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Simplified Pin Test Fixture

IP.com Disclosure Number: IPCOM000085008D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Cadwallader, RH: AUTHOR [+4]

Abstract

This arrangement provides a method for monitoring substrate assemblies for missing pins. The circuit module is mounted face down, that is to say, with the connection pins facing up, in a suitable holding fixture. A head assembly 1 containing an array of relatively large diameter floating pins 3 is lowered over the module. Pins 3 are arranged to contact the ends of the module pins such as 5 in Fig. 1.

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Simplified Pin Test Fixture

This arrangement provides a method for monitoring substrate assemblies for missing pins. The circuit module is mounted face down, that is to say, with the connection pins facing up, in a suitable holding fixture. A head assembly 1 containing an array of relatively large diameter floating pins 3 is lowered over the module.

Pins 3 are arranged to contact the ends of the module pins such as 5 in Fig. 1.

Further depression of the head assembly 1 will then cause the module pins 5 to push the floating pins 3 upwardly. The pins contact a diaphragm 6, pushing it up to seal openings in an elastomer layer 7, having holes 9 therein which communicate with a manifold opening 11. Thus the floating pins 3 contacting the ends of the module pins 5 act to compress the diaphragm against layer 7 and close the openings 9 in the floating head assembly.

The system is operated by applying air pressure to space 13. This pressure is distributed through holes 9 into cavity 11 and, in turn, to gauge opening 14 and bleed hole 15. Gauge 17 therefore initially indicates that a certain air pressure is present in space 13 which, as a secondary effect, checks the air system and gauges.

When all module pins 5 are present, all of the leakage ports or openings 9 will be sealed by the heads of the floating pins 3 being pressed against the diaphragm 6 and the elastomer layer 7. Air pressure in cavity 11 will then drain off through bleed hole 15 and the pressure gauges 17 (l...