JPS6322480B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for testing a printed board mounted on a shelf by operating it while mounted on the shelf.

Figure 1 is a sectional view showing the printed board mounted on the shelf, where 1 is the printed board, 2 is the back panel, 3 is the shelf (shelf's guide rail), and 4 is the terminal pin implanted in the back panel. 11 is a printed board connector which includes a female contact which is fitted with the pin 4 as a male contact.

Conventionally, when such an electronic device is operated to probe any point on each printed board 1 and observe the voltage value and waveform, the procedure is as shown in FIG. That is, by connecting a so-called extension card 5 to the back panel 2 instead of the printed board 1 to be tested, and connecting the printed board 1 to the connector 52 at the end thereof, the printed board to be tested was pulled out to the outside of the shelf. The entire device is operated in this state, and the printed circuit board to be tested is tested. However, in this conventional method, a delay occurs due to the wiring length l between the connectors 51 and 52 in the extension card 5, and a problem arises in that sufficient testing cannot be performed in today's high-speed operating devices. .

Therefore, in the present invention, the terminal pins 4 that are generally installed in the back panel 2 are formed approximately symmetrically on the front and back (the pins on the back side are used for wrapping discrete wiring, but the This paper focuses on the fact that the amount of discrete wiring is becoming extremely small as the technology advances, and proposes to mount the printed circuit board under test on the back of the back panel.

However, the connector 11 generally has multiple rows of contacts, and if it were simply inserted into the back of the back panel, the rows of contacts would be reversed left and right. Therefore, it is necessary to connect via the adapter connector 6 as shown in FIG. 3a. As shown in FIG. 3b, this adapter 6 is internally wired so that the female contacts 61 on the back panel side and the male contacts 62 on the printed board to be tested are left and right reversed.

In the above example, it is assumed that the terminals implanted in the back panel 2 are pin-shaped terminals penetrating the front and back sides, but it goes without saying that other terminals may be used.

As described above, according to the present invention, it is possible to carry out a mounting test by pulling out a desired printed board to be tested outside the shelf without adding much wiring length, and sufficient testing can be performed even with a high-speed device.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a general shelf; FIG. 2 is a sectional view showing a conventional test method using an extension card; FIG. Figure b is a sectional view of the adapter. In the figure, 1 is a printed board, 2 is a back panel, and 6 is an adapter.

Claims (1)

[Scope of Claims] 1. In a method for testing a printed board in an electronic device in which a plurality of printed boards are mounted on one side of a back panel in which terminals are arranged substantially symmetrically, the printed board to be tested is mounted on one side of the back panel. A printed circuit board testing method characterized by conducting a test by connecting to the back side of the board via an adapter connector with interchanged terminal arrangement.