Browse Prior Art Database

Automatic Substitution Tester for Circuit Boards

IP.com Disclosure Number: IPCOM000052261D
Original Publication Date: 1981-May-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Greenwood, ER: AUTHOR

Abstract

This test arrangement uses one known good circuit board for checking each component of production circuit boards with the only limiting requirements being that the boards be designed with test viaducts at the interconnections between components, modules or sections and that each section be capable of electric isolation by means of a control line.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 77% of the total text.

Page 1 of 2

Automatic Substitution Tester for Circuit Boards

This test arrangement uses one known good circuit board for checking each component of production circuit boards with the only limiting requirements being that the boards be designed with test viaducts at the interconnections between components, modules or sections and that each section be capable of electric isolation by means of a control line.

The known good circuit board 10 is modified to incorporate probes 12, 14, 16, 18 ... affixed to interconnecting leads between components 1, 2, 3, 4, 5 ..., as shown. It is essential that the circuit boards to be tested have room for affixing the probes on the tester board and room for pads to which the probes connect to the product circuit boards to be tested. The probes are spring-loaded so that a circuit board 20 under test is positioned over the tester boards, and the component subcircuits on the two boards are effectively connected in parallel.

The known good circuit board 10 is a part of the test circuitry which is arranged for processor control for running all of the tests necessary to check a given circuit board. In operation, the test circuitry is under control for effectively disconnecting one component, module or section from the test circuit and substituting the corresponding component, module or section of the product circuit board to be tested. The necessary signal and control lines are activated, as required, to substitute one section of the product circuit b...