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After a board is fully soldered it will usually be tested either by a robot called a Mens Im Classic 1929 92nd Birthday For 92 Years Old shirt probe machine, which as the name suggests moves extremely quickly to stick a couple electrical probes on different spots on the circuit boards to run a few dozen tests per board. The other way they’re tested is with a device called a bed of nails tester, a carefully special made jig for each board design that makes contact with many test points at once with little spring loaded pins, called pogo pins. With those testers a worker can place a board on the tester and almost immediately see a red or green light to pass or fail and sort the boards, and test thousands per day.
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There are all kinds of ways this process can go wrong, and it’s pretty often that a part Mens Im Classic 1929 92nd Birthday For 92 Years Old shirt knocked askew a little or a pad gets just slightly less than enough solder. For very cheap designs those failed boards might be sent to a recycler to recover the chips, or worse just the raw metals, but for higher margin products and more expensive chips most manufactures will have an army of hot air reflow specialists, very skilled employees who will use microscopes, tweezers and vacuum tweezers, and expensive very precise hot air soldering tools to gently move parts back where they should go, add or remove solder, and replace faulty components. Again one of those extremely skilled workers might fix hundreds or thousands of boards in a day.All of this is so standardized that there are at least hundreds of companies offering the manufacture and assembly of printed circuit boards as a generic service, called PCBA (Printed Circuit Board production and Assembly). You can design a board on your computer right now if you want and upload it to such a service and have it in your hands tomorrow if you want. A single simple custom board made with a long lead time and cheap components could be done for only $10 or $20, and of course there are steep volume discounts.