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To elaborate on the soldering advice given above:
When you have sucked off the old solder, examine the area carefully. All the metal should be tinned. If there are any oxidised areas, gently scrape these down to bare metal with a scalpel or craft knife before re-soldering.
A temperature-controlled soldering iron is best for delicate work. If you don't have one of these, use extra care to ensure that you do not overheat the joint whilst re-soldering. When heating up the joint before applying the solder, ensure that there is a face on the bit in contact with both of the surfaces to be soldered. The keys to success are:
1. Get the joint up to temperature quickly
2. Apply the solder quickly
3. Get out quickly
4. If there are a lot of joints, allow some time for each to cool before moving on to the next one
When solder is allowed to sit on the bit for some time, the tin boils out and a faulty 'dry' joint may be produced (they generally look 'frosty'). Therefore, wipe the bit clean just before making the joint.
If you haven't done this before, practice on an old printed circuit board. There's plenty of that 'techno-junk' lying around!
Andrew
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