JPH11298107A - Printed board comprising test point - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printed board comprising test point wherein the time required for assembly process of a printed board is shortened and costs for parts and manufacture are reduced, without requiring a test pin or special short jig in an adjustment/inspection process for a printed substrate generally used for electric apparatus. SOLUTION: First and second test points 103 are formed on a part insert surface of a printed board 101, with the first and second test points 103 provided, adjoining each other, with a specified distance. At the first and second test points 103, first and second jumper lines 104 are so allocated as to extend in parallel each other, respectively. By short-circuiting between the adjoining first and second jumper lines 104 with a tip of a blade driver 105, etc., the printed board 101 is adjusted/inspected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board generally used for electrical products and has test points used in processes such as adjustment and inspection.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional printed circuit board having test points has first and second test points 503 formed on its component insertion surface.
The second test point 503 is arranged at an arbitrary position on the printed circuit board. The first and second
Each test point 503 has a test pin 508
Are inserted from the component insertion surface and soldered and fixed on the soldering surface on the back side.

FIG. 4 is a circuit diagram of an X-ray protector circuit as an example of a circuit to be adjusted and inspected, which is configured using a printed board having test points. This circuit is used when the high voltage applied to the CRT of the television receiver rises abnormally due to an abnormality in peripheral circuits or the like.
This is to prevent X-rays exceeding a specified amount from being emitted from the RT.

First, an outline of the operation of this circuit example will be described. In FIG. 4, a pulse having a horizontal period proportional to the high voltage is output from a flyback transformer T1, and the pulse is rectified by a diode D1 and a capacitor C1 through a resistor R1 to become a DC voltage V1, and further a resistor R2, The voltage V2 divided by the resistor R3 is applied to the Zener diode ZD1.

In a normal state, the voltage V2 is set lower than the Zener voltage of the Zener diode ZD1, and no voltage is applied to the horizontal oscillation switch 413. However, when the high voltage applied to the CRT increases due to an abnormality in a peripheral circuit or the like,
The voltages V1 and V2 also increase in proportion thereto, and when the voltage V2 exceeds the Zener voltage of the Zener diode ZD1,
A voltage is applied to the horizontal oscillation switch 413, and the horizontal oscillation circuit 414 stops.

As a result, the horizontal output circuit 415 and the flyback transformer T1 also stop operating, and X-ray emission from the CRT 412 can be prevented.

Next, a conventional method for adjusting and inspecting a printed circuit board having test points will be described. In a conventional adjustment / inspection method for a printed circuit board having test points, as shown in FIG. 5, a short circuit is made between the first and second test pins 508 using a short jig 509 composed of a crocodile clip and a wire. .

The test pin 508 corresponds to the test points 410 and 411 in the circuit example of FIG. 4. When the test pin 508 is short-circuited, the resistor R2 between the test points 410 and 411 is short-circuited and the voltage V of the test point 411 is reduced.
2 rises to the voltage V1, equivalently simulating the same state as the abnormal rise of the high voltage applied to the CRT. Therefore, it can be checked whether or not this X-ray protector circuit operates normally.

As described above, the conventional printed circuit board having test points has been adjusted and inspected by short-circuiting test pins using a short jig.

[0010]

However, the conventional printed circuit board having test points has the following problems.

The first point is that the dedicated short jig is used for adjusting and inspecting the circuit by short-circuiting the first and second test pins arranged at arbitrary locations with a dedicated short jig. Was required.

Second, since test pins which cannot be automatically inserted by an automatic insertion machine are used for test points used for adjustment and inspection, the number of manual insertion steps increases, and it takes time to assemble a printed circuit board. There was a problem that.

Accordingly, an object of the present invention is to eliminate the need for test pins and dedicated short jigs in the adjustment / inspection process, and to reduce the time required for parts and manufacturing in addition to shortening the time in the assembly process of a printed circuit board. An object of the present invention is to provide a printed circuit board having test points to be realized.

