JPS58213264A - Connecting state deciding device of connector - Google Patents

Abstract

PURPOSE:To decide exactly a connecting state of a connector, by deciding a fault whether a test signal sent out through a connector part from an output side is received through the connector part by an input side or not. CONSTITUTION:When a fault, etc. occurs in an apparatus, and it is caused from a connector part, when a start switch is turned on, a ''1'' level signal is outputted to an exclusive output line 51 for checking. This signal is transmitted to a lead wire 63 through a pin 61 and is transmitted to a pin 62 when a connecting state of a connector 60 is normal. This ''1'' level signal is read in a CPU56 through an exclusive input line 52 for checking. The CPU56 decides that the connecting state of the connector 60 is normal, due to a fact that the sent- out ''1'' level signal is returned again. Subsequently, the output line 51 outputs a ''0'' level signal, checks whether it is returned to a CPU1 or not in the same way, and decides it to be normal when said signal is returned. By executing a double check in this way, a decision error is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connector connection state determining device that can accurately check the connection state of connectors connected to equipment.

Conventionally, in order to detect the faulty part when an electronic device malfunctions, measurement points are determined based on experience, and a testing device such as a tester is used to check whether the measurement point is normal or not. . Such a failure (abnormality) detection method can relatively reliably detect a phenomenon that appears accurately, such as a glint board.

However, with conventional failure detection means, when the purpose is to detect failures or abnormalities in connectors, these do not appear as unique phenomena, so repair personnel have to use their intuition and experience. It is unnecessary to take time to discover poor contact (or non-contact state) of connectors, and there is a possibility that forgetting to insert a connector located deep inside the device may not be detected.

The present invention has been made in view of the above, and in order to accurately determine the connection state of connectors, a test signal sent from the output side through the connector part is sent to the input side through the connector part. An object of the present invention is to provide a connector connection state determining device that determines that the connector is normal when it receives the connector.

The connector connection state determining device according to the present invention will be explained in detail below. Figure 1 shows an embodiment of the present invention, and shows a central processing unit (CP)
A configuration is exemplified in which a circuit unit (f IJ component board or a single device) 50 having a U ) 51 is connected to another circuit unit (or an input/output device) 70 via a connector 60 . The circuit section 50 has a plurality of input/output lines for exchanging necessary information with the circuit section 70 and an output line 51 and an input line 52 dedicated for fault checking from an output interface 53 and an input interface 54. They are pulled out and connected to each contact of the connector 60 in a specified arrangement order. The output interface 53 and the input interface 54 are connected to each of a CPU (central processing unit) 56, a ROM (read only memory) 57, and a RAM (random access memory) 58 via a path 55. The CPU 56 inputs information, data, etc. from the input interface 54 according to the program stored in the ROM 57, performs predetermined control calculation processing, etc.
It has a function of storing results and data in the AM 58, stopping the original program execution at a predetermined time, and running a program for connection state determination processing according to the present invention. This program switching is performed by a specific startup switch (maintenance mode switch) provided in the circuit section 50. It should be noted that each circuit section 70 has a contact (including a pin) 61 corresponding to an output bit provided exclusively for failure checking of the connector 60 and a contact (including a pin) 62 corresponding to an input pit. A short circuit is made with the lead wire 63.

In the above configuration, when a failure or the like occurs in the equipment and the cause is to be determined in the connector section, when the start switch is turned on, a ``1'' level signal is output to the output line 52 exclusively for checking. If the connection state of the connector is normal, this signal is transmitted to the lead wire 63 via the pin 61 and then to the pin 62. The @1” level signal transmitted to the bin 62 is sent to the CPU 56 via a check-only input line 52.
is loaded into. The CPU 56 determines that the connection state of the connector 60 is normal when the sent @1# level signal returns again. Then, output line 5
1 outputs the ``'O# level signal, and similarly the CPU 51
Check whether it returns to normal or not, and if it returns, it is determined to be normal. In this way, double checking prevents false judgments. Note that if the signal levels of the output line 51 and the input line 52 are different, a failure detection signal is output.

Note that equipment that performs complex control or processing is usually equipped with multiple connectors. In addition to providing a unique number for each connector, a unique number is assigned to each connector in advance to identify a faulty connector, and after sequential checking, the number of the connector in which an abnormality such as a connection failure is detected is stored in the memory 54, Displayed on a display (not shown) at a predetermined time.

