The use of a building hair dryer in the repair of electronic equipment. Scheme, description

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Using a hair dryer when repairing electronic equipment. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies

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The article describes the original author's method of soldering a surface mount processor.

We open the device for repair, there is no circuit, we find a broken zener diode and, in the best traditions of pathfinders, we begin to crawl along the path, trying to find the source of the malfunction. The track crawls up to the surface-mount processor with legs on four sides and is safely lost under its bowels.

This is a real situation in which you can sit down and think about whether it is worth soldering this cockroach for the sake of your curiosity.

Of course, you can resolder with a simple soldering iron, hooking your legs with a needle, pulling a thread, and the like, but in order to leave a decent view of the installation, you need accuracy, and most importantly, a lot of time. Having in your arsenal a simple tool called a building hair dryer, this operation can be reduced to a couple of minutes, and the fact that the microcircuit was soldered and put in place can only be determined by the fresher type of tin under the feet of the microcircuit, in a couple of months the replacement will not be determined by any one expert, because the soldering will be purely factory.

Try two times to determine which of the microcircuits was removed and put in place:

The use of a building hair dryer in the repair of electronic equipment

That's right, left. Shinier tin, the chip is rotated 90 degrees and the key is facing the 64th leg. It took one minute to remove it, another minute to put it back in place.

Although, in principle, the replacement for such a time is not correct, following the rules, you must follow the thermal profile and spend at least 5 minutes on a gradual warm-up, but I personally do not have the patience for these rules. So far, this has not led to sad consequences, all the replaced parts have worked.

As a flux, ordinary rosin is used, tin is enough for what remains on the tracks. Flux residues after soldering are washed off with alcohol using a brush, you don’t need to leave dirt behind, it’s not aesthetically pleasing, harmful to solders, and so that you would not be considered a freak during subsequent repairs.

And now about the hair dryer itself, which one to choose. And anyone who has 300 degrees of hot air at the outlet of the nozzle, that is, just not for women. Ruffles for a smooth change in temperature, various air flow rates, this is already at the request of the buyer, it is more convenient to use, but convenience is not critical. The only thing you need to take care of is the purchase, or the independent manufacture of adapters from tin that has turned up under the arm for a smaller nozzle diameter, it is not at all necessary to heat the floor of the board in order to remove the smd memory for 8 legs.

Before soldering anything on a working device, you need to practice on an unnecessary one; old computer boards are ideal for this. It is necessary to choose the distance for a particular hair dryer from which to blow so that the board does not burn.

In principle, you can also purchase a hot air soldering station, although it will be more expensive, it will be more convenient to use, but at the same time versatility is lost, because a hair dryer can also be used for its direct construction purpose. Again, the device that came after the next cat and the board washed by the fairies in the bath can be turned on after half an hour of drying with this device. Fast and convenient.

Author: Evmenenko Yu.; Publication: cxem.net

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