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Asynchronous Compliant for Personal Computer Testing

IP.com Disclosure Number: IPCOM000061113D
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 3 page(s) / 62K

Publishing Venue

IBM

Related People

Baughman, R: AUTHOR [+3]

Abstract

This article describes a mechanism which provides reliable alignment and connection of the asynchronous (async) compliant on the tester to the async card in a personal computer (PC) during an automatic test cycle. In systems testing of PCs, it is necessary to provide reliable connection from the async compliant located in the test fixture to the PC under test. The mechanism disclosed herein solves alignment problems encountered during the automatic test cycle of the async card on the PC product. In testing, the PC arrives at a test station via a plastic pallet carrier. A test head assembly is activated and moves forward to make connection with the back of the personal computer chassis. Several compliants of different types are sequentially activated to provide specific test functions.

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Asynchronous Compliant for Personal Computer Testing

This article describes a mechanism which provides reliable alignment and connection of the asynchronous (async) compliant on the tester to the async card in a personal computer (PC) during an automatic test cycle. In systems testing of PCs, it is necessary to provide reliable connection from the async compliant located in the test fixture to the PC under test. The mechanism disclosed herein solves alignment problems encountered during the automatic test cycle of the async card on the PC product. In testing, the PC arrives at a test station via a plastic pallet carrier. A test head assembly is activated and moves forward to make connection with the back of the personal computer chassis. Several compliants of different types are sequentially activated to provide specific test functions. Since product dimensions and positional repeatability vary considerably, it is extremely important that the async compliant can self-align at least one hundred thousandths of an inch, to locate both connectors on the same plane, insuring the mating of the electrical contact pins regardless of the product variations. The mechanism of this disclosure is shown in the perspective view of the drawing. Electrical contact block A has 25 pins and mates with a 25-pin connector on the async card located on the PC. Connector guide B is designed to locate the electrical contact block A in perfect alignment with the async card 25-pin connector. Housing 25-pin guide C supports the electrical contact block A. Alignment pin D is located in the center of the connector guide half round holes and provides the additional final alignment before the electrical contact pins mate. After connector guide B locates, the release springs E compress, allowing the electrical contact block A to move forward and mate with the async card connector. The tendons F are key in maintaining parallelism between the mounting plate I and the mounting plate connector H when a shift is required in any of the three axes. After a shift has occurred and the compliant is retracted, the tendon springs G return the mounting plate connector H to the original natural state position. They also are used to maintain parallelism when mounting plate H shifts as required by the connector guide B. The mounting plate connector H floats into any position the connector guide B demands for alignment. Mounting plate I rigidly fastens to the pneumatic cylinder drive shaft M with guide rods J for forward and return motion in the Z axis direction. The guide rods J support the compliant and guide the Z axis movement. Mounting bracket K fastens to the front test head assembly. Ball bushings L decrease friction on the guide rods. Pneumatic cylinder drive shaft M pr...