Reworking SMDs
IMPORTANT factors involved when working with the ATMOSCOPE SMT Hot Air Tool
1.
Amount of air output.
2.
Temperature setting.
3.
Type of tip used.
1.
Have the proper Tip installed.
2.
Adjust air output to about 2-4 scfh.
3.
Set temperature between 700°F to 800°F.
4.
Heat up the joints until the solder melts.
5.
Remove by using a pair of tweezers.
6.
To resolder, hold SMD in place making sure
leads are aligned with solder pads.
7.
Direct hot air flow to the connection until solder
reflows. Release SMD when solder solidifies.
The key to an effective soldering is to reflow the
solder without blowing the solder across the board
and creating bridges.
The following techniques are based on the manufacturer’s point of view and
Should only serve as guidelines. Its effectiveness will depend on practice.
For Resistors, Capacitors, Transistors, and Alike
1.
Have the proper Tip installed.
2.
Adjust air output to about 2-4 scfh.
3.
Set temperature to 700°F.
4.
Using a
WS630
SMD Pull Wire, thread the pullwire
under the leads of one side of the SMD and again thread
the wire under the leads of the opposite side.
5.
Anchor one end of the Pull Wire to an unused hole of
the circuit board or maybe tape it securely to the board.
6.
While directing hot air to the leads of the first side, pull
the wire so that it will cut through the solder connection.
7.
After removing the two opposing sides, follow the same
procedure to desolder the remaining sides.
8.
To resolder, use a tweezer to hold SMD in place and
align the leads with the pads.
9.
Use a Fan Tip whose width is as close to the size of
the SMD leads as possible
10.
Direct hot air on the leads and allow solder to reflow.
Release SMD when solder solidifies.
For Gullwings, Leadless Chip Carriers, and Quad I.Cs
Method 1
Method 2
ST706
1.
Have the proper Tip installed.
2.
Adjust air output to about 2-4 scfh.
3.
Set temperature between 700°F to 800°F.
4.
Heat up one corner of the SMD.
5.
When the solder melts, insert the shimblade of the
ST706
SMD Helper under the heated area of the chip as if
cutting through the solder connection.
6.
While directing hot air ahead of the shim at all times, cut
through the sides of the SMD and lift up from the board.
7.
To resolder use a Quadra-Flow Tip.
WS630
Fan Tip
DON’T!
Содержание LONER ATMOSCOPE 971HAe
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