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With that number of boards, and unless you want to recover the components
or replace them with something else, I would simply cut them off the board
on the component side and touch up the exposed lead metal with solder
afterwards. If you cut the leads where they're still vertical coming out
of the board, the leads will be easier to remove at some future time,
especially if they're clinched on the solder side.
If you want to remove the components in one piece, you can either use a
mini wave solder rework station to desolder them, or, if the leads are
clinched, I suspect you will have to do it by hand. Get some poor assembler
to sit a long time with a hollow point soldering iron to melt the solder
and unclinch the leads before removing the component in the usual fashion
by fluxing, desoldering and extracting the solder with wicks or vacuum
solder extractors to free the cap.
A skilled operator should be able to remove these things quite quickly (a
few seconds only per lead), but try not to expose the board to too much
thermal mucking about as you can lift lands and damage tracks. Make sure
the capacitor legs are free to move in their holes after solder extraction
before you try to pull the component out of the board or you'll pull the
plating barrel out of the hole with the component and lose any inter-layer
connections you might have had. Then you'll be faced with having to hard
wire the damaged section of the net.
Good luck,
Pete Duncan
John Fahey
<jfahey@ECHEL To: [log in to unmask]
ON.COM> cc: (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
Sent by: Subject: [TN] T/H Capacitor Removal- IPC standards?
TechNet
<[log in to unmask]
ORG>
08/21/01
01:16 AM
Please
respond to
"TechNet
E-Mail
Forum."
Good Morning.
As part of a design mod, I have been requested to remove 2 Through Hole
resistors from one of our assemblies. There are @2000 boards.
What is the recommended process for removing Through Hole capacitors. Is
there any IPC guidelines?
I would like to just clip the leads on the top and bottom of the board for
an easy rework. This will leave part of the leads soldered in the holes,
but I am not aware of any issue with this apart from the fact it may not
look pretty!
Any advice would be much appreciated.
Thanks again,
John
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