IPC-7721(S).pdf - 第150页
NOTES IPC-7721 Number: 5.1 Revision: Date: 2/98 Subject: Plated Hole Repair , No Inner Layer Connection P a g e4o f4
EVALUATION
1. Visual examination, dimensional requirement of pad diameter and inside diam-
eter.
2. Electrical continuity measurement.
IPC-7721
Number: 5.1
Revision:
Date: 2/98
Subject: Plated Hole Repair, No Inner Layer Connection
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NOTES
IPC-7721
Number: 5.1
Revision:
Date: 2/98
Subject: Plated Hole Repair, No Inner Layer Connection
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OUTLINE
This procedure covers the use of an eyelet for the repair of a damaged pad on a hole
that has an inner layer connect.
CAUTION
This procedure is used to restore the integrity of a through connection on a multi-
layer PC board, having an inner layer connect, but ONLY if the full barrel of the
plated through hole remains intact. If there is barrel damage see appropriate proce-
dure.
CAUTION
This method will reduce the inside diameter of the hole. The minimum hole size
requirement must be checked for acceptance.
REFERENCES
2.1 Handling Electronic Assemblies
2.2 Cleaning
TOOLS & MATERIALS
Ball Mills, Carbide
Buffer
Caliper
Eyelets
Eyelet Press System
Eyelet Repair Kit
Eyelet Setting Tools
Hand Held Drill
Liquid Flux
Knife
Microscope
Pin Gauges
Solder
Solder Iron
Wipes
EYELET SELECTION CRITERIA
Figure 1 Insert the eyelet into the
hole.
Figure 2 Set the eyelet using an
eyelet press.
Figure 3 Completed repair.
7721
Repair and
Modification of
Printed Boards and
Electronic Assemblies
Revision:
Date: 2/98
Plated Hole Repair,
Double Wall Method
Number: 5.2
Product Class: R, F, W
Skill Level: Advanced
Level of Conformance: Medium
Material in this manual was voluntarily established by Technical Committees of the 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 the ipc.
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