[0014]

In order to solve the above-mentioned problems, a printed circuit board having a test point according to the first invention is formed on a component insertion surface adjacent to a distance at which short-circuiting is possible with a tip of a flathead screwdriver or the like. And a first conductive test point and a second test point.

In a printed circuit board having test points according to a second aspect of the present invention, jumper wires are inserted into the first and second test points, respectively, and the jumper wires extend on the component insertion surface in parallel with each other. Characterized by being arranged in

In the printed circuit board having test points according to a third aspect of the present invention, the first and second test points have the leads of a circuit component having leads inserted therein, and the circuit component is disposed on the component insertion surface. It is characterized by being arranged so as to extend in parallel with each other.

A printed circuit board having test points according to a fourth aspect of the present invention is characterized in that eyelets are inserted into the first and second test points, respectively.

[0018]

Embodiments of the present invention will now be described in detail with reference to the drawings. First, a first embodiment of the present invention will be described. FIG.
FIG. 2 is a plan view of a printed circuit board having test points according to the first embodiment of the present invention.

The printed circuit board 101 having test points according to the present embodiment has first and second test points 103 formed on the component insertion surface, and the first and second test points 103 are provided at predetermined positions. They are arranged adjacent to each other at a distance. Here, a jumper wire 104 is inserted into each of the first and second test points 103 from the component insertion surface, and is fixed by soldering on the soldering surface on the back side. The first and second jumper wires 104 are arranged to extend in parallel with each other. The jumper wire 104 corresponds to the wiring between the test point 410 and the first circuit node 416 and the wiring between the test point 411 and the second circuit node 417 in the X-ray protector circuit of FIG. For example,
The distance between the first and second test points 103 is 2.5
mm, the distance between the first and second jumper wires 104 extending in parallel is also 2.5 mm.

Next, an adjustment / inspection method using test points according to the present embodiment will be described. For example, a minus driver 105 is prepared, and a minus driver 1
At the end of 05, the adjacent jumper wires 104 are short-circuited.

When the jumper wire 104 is short-circuited in this way, the resistor R2 between the test points 410 and 411 is short-circuited, and the voltage V2 at the test point 411 is shorted.
Rises to the voltage V1, equivalently simulating the same state as the abnormal rise of the high voltage applied to the CRT,
It can be checked whether this X-ray protector circuit operates normally.

According to the present embodiment, the test pins 508 shown in FIG. 5 become unnecessary compared with the conventional test pins in which adjustment and inspection are performed by shorting the test pins with a short jig. Can be reduced. Further, the dedicated short jig 509 shown in FIG. 5 can be eliminated. In addition, automatic insertion of parts becomes possible,
It is possible to reduce the number of manual insertion steps and the time required for assembling the printed circuit board.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a plan view of a printed circuit board having test points according to the second embodiment.

The printed circuit board 201 having test points according to the present embodiment has first and second test points 203 formed on the component insertion surface, and the first and second test points 203 are provided at predetermined positions. They are arranged adjacent to each other at a distance. Here, the leads of the circuit components 206-1 and 206-2 having leads are inserted into the first and second test points 203, respectively, and are fixed by soldering on the soldering surface on the back side. . The first and second circuit components 206-1 and 206-2 are arranged so as to extend in parallel with each other.

The test point 203 in the plan view of FIG.
Is the test point 41 of the X-ray protector circuit in FIG.
0 and 411. In FIG. 2, the circuit component 2 is placed between the test point 410 and the first circuit node 416 of FIG.
06-1 is a form in which the circuit component 206-2 is inserted between the test point 411 and the second circuit node 417 in FIG. As an example of a circuit component having a lead, it is shown here using a resistor.

In this embodiment, the test point 203
When the two are short-circuited by the tip of a flathead screwdriver or the like, the first circuit node 416 and the second circuit node 41 in FIG.
7 is electrically connected, and it can be checked whether the X-ray protector circuit operates normally.