Figure 2 shows the configuration when the invention is applied to a copying machine,
The same reference numerals are used for the same parts as in Fig. 1, and the numeric keypad 1 used in the explanation and the display unit 2 (console) that displays the contents specified by the numeric keypad 1, operating status, etc. are connected. A connector 60 for connecting external equipment, auxiliary circuits, etc. is directly mounted on the printed board or connected by cable. The circuit section 10 includes an input interface 11 that is connected to the numeric keypad 1 and sends the information to a path 12, and a nozzle 12 for storing programs for performing various controls and programs for determining the connection state of the connector. A ROM (read only memory) 13 connected to the path 12, a CPU 14 connected to the path 12 for performing various controls and calculations based on the contents of the ROM 13, and data and calculation results by the CPU 14, etc. A RAM (Random Access Memory) 15 connected to the path 12 for temporarily storing the data, and a RAM (Random Access Memory) 15 connected to the path 12 for temporarily storing the display content determined by the CPU 14 and outputting a signal for displaying the display content determined by the CPU 14 on the display unit 2. Output interface 16 connected to and other circuits (other devices) via connector 60
Pass 1 for exchanging data, information, etc. and input/output of commands with
2, an input interface 18 that inputs a check signal from the connector 60 and outputs it to the path 12, and an input interface 18 that inputs a check signal from the connector 60 and outputs it to the path 12. Non-volatile RAM that has the function of continuing to store information and is connected to the path 1
9 Toyoshi composition field is available. The ROM 13 stores programs for determining the connector connection state according to the present invention as well as programs for executing various controls for operating the copying machine.

In the above configuration, when a failure occurs, a predetermined key number for failure determination (for example, combinations of numbers that affect the number of copies, such as oo, ooo, etc.) is input from the numeric keypad to start the failure determination routine. let CPU
14 is the output interface 17 and υ output line 61 is 11
``level signal is output, and the ``''1#1# level signal is input to the input interface 18 via the connector 60. If the connection of the connector 60 is complete, the input yl? of the input interface 18 is input. The 11# level signal is input to the input interface 18.
2, and the CPU 14 determines that the connector connection is complete. Then, the CPU 14 “
0# level signal t is sent from the output interface 17 to the bin 61 of the reconnector 60 and sent to the input interface 18 via the lead wire 63 and input line 52.

In this case as well, if the connector connection is complete, the 10'' level signal is taken into the input interface 18, data corresponding to the signal content is sent to the path 12, and the CPU 14 again determines that the connector connection is complete. Such a determination is made sequentially for all connectors, and the results are displayed on the display section 2.

On the other hand, if a 10" level signal is received in the input interface 18 each time the check signal is sent for each connector twice as described above, the CPU 14 will notify that there is an abnormality in the connection of the connector. Determine the number of the connector and output the number of that connector to the interface 16
The number is displayed on the display unit 2 via the numeral 2, and the number is stored in the non-volatile RAM 19.6 FIG.

As described above, according to the connector connection state determination device of the present invention, it is determined whether or not a test signal sent through the connector section on the output side is received at the input side via the connector section. ), so
The connection state of the connector can be accurately determined.

[Brief explanation of drawings]

FIG. 1 is a connection diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing an example in which the present invention is applied to a copying machine, and FIG.
3 is a flowchart showing the processing contents of the embodiment shown in the figure. 1... Numeric keypad, 2... Display, 10,50°70
...Circuit section, 11,18.54...Input interface, 12.55...Nos, 13.57...R
OM, 14.56...CPU, 15.58...RA
M. 16.17.53...Output interface, 19.
...Nonvolatile RAM, 51...Output line, 52...
Input line, 60...connector, 61.62...contact,
63... Lead wire. 2nd figure ~ 3 figure

Claims (1)

[Scope of Claims] An electronic device comprising a control unit that outputs, via a connector, a control signal that causes a part to perform a predetermined operation in accordance with the command signal when a command signal that instructs the operation of each part is input, The connector includes a test terminal that outputs a test signal when the test signal is input, and the control unit outputs the test signal when a test mode is instructed, and outputs the test signal through the test terminal of the connector. inputting the test signal to determine the connection state of the connector;
A connector connection state determining device characterized in that the determination result is stored in a nonvolatile memory together with an identification number of the connector.