JPS6137822B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diagnostic method for facsimile devices.

FIG. 1 is a block diagram for explaining the diagnosis method of a conventional facsimile device, in which 1 is an image information reading circuit, 2 is a memory circuit for storing read data, and 3 is data read from the memory circuit. 5 is a demodulator for demodulating the facsimile signal sent from the transmission line to the receiving terminal 6 and reproducing the image signal. circuit, 7
is a printer circuit that converts the demodulated image signal into a visible image, and these constitute a common facsimile device.

In such a conventional facsimile device, switches S1 to S4 shown in FIG. 1 are provided to diagnose the device itself. As is clear, each of these switches is connected as shown in the figure in normal use.

During diagnosis, first switch S4 is closed,
The image signal of the diagnostic original 8 read by the image information reading circuit 1 is supplied to the printer circuit 7 via a switch S4 between terminals 4 and 6, so that a reproduced image 9 is output. That is, the diagnostic manuscript 8 is read and reproduced by one device.

As a result of such diagnosis, if the image quality (resolution, contrast, etc.) of the reproduced output image 9 is below the standard, conventionally, the defective location has been diagnosed using one of the following methods.

1 Change the image quality of the reproduced output image (degree of improvement) by replacing the components of each functional block individually.
See.

2. Switch S1 to S3 in FIG. 1 as appropriate to short-circuit some or all of the blocks for each function, and observe changes in the image quality of the reproduced image.

However, in these diagnostic methods, it takes time and effort to set up the diagnostic manuscript 8, and each method has the following drawbacks.

In method 1, in order to diagnose each detailed component block, it is necessary to replace each finely divided component or block. Therefore, diagnosis takes a long time and work efficiency deteriorates.

With method 2, it is not possible to diagnose the reading head, which is the first part of the system, or the recording head, which is the last part, and it is not possible to short-circuit only one of the modulation circuit 3 and demodulation circuit 5. , the target of diagnosis must be roughly divided, and detailed diagnosis cannot be made.

In order to improve the drawbacks of the prior art described above, the present invention provides a method for transmitting signals from a diagnostic signal generation circuit to the input side of several functional blocks without using a diagnostic manuscript.
The present invention provides a diagnostic method for a facsimile device that can perform quick and accurate diagnosis at a desired level of detail by switching and inputting diagnostic signals suitable for each.

FIG. 2 shows a schematic block diagram of an embodiment of the present invention. In the figure, the same numbers as in Figure 1 represent the same parts. 10 is a diagnostic signal generation circuit that generates various test pattern signals required as inputs for each component block of the facsimile device to be diagnosed; 10A to 10D are signal output terminals thereof; S5 to S5;
S7 is a changeover switch, and S8 is an on/off switch.

Now, for example, when diagnosing the printer circuit 7, the changeover switch S7 is switched to the terminal 10D side, and the test pattern signal from the signal output terminal 10D of the diagnostic signal generation circuit 10 is supplied to the printer circuit 7. Then, by looking at the recording result of the reproduced output image 9 obtained at that time, it is possible to diagnose the normality of the printer circuit 7.

When it is confirmed that the printer circuit 7 is normal in this manner, the switch S7 is switched to the facsimile machine side, and the switch S8 is turned on. As a result, a predetermined test pattern signal is input to the input of the demodulation circuit 5 from the terminal 10C of the diagnostic signal generation circuit 10. As before,
The normality of the demodulation circuit 5 is diagnosed depending on whether a suitable reproduced output image can be obtained from the printer circuit 7.

Similarly, the normality of the modulation circuit 3, memory circuit 2, and image information reading circuit 1 can be diagnosed by switching the switches S4 to S6.

As is clear from the above description, according to the present invention, when diagnosing a facsimile machine, the troublesome task of setting a diagnostic original is eliminated, and the resolution for diagnosis is improved compared to the prior art.

In other words, if the elements constituting the facsimile device are subdivided into a large number of blocks, and a changeover switch is provided on each input side, and the diagnostic signal generation circuit 10 is also provided with output terminals corresponding to these blocks, It becomes possible to easily and quickly diagnose one's own device with desired detail.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining a conventional diagnosis method for a facsimile machine, and FIG. 2 is a block diagram for explaining an embodiment of the present invention. 1... Image information reading circuit, 2... Memory circuit, 3
... Modulation circuit, 5 ... Demodulation circuit, 7 ... Printer circuit, 9 ... Reproduction output image, 10 ... Diagnostic signal generation circuit.

Claims (1)

[Claims] 1 Image information reading device, device that modulates the read image information and sends it to the transmission line, device that demodulates the modulated image signal received from the transmission line, and reproduces and outputs the image signal according to the demodulated image signal. A diagnostic method for a facsimile device consisting of a printer circuit, etc., in which a switch short-circuits a sending terminal for sending a modulated signal to a transmission line and a receiving terminal for receiving a facsimile signal sent by the transmission line;
and provided on the input side of each block constituting the facsimile device, except for the image information reading device, for switching and inputting the output signal from the previous stage and the corresponding test pattern signal from the diagnostic signal generation circuit. A changeover switch is provided, and corresponding test pattern signals are inputted to the facsimile device sequentially from the changeover switch closest to the printer circuit through the changeover switch, and the reproduced image output from the printer circuit is changed in accordance with the test pattern signal. Therefore, a diagnostic method for a facsimile apparatus is designed to diagnose the normality of the constituent blocks after the changeover switch.