According to the printed circuit board 201 having the test points 203 of the present embodiment, in addition to the effects of the first embodiment, the jumper can be achieved by using the circuit components constituting the X-ray protector circuit. A special wire such as a wire is not required, and the parts cost can be further reduced.

Further, according to the second embodiment, the circuit component 206-1 between the test point 410 and the first circuit node 416 as shown in FIG. By freely setting the constant of the circuit component 206-2 between the circuit node 417 and the circuit node 417, it is possible to set and inspect at a desired level whether or not the X-ray protector circuit operates normally. 4, the degree of freedom in circuit design of the X-ray protector circuit can be increased.

Although the second embodiment has been described above, the first and second circuit components 206-1, 206-
2 is connected to the jumper wire 1 as in the first embodiment.
04 can also be substituted. By doing so, the degree of freedom in circuit design for testing the X-ray protector circuit can be further improved.

Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a plan view of a printed circuit board having test points according to the third embodiment.

The printed circuit board 301 having test points according to the present embodiment has first and second test points 303 formed on the component insertion surface, and the first and second test points 303 are provided at predetermined positions. They are arranged adjacent to each other at a distance. Here, eyelets 307 are inserted into the first and second test points 303, respectively, and are fixed by soldering on the soldering surface on the back side.

According to the printed circuit board 301 having the test points 303 according to the present embodiment, the area occupied by the components can be reduced separately from the effects of the first and second embodiments. Parts arrangement on the printed circuit board is facilitated.

[0033]

As described above, according to the printed circuit board having the test points of the present invention, as the first point, a circuit component having jumpers or leads at test points used for adjustment and inspection, or an eyelet is provided. The use of the test pins eliminates the need for test pins conventionally used as test points, and has the effect of reducing component costs.

As a second point, a circuit component having first and second jumper wires or leads arranged adjacent to each other,
Alternatively, since adjustment and inspection of the circuit can be performed by short-circuiting between the eyelets with the tip of a flathead screwdriver or the like, a dedicated short jig is not required, and the manufacturing cost can be reduced.

Third, by using a jumper wire or a circuit component having a lead or an eyelet which can be automatically inserted by an automatic insertion machine into a test point used for adjustment and inspection, the number of manual insertion steps can be reduced. This has the effect of reducing the assembly time of the printed circuit board.

[Brief description of the drawings]

FIG. 1 is a plan view for explaining test points according to a first embodiment of the present invention.

FIG. 2 is a plan view of a printed circuit board having test points according to a second embodiment of the present invention.

FIG. 3 is a plan view of a printed circuit board having test points according to a third embodiment of the present invention.

FIG. 4 is a circuit diagram of an X-ray protector circuit as an example of a circuit to be adjusted and inspected according to the present invention.

FIG. 5 is a perspective view of a conventional printed circuit board having test points.

[Explanation of symbols]

101, 201, 301, 501 Printed circuit board 102, 202, 302 Component insertion hole 103, 203, 303, 503, 410, 411 Test point 104 Jumper wire 105 Slotted driver 206-1, 206-2 Circuit component having a lead (resistance 307 Eyelet 508 Test pin 509 Short jig 412 CRT 413 ON / OFF switch of horizontal oscillation circuit 414 Horizontal oscillation circuit 415 Horizontal output circuit 416 First circuit node 417 Second circuit node V1 Voltage of test point 410 V2 test Voltage at point 411

Claims (4)

[Claims] 1. A printed circuit board having test points, wherein first and second test points adjacent to each other are formed on a component insertion surface. 2. A jumper wire is inserted into each of the first and second test points, and the jumper wires are arranged to extend in parallel with each other on the component insertion surface. A printed circuit board having the test point according to claim 1. 3. The lead of a circuit component having a lead is inserted into each of the first and second test points, and the circuit component is arranged so as to extend in parallel with each other on the component insertion surface. The printed circuit board having a test point according to claim 1, wherein 4. The printed circuit board having test points according to claim 1, wherein an eyelet is inserted into each of the first and second test points.