smd components

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> From:          Krister Wikstrom <kwi at mamma.icl.fi>
> To:            "'DIY_EFI'" <DIY_EFI at coulomb.eng.ohio-state.edu>
> Subject:       smd components
> Date:          Mon, 22 Jul 1996 10:06:50 +0200
> Reply-to:      diy_efi at coulomb.eng.ohio-state.edu

> Someone asked about manually soldering smd components.
> It should be no problem, if you have very fine tip on your
> soldering iron. 
> I have succesfully (well, I have destroyed some pads...) mounted/removed
> many components, even a 386sx processor with very fine "legs".
> 
> If you wish to remove a faulty chip, just try to cut the pins first and then
> clean up the pads. If you need to remove a chip without destroying it, use a
> thin isolated wire - put the wire under the chip, and then warm up one pin
> at a time simultaneously pulling the wire gently under the pin. This will
> work almost every time on SOIC, but PLCC package is another story.
> 
> To mount a component, put little solder on each pad, then put the chip on top
> and warn each pin at a time to solder. This might require flux to make it
> easier, as the solder will behave much nicer with flux.
> 
> It is very easy to remove smd resistors etc by using two soldering irons, or by
> shortly warming both pads many times.
> 
> I'm working in a computer factory, and our board repair uses special tools
> to remove smd component, but all are manually mounted. This includes special
> chips with 200 pins.
> 
> Oh, and magnifying glass will make it easier...
> 
> 
>   Krister Wikstrom
>   kwi at mamma.icl.fi

thanks alot, that takes the fear factor out of it knowing it CAN be
done.




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