material (Recording Paper) 103 Transfer Drum 104 Fixing Unit (Fixer) 107 Optical Unit 108 Developing Device Mechanism 121 Image Carrier (Photosensitive) drum)

Claims (15)

[Claims] 1. A device abnormality detecting means for detecting an abnormality of the device, a non-volatile memory for holding information inside the device, and a device for storing the non-volatile memory when the device abnormality detecting means detects an abnormality of the device. An image forming apparatus comprising: a control unit that holds internal information. 2. The image forming apparatus according to claim 1, wherein the non-volatile memory is an EEPROM. 3. The image forming apparatus according to claim 1, wherein the device abnormality detecting unit is an AC current detecting unit that detects an AC current supplied from a predetermined power source. 4. The AC current detection means according to claim 3, wherein the AC current is judged at a predetermined threshold level and converted into a binary value to obtain a pulsed signal,
An image forming apparatus, wherein an abnormality of an AC current is detected by the presence or absence of a pulse of the signal. 5. The image forming apparatus according to claim 1, wherein the device abnormality detecting unit is an AC voltage detecting unit that detects an AC voltage supplied from a predetermined power source. 6. The image forming apparatus according to claim 3, wherein the AC current detecting unit detects a current flowing through a heater that constitutes the image forming apparatus. 7. The apparatus abnormality detection unit according to claim 1, wherein the apparatus abnormality detection unit is a fixing abnormality detection unit that detects an abnormality of a fixing unit that fixes an image on a recording material, and the control unit has the fixing abnormality. An image forming apparatus, wherein the non-volatile memory holds fixing abnormality information when the detecting unit detects abnormality of the fixing unit. 8. The fixing abnormality detecting means according to claim 7, wherein the fixing temperature detecting means detects the fixing temperature abnormality by comparing the temperature detected by the fixing temperature detecting means for detecting the temperature of the fixing means with a specified value. An image forming apparatus characterized by the above. 9. The image forming apparatus according to claim 1, wherein the image forming apparatus is an electrophotographic apparatus that uses a charged image. 10. An abnormality processing method for an image forming apparatus having a non-volatile memory for holding information inside the apparatus, comprising: a power source abnormality detecting step of detecting a power source abnormality of the apparatus; and a power source abnormality detecting step in the power source abnormality detecting step. And a control step of causing the non-volatile memory to hold the device internal information when the detection is performed. 11. An abnormality processing method for an image forming apparatus having a non-volatile memory for holding information inside the apparatus, a fixing abnormality detecting step for detecting an abnormality of a fixing unit for fixing an image on a recording material, and the fixing. And a control step of holding the fixing abnormality information in the non-volatile memory when an abnormality of the apparatus is detected in the abnormality detection step. 12. An abnormality processing method for an image forming apparatus having a non-volatile memory for holding the internal information of the apparatus, wherein a step of taking out internal information of the apparatus such as a fixing abnormality and the number of prints from the non-volatile memory immediately after power-on. If there is information on the fixing abnormality, a predetermined error process is performed; if there is no information on the fixing abnormality, a process of controlling the temperature of the fixing device is performed, and a process of detecting an abnormality of the fixing temperature is performed. When the abnormality of the fixing temperature is detected, a step of writing the information of the abnormality of the fixing to the nonvolatile memory and performing a predetermined error process, and when the fixing temperature is normal, a power supply for detecting an abnormality of the power supply of the apparatus. The presence or absence of power supply is detected by the output signal of the abnormality detecting means, and when the pulse of the output signal is not generated, the nonvolatile memory is provided with the internal device. It includes a step of writing information, a step of detecting a power OFF signal operated by a user, and if the power OFF signal is ON, writing the device internal information to the nonvolatile memory and stopping the power supply thereafter. An abnormality processing method for an image forming apparatus, comprising: 13. A storage medium in which the processing procedure of each step according to claim 10 is stored. 14. A storage medium storing the processing procedure of each step according to claim 11. 15. A storage medium in which the processing procedure of each step according to claim 12 is stored.