IPC 7711A - 第112页

NOTES IPC-771 1A Number: 3.7.5 Revision: A Date: 10/03 Subject: Gull Wing Removal (four-sided) P a g e2o f2 Copyright Association Connecting Electronics Industries Provided by IHS under license with IPC Not for Resale No…

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EQUIPMENT REQUIRED
Soldering handpiece
Soldering system
Tweezer handpiece
Removal tips
Chisel tip
MATERIALS
Flux-cored solder
Cleaner
PROCEDURE
1. Remove conformal coating (if any) and clean work area of any contamination,
oxides or residues.
2. Install removal tips into tweezer handpiece and chisel tip into soldering hand-
piece.
3. Start with tip temperature of approximately 315°C and change as necessary.
4. Tack solder to one of the corner component leads using the soldering hand-
piece with a chisel tip installed. Wrap solder around the four sides of the com-
ponent. Tack solder at the end of the last side. (See Figure 1.)
5. Remove old solder from tips and thermal shock tips with damp sponge.
6. Tin bottom and inside edges of tips with solder. (See Figure 2.)
7. Lower tips over component and squeeze handpiece, contacting ALL leads with
tips. (See Figures3&4.)
8. Confirm solder melt of ALL joints and lift component from PWB. (See Figures 4
& 5.)
9. Release component onto a heat resistant surface.
10. Re-tin tips with solder.
11. Prepare lands for component replacement.
Figure 1 Tack and Wrap Solder
Figure 2 Tin Tips
Figure 3 Position Tips
Figure 4 Melt All Joints
Figure 5 Lift Component
7711A
Rework of
Electronic Assemblies
Revision: A
Date: 10/03
Gull Wing Removal (four-sided)
Solder Wrap Method – Tweezer
Number: 3.7.5
Product Class: R, F, W, C
Skill Level: Advanced
Level of Conformance: High
Material in this manual, IPC-7711 Rework of Electronic Assemblies, was voluntarily established by Technical Committees of
IPC. This material is advisory only and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the
use, application, or adaptation of this material. Users are also wholly responsible for protecting themselves against all claims
or liabilities for patent infringement. Equipment referenced is for the convenience of the user and does not imply endorsement
by IPC.
Page1of2
Copyright Association Connecting Electronics Industries
Provided by IHS under license with IPC
Not for Resale
No reproduction or networking permitted without license from IHS
--``,``,-`-`,,`,,`,`,,`---
NOTES
IPC-7711A
Number: 3.7.5
Revision: A
Date: 10/03
Subject: Gull Wing Removal (four-sided)
Page2of2
Copyright Association Connecting Electronics Industries
Provided by IHS under license with IPC
Not for Resale
No reproduction or networking permitted without license from IHS
--``,``,-`-`,,`,,`,`,,`---
EQUIPMENT REQUIRED
Soldering system
Tweezer handpiece
Removal tips
MATERIALS
Flux-cored solder
Cleaner
Flux
PROCEDURE
1. Remove conformal coating (if any) and clean work area of any contamination,
oxides or residues.
2. Install removal tips into tweezer handpiece.
3. Start with tip temperature of approximately 315°C and change as necessary.
4. Apply flux to component lead/land areas. (See Figure 1.)
5. Remove old solder from tips and thermal shock tips with damp sponge.
6. Tin bottom edges of tips with solder. (See Figure 2.)
7. Lower tips over component and squeeze handpiece, contacting ALL leads with
tips. (See Figures3&4.)
8. Confirm solder melt of ALL joints and lift component from PWB. (See Figures 4
& 5.)
9. Release component onto a heat resistant surface.
10. Re-tin tips with solder.
11. Prepare lands for component replacement.
Figure 1 Flux Component
Figure 2 Tin Tips
Figure 3 Position Tips
Figure 4 Melt All Joints
Figure 5 Lift Component
7711A
Rework of
Electronic Assemblies
Revision:
Date: 2/98
Gull Wing Removal (four-sided)
Flux Application Method – Tweezer
Number: 3.7.6
Product Class: R, F, W, C
Skill Level: Advanced
Level of Conformance: High
Material in this manual, IPC-7711 Rework of Electronic Assemblies, was voluntarily established by Technical Committees of
IPC. This material is advisory only and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the
use, application, or adaptation of this material. Users are also wholly responsible for protecting themselves against all claims
or liabilities for patent infringement. Equipment referenced is for the convenience of the user and does not imply endorsement
by IPC.
Page1of2
Copyright Association Connecting Electronics Industries
Provided by IHS under license with IPC
Not for Resale
No reproduction or networking permitted without license from IHS
--``,``,-`-`,,`,,`,`,,`---