• There are no items in your cart

BS 6221-21:2001

Withdrawn

Withdrawn

A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.

Printed wