11 Sep
2011
11 Sep
'11
9:49 a.m.
First trick.
Use a small flat-balse screwdriver on the component side of
the PCB, right against the PCB to force each pin towards the body of the
IC (pushing parallel to the PCB, or as near that as you can). This often
breaks the last bond and lets the thing come out.
I find if you first use the tiny flat screwdriver blade on the solder
side of the board - pushing the leg portion that pokes out in towards
the centre of the IC position, then push the same leg outwards this
frees it up , if not then using the tiny flat blade against the leg
where it enters the solder feed-through hole is the next step as Tony
says.
You will often here a click/pop/snap noise as the leg releases from the
tube.
Yes, and you'll feel the screwdriver 'give' a little. That's a sign
you've got that pin free.
Lastly I take a pair of expanding jaw pliers (for chips up to around 28
pins) grabbing the ends of the IC and rotating it gently on the same
plane as the PCB. This helps free any remaining legs.
Interesting tricke, I;ve never tried that. I will give it a go (on a
scrap PCB first :-))
I then put the pliers down and lift the IC with my fingers.
If you can't lift the IC with your fingers you have not release all the
legs, don't try prying - this only leads to tears and swearing...
I find that uyou can prise (pry) the IC looks after breaking the bond
between each pin and the CPB, but the trick is to know jsut how much
force you can safely apply without damaging either the IC (it is possible
to crack the DIL package and rip pins out) or the PCB. Prising can be
very useful to sdee which part of a large DIL pakacge seems ot be free
wnas whcih pios might still be holding it (and thus need resolderign and
desoldering again). Just take great care!
-tony