IPC 7711A.pdf - 第116页
NOTES IPC-771 1A Number: 3.7.7 Revision: Date: 2/98 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 re…
EQUIPMENT REQUIRED
Hot gas (air) reflow system
Nozzle
MATERIALS
Cleaner
Flux
PROCEDURE
1. Remove conformal coating (if any) and clean work area of any contamination,
oxides or residues.
2. Install nozzle into the hot gas reflow system and raise nozzle to highest position.
Place PWB assembly onto the work platform.
3. Set system controls to the required settings to optimize performance.
4. Apply flux to component leads. (See Figure 1.)
5. Position component to be removed under nozzle. (See Figure 2.)
6. Lower nozzle and check alignment and make adjustments as needed. (See Fig-
ure 3.)
7. Position nozzle to expose vacuum cup. Turn on vacuum and lower vacuum cup
until it touches component.
8. Lower nozzle to component and commence reflow cycle and observe solder melt
of all leads. (See Figure 4.)
9. Upon completion of the reflow cycle, raise nozzle and allow component to cool
prior to board removal from work platform. (See Figure 5.)
Figure 1 Flux Component
Figure 2 Position Component
Figure 3 Lower Nozzle
Figure 4 Melt All Joints
Figure 5 Lift Component
7711A
Rework of
Electronic Assemblies
Revision:
Date: 2/98
Gull Wing Removal (four-sided)
Hot Gas (Air) Reflow Method
Number: 3.7.7
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: 3.7.7
Revision:
Date: 2/98
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
Board surface tip
Soldering handpiece
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.
3. Start with tip temperature of approximately 315°C and change as necessary.
4. Using soldering handpiece, melt solder to form a solder bridge fill joining all
component leads. (See Figure 1.)
5. Remove old solder from tips and thermal shock tips with damp sponge.
6. Tin inside edges of tips with solder. (See Figure 2.)
7. Lower tips over component and squeeze handpiece. (See Figures3&4.)
8. Contact ALL leads with tips, confirm solder melt of ALL joints and lift compo-
nent from PWB. (See Figures4&5.)
9. Release component onto a heat resistant surface.
10. Re-tin tips with solder.
11. Prepare lands for component replacement.
Figure 1 Bridge
Figure 2 Tin Tips
Figure 3 Position Tips
Figure 4 Melt Joints
Figure 5 Lift Component
7711A
Rework of
Electronic Assemblies
Revision:
Date: 2/98
J-Lead Removal (four sided)
Bridge Fill Method - Tweezer
Number: 3.8.1
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
--``,``,-`-`,,`,,`,`,,`---