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Apply the heat

Time to apply the heat and solder the components. Unfortunately, we couldn’t photograph this part, as it happens inside a closed environment. There’s a quick visual check at this point to ensure that everything is okay.
What’s been heated has to be cooled, right? So, the board is now washed, using jets of water that also cleans away extra solder, unsoldered components, and other loose particles, if any.
Still to come are the even larger components that have to be placed by hand and wave soldered.

The washing machine

Real
biggies come now

The bigger components
and those made of plastic are mounted now. It’s done manually on an
assembly line type of table. Components that go in now include the
slot raisers, ports, AMR (Audio Modem Raiser), and power connectors.

Wave
soldering

The
board is then wave soldered. It moves up an incline, with molten
solder flowing down in the opposite direction. The level of solder is
controlled, so that it doesn’t spill on the upper surface of the
board, and at the same time, doesn’t miss out any part of the lower
surface.

The motherboard is now complete.

Testing
times

The
board is done. But is it ready? The last part of the process is
testing and quality checks. Each board is put to test. If the board
passes the tests, it’s stamped, packed in anti-static bags, and made
ready for shipping. If it fails, it’s passed on to a second group of
testers, who try and salvage the board, correct errors, and then send
it back to the first group for re-testing.