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Using a Hot Air Rework Station for Surface Mount Soldering
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Today's video is about surface mount soldering using a hot air rework station.
00:00:05
The model I'm using is the 852A Plus from AOU, however you pronounce that.
00:00:10
This is a common model available worldwide.
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We're going to solder the components used in our own LCD backpack.
00:00:19
There is a 20-pin microcontroller, a MOSFET transistor, and a variable resistor, all surface
00:00:22
mount components.
00:00:28
We will also be using a laser cut stencil for adding the solder paste to the circuit
00:00:30
board.
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The stencil is 0.1mm thick, which may not seem thick enough to apply sufficient solder
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paste, but it is.
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So let's get rid of the components for now and we'll apply our solder paste.
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Line up the stencil holes with the component pads and add a blob of solder paste, either
00:00:53
from a syringe or from a little tub.
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The perfect tool for spreading the paste is a craft knife blade.
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Once your stencil is lined up correctly, hold it down to stop it moving and spread the paste
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with the blade.
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Lift off the stencil and check that the paste has transferred to the pads correctly.
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Any problems, just wipe it off and start again.
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We can clean up the stencil with the blade, scrape off the unused solder paste and then
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wipe with a cloth.
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Now we can add the components to our board.
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A pair of SMD tweezers is useful here.
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Drop the chip onto the solder paste.
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Make sure the pads are aligned and give it a gentle press.
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the solder paste will hold it in position. Now we add the transistor. Drop it into place
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and a little press will hold it. Don't worry if it is not perfectly aligned. When the solder
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paste heats up it will be pulled into position. Add the last component and we are ready for
00:02:55
the hot air station. I use a heat proof mat for the board to sit on. The hot air is coming
00:03:06
out at 350 degrees centigrade so don't do it on anything that will burn. The hot air
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rework station is easy to use. Turn on the power and then turn on the hot air. Set the
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required temperature, we use 350 degrees. The air flow can be left to the default. It
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only takes a few seconds to heat up. Use the hot air gun about a centimetre from the board
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and for transistors like this, move the gun in a circular motion. The solder paste soon
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melts and the transistor is pulled into the correct alignment. For the chip, go up and
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down each row of the pins. It will be obvious when the paste has melted. Give the chip a
00:04:10
little press to seat it firmly in the solder. Again, a circular motion is used for the variable
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resistor.
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And that's it. Check the board under a magnifying glass and rework any joints if you need to.
00:04:44
- Subido por:
- Antonio S.
- Licencia:
- Reconocimiento - No comercial - Compartir igual
- Visualizaciones:
- 73
- Fecha:
- 10 de diciembre de 2018 - 18:22
- Visibilidad:
- Público
- Centro:
- IES ANTONIO MACHADO
- Duración:
- 05′ 07″
- Relación de aspecto:
- 1.46:1
- Resolución:
- 524x360 píxeles
- Tamaño:
- 16.79 MBytes