JPS6222854Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an electronic circuit device including an electronic circuit having a check terminal.

[Technical background of the invention]

Conventionally, in electronic circuit devices equipped with electronic circuits such as ICs, a test mode is programmed into the electronic circuit by connecting the electronic circuit to a conductor pattern on an insulating substrate and then connecting a jump wire to the check terminal of the electronic circuit. If this is executed normally, the electronic circuit is judged to be normal and the check is completed, the aforementioned jump wire is cut and the insulating substrate is assembled into the case.

[Problems with background technology]

In the conventional configuration, it is necessary to cut the jump wire after checking in the test mode, which is cumbersome, and if it is necessary to check again due to a failure etc. after assembling the insulating board to the case, the insulating board After removing it from the case, it was necessary to reconnect the jump wire to the check terminal of the electronic circuit, which was still a tedious task.

[Purpose of invention]

The present invention has been made in view of the above circumstances, and its purpose is to provide an electronic circuit device in which checking and re-checking of the test mode is extremely easy.

[Summary of the idea]

In the present invention, the first mounting hole is one of the plurality of mounting holes.
An insulating board is provided, the mounting hole of which is connected to the negative terminal of the DC power supply through a conductor pattern, and a check terminal is connected to the other one of the plurality of mounting holes through the conductor pattern to this insulating board. An electronic circuit connected to the second mounting hole is provided, a resistor is connected between the check terminal of the electronic circuit and the positive terminal of the DC power supply, and the insulating substrate is connected to the plurality of mounting holes. The structure includes a metal case that can be mounted with mounting screws, and the check terminal of the electronic circuit is at high level before the insulating board is attached to the case, and the check terminal is at low level when the insulating board is attached to the case. This is what I did.

[Example of idea]

An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a printed circuit board which is an insulating substrate, on which a large number of conductor patterns are formed. Moreover, this printed circuit board 1 has a plurality of mounting holes (2 and 3).
(only two of them are shown) are formed, and one of the mounting holes, the first mounting hole 2, is connected to the negative terminal of the DC power supply 5 via the conductor pattern 4. 6 is a CPU which is an electronic circuit, and its many terminals are connected to the aforementioned many conductor patterns. Further, the negative power input terminal 6a of this CPU 6 is connected to the conductor pattern 4 and hence the negative terminal of the DC power supply 5 via the conductor pattern 7, and the positive power input terminal 6b is connected to the positive terminal of the DC power supply 5 through the conductor pattern 8. It is connected to the. A check terminal 6c of the CPU 6 is connected to a second mounting hole 3, which is another one of the plurality of mounting holes, via a conductive pattern 9. 10 is a resistor, one end of which is connected to the CPU
6, and the other end is connected to the positive terminal of the DC power supply 5. Reference numeral 11 denotes a metal case, which has a plurality of screw holes corresponding to the plurality of mounting holes of the printed circuit board 1 (screw holes 12 and 13 corresponding to the mounting holes 2 and 3).
(only shown) is formed. Then, the mounting screws 14 and 15 are inserted into the mounting holes 2 and 3 of the printed circuit board 1 and inserted into the cylindrical spacer members 16 and 17, and then screwed into the screw holes 12 and 13 of the case 11, and the other screws are inserted. The mounting screws are also inserted into other mounting holes of the printed circuit board 1, inserted into other spacer members, and then screwed into other screw holes (none of which are shown) of the case 11, so that the printed circuit board can be fixed. 1 is attached to a case 11 and assembled.

Next, the operation of this embodiment will be explained.

Before attaching the printed circuit board 1 to the case 11
When checking the CPU 6, the second mounting hole 3 is electrically open, so the CPU 6
The check terminal 6c is connected to the resistor 1 by the DC power supply 5.
becomes high level through 0, thereby
The test mode of the CPU 6 is executed to check whether it is good or bad.

When the printed circuit board 1 is attached to the case 11 after completing the check in the test mode of the CPU 6, the check terminal 6c of the CPU 6 is connected to the conductor pattern 9, the mounting screw 15, the case 11, and the mounting screw 14.
The check terminal 6c is connected to the negative terminal of the DC power source 5 via the conductor pattern 4 and the check terminal 6c becomes a low level, thereby causing the CPU 6 to execute the normal mode.

On the other hand, if you want to recheck the CPU 6 after installing and assembling the printed circuit board 1 in the case 11, remove the mounting screws 15 from the case 11.
When the electrical connection between the mounting hole 3 and the conductor pattern 9 and the case 11 is quickly cut off, the DC power supply 2
The high level, which is the positive potential of
The signal is now applied to the check terminal 6c of the CPU 6, and the CPU 6 executes the test mode again.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but may be implemented with appropriate modifications within the scope of the gist.

[Effect of idea]

As is clear from the embodiments described above, the present invention provides an insulating substrate in which the first mounting hole, which is one of the plurality of mounting holes, is connected to the negative terminal of the DC power supply via a conductive pattern, An electronic circuit is provided which is connected to the plurality of conductor patterns of the insulating substrate and has a check terminal connected to a second mounting hole, which is another one of the plurality of mounting holes, through the conductor pattern. A resistor is connected between the check terminal of the DC power supply and the positive terminal of the DC power supply, and a metal case is provided to which the insulating board is mounted with mounting screws through the plurality of mounting holes. Before attaching the insulating board to the case, the high level of the DC power supply is applied to the check terminal of the electronic circuit through a resistor, so unlike conventional methods, test mode can be executed without connecting the jump wire to the check terminal. In addition, by attaching the insulating board to the case with the mounting screws, the check terminal of the electronic circuit automatically becomes low level, which eliminates the need to cut the jump wire unlike in the past. The checking work becomes extremely simple, and when the electronic circuit is to be checked again after the insulating board is attached to the case and assembled, the electronic circuit can be removed by removing the mounting screw corresponding to the second mounting hole from the case. The test mode can be executed, and therefore, unlike conventional methods, there is no need to reconnect the jump wire to the check terminal of the electronic circuit after removing the insulating board from the case, making re-checking extremely easy. This has practical effects such as simplicity.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention;
FIG. 2 is a block diagram of the same embodiment. In the drawing, 1 is a printed circuit board (insulating board), 2 and 3 are first and second mounting holes, 4 is a conductor pattern, 5 is a DC power supply, 6 is a CPU (electronic circuit), 7 to 9 are conductor patterns, 10 is a resistor, 11 is a case, and 14 and 15 are mounting screws.

Claims (1)

[Scope of utility model registration request] An insulating board on which a large number of conductive patterns are formed and a plurality of mounting holes, one of which is a first mounting hole, is connected to a negative terminal of a DC power supply via the conductive pattern. and an electronic circuit connected to the conductor pattern of the insulating substrate and having a check terminal connected to a second mounting hole, which is another one of the plurality of mounting holes, via the conductor pattern;
The circuit includes a resistor connected between a check terminal of the electronic circuit and a positive terminal of the DC power supply, and a metal case to which the insulating substrate is mounted with mounting screws through the plurality of mounting holes. An electronic circuit device.