RE: SMD soldering?

Andre'

Make sure the glue that held down the old IC is removed, you can do this by
over curing it with your soldering Iron. Then prep the pads, use flux and
leave a small amount of solder on the pads. This solder will make the joint
for you.

I then tack down opposites corners of the IC using just enough solder on the
iron to make it conduct. If the IC's pins are not bent most of the other
legs will fall in place. If they don’t, carefully move them over with a
sharp pointed object, I usually use an Explorer (dental tool).

Once you have everything aligned. Soak the pins will a good flux. I still
prefer rosin flux because no clean evaporates too fast. Now, hold the pin
down with the Explorer and touch it with your Iron. If you have enough flux
on the leads you shouldn’t have to worry about bridging the pins. So don’t
be overly concerned about touching more than the leg you want to solder. 

Once everything Is tacked down, clean then reapply flux and re-solder using
the explorer to get that clean finish. Then take the explorer or exactor
knife and carefully run it between the legs of the Ic to make sure there are
no bridges. Observe with a magnifying glass. Clean again and your done. 

Of course make sure you bounce back and forth when soldering, left side of
the chip to the right side, this way you won't overheat the IC. And most
important, your Soldering iron tip temperature should turn to a nice golden
brown after solder is applied. If it turns the flux in the solder black then
you are way to hot. 

Anyway, all steps are important. But To answer your question, I normally
just tack down the corners first. 

-----Original Message-----
From: owner-cbm-hackers@musoftware.de
[mailto:owner-cbm-hackers@musoftware.de] On Behalf Of "André Fachat"
Sent: Sunday, November 01, 2009 06:31
To: cbm-hackers@musoftware.de
Subject: SMD soldering?


Hi,

I know some of you do SMD soldering. I did already solder 1.27mm distance
packages, but now I have to solder some 1.0 or .8mm pins - and I find it
quite difficult to position the SMD part correctly. I only have normal
pincers as help. I solder one pin and by resoldering that pin I can actually
correct the position before soldering the other pins - but that seems
difficult with those smaller parts.

What do you use to position those SMDs? Do you have vacuum pincers /
airpicks (or whatever they are called)? Or do you use other tools? Like glue
to keep the part in position when positioned? 

Any help appreciated

Thanks
André

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