| November 22, 2011
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Millions are spent every year on the care and handling of circuit assemblies. Nevertheless, to the frustration of everyone involved, handling damage occurs.
Boards, components, and assemblies are dropped, bumped, nicked and dinged with annoying regularity. Not long ago we were presented with a board severely cracked from edge to edge.
One of the mighty international carriers ran over the box containing this board. That's right, ran over, as in with a truck ...
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Microscopes have become essential tools in the rework and repair department. While there have been many applications for other types of manually-operated vision systems, such as illuminated magnifiers and CCTV based systems, the importance of microscopes has been driven by the ever-shrinking size of electronic components, connections, and assemblies, and the spaces between adjacent components.
Microscopes used in this scenario are almost exclusively stereo zoom microscopes, which offer depth perception for the operator and the ability to zoom in for close work. or to zoom out to check the work in relation to the surrounding circuit board topography ...
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Every now and then an error will occur at the most inopportune time; in this case it was in the design phase of the printed circuit board.
When circuit boards are in the prototype phase, it is not uncommon for sockets to be used at BGA sites to prove out functionality. Design Engineers must layout the BGA sites to meet the requirements of the selected test socket.
Many of these sockets rely on a planar site that does not include solder mask covering the connecting circuits and via's. This allows the BGA socket to be uninhibited when mounting onto the board surface while providing direct contact to the BGA pads ...
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Trivia
See the answer below.
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Quote of the Week
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