| March 25, 2009
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Oops! Somebody goofed. Happens all the time. A routing miscommunication resulted in a significant problem for a customer. The circuit traces for 2 connectors were supposed to route to 2 adjoining connectors and vice versa.
If the circuit board connectors were not rewired and the mating daughter board was plugged in sparks would fly! Do to time considerations re-manufacture was not viable ...
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Drilling boards in the post-production environment is tricky work. Certainly if the circuit board is populated with components and other hardware, the setup alone can be time consuming.
Things get dicey when the drilling occurs at a location where internal planes project into the newly drilled hole, especially when the planes are separated by 12, 10, 5, or even 2 thousandths ...
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Quite often, a rework department is confronted with the task of cutting, rather than establishing, connections. Often called etch cuts or circuit cuts, such procedures involve breaking connections both on the surface of the circuit board as well as internally.
Severing inner layer circuitry is more complicated. In this instance, the exact location of the inner layer must be determined, sometimes with bright backlighting, but, more often (with thicker boards), through x-ray ...
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Trivia
See the answer below.
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Quote of the Week
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