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Air Checking Fixture For Soldered PC Boards

IP.com Disclosure Number: IPCOM000051540D
Original Publication Date: 1981-Feb-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Bernardo, ET: AUTHOR [+3]

Abstract

The present fixture eliminates the shipping of printed circuit boards with unsoldered pins and decreases the inspection time. The soldered pin is inspected for solder and for solder joints slip through.

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Air Checking Fixture For Soldered PC Boards

The present fixture eliminates the shipping of printed circuit boards with unsoldered pins and decreases the inspection time. The soldered pin is inspected for solder and for solder joints slip through.

The fixture is designed to locate the soldered printed circuit board over an open chamber or cavity large enough to contain the complete pin area. The board is then clamped in place, and the bottom edges of the board sealed around the open chamber. Air can now be pumped into the chamber. A pressure gage connected to the chamber monitors the PSI in the chamber, and when the desired pressure is reached, the air is turned off. Then, the pressure gage is monitored for any drop in pressure. A drop in pressure indicates an unsoldered pin. The board can be separated for rework. A light table is used to monitor the printed circuit boards for open vias. When open vias are found, they are repaired before air-check inspection.

The fixture can also be used with smoke and air in the chamber as a detector. With de-ionized water on top of the board and air in the chamber, the water will bubble where defective solder joints exist.

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