9 May
2011
9 May
'11
7 p.m.
Also, once you have most of the solder removed from
the feed through
hole then you can push on the leg of the device with a small screwdriver
Sometimes fine-nosed pliers are a more suitable tool.
(or the like) to try to release it from the side of
the hole. Most
device legs go in the hole on an angle, thus there is a tiny film of
solder holding the leg to the side of the hole - sometimes on both the
top and the bottom of the hole. You will feel or hear a tiny 'click' as
the leg releases.
Looks like this (somewhat crappy ASCII sketch)
\
|\ | <--- Top of feed through hole
| \ |
| \ |
| \| <--- Bottom of feed through hole
\ <--- Leg of device
So you are trying to break the top and bottom points by pushing the leg
away from the side of the hole it is soldered to.
This works well fro removing DIP ICs and the like. After using the solder
sucker and freeing the pins on the sodler side, you then put a small
screwdriver blade on the component side of the board so that it presses
on the ICB pin close rioght on the PCB. Then push the pin inwards,
towards the body of the IC. As you said, you'll feel it 'give. After
freeing all the pins, the IC should lift out with no problems.
Another tirck which I hesitate to metnion for components with pins in a
line, like SIL resisotr packs is, after desoldering nad freeing the pins
as a bove, if it still won't come free, rock it carefully at right angles
ot the line of pins. You can then see whick pinsare moving (and are thus
free, and which need to be resoldered and desoldered again to free them.
If done correctly the device will then be easy to
remove with only
finger force - no prying with the screwdriver!
IMHO much of the skill in removing components is to know how much force
you can apply without damaging either the PCB or the component. You can
try carefully prising it up with a screwdriver, but if it doesn't come
easily, don't apply more force or you will either crack the component or
rip traces off the PCB. Stop and find out what's holding it..
-tony