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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.
English (United States)
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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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