Precautions
2-2-4 Diodes and Tr.-- Removing the Part
1) Using special desoldering iron:
-- Kind of the Part1Selet the tip according to the size and shape of the IC.
The kind of the part is as follows:2OTin� the tip with a small amount of the IC leads.
1) Chip VRs.3Set the tip squarely over the IC leads.
2) Chip Trimmer Capacitors4When the solder melts, carefully twist the iron.
5
3) DiodeRaise and remove the IC.
4) Transistors
2) Using shaped airblower unit:
-- Removing the Part1Select the correct nozzle.
1) Using two soldering irons:2Select the temperature and airblow(suggested:
1Use small flat-blade tips.temperature:7, airblow:4)
2Heat the leads of the part simultaneously.3Engage the IC removing tool.
3When the solder melts, grasp and remove the part4Use the airblow to preheat the IC for about 5
with the soldering iron tips.seconds, then heat with the nozzle until the IC
4Remove the old solder with desoldering wire.remover lifts the part from the board.
Fig 2-3IC
-- Installing the Part
1) Clean the area where the new part is to be mounted.Fig 2-4
2) Apply flux.
-- Installing the Part
3) Set part correctly into position, prevent it from shifting.
1) Use desoldering wire to remove the previous solder.
4) Use sharp soldering iron tip. Bring close to the
2) Clean the location.
part contact without actually touching it. Melt thin
3) Apply flux.
solder between the tip and part si that it flows into
4) Position the IC and solder two pins at opposite sides.
the part contact.
5) Use a sharp tipped soldering iron and carefully sol
der each Pin.(After gaining experience, a thicker tip
2-2-5 Chip ICs
can be used for better work efficiency.)
-- The kind of the Chip ICs6) Remove any solder bridges with desoldering wire.
The kind of the chip ICs are as follows:7) Inspect the work with a magnifier.
1) SOP(Small Outline Package)IC
2) SSOP(Shrink Small Outline Package)IC
3) VSOP(Very Small Outline Package)IC
4) QFP(Quad Flat Package)IC
5) VQFP(Very Quad Flat Package)IC
6) PLCC(Plastic Leaded Chip Carrier)IC
7) TSOP(Thin Small Outline Package)IC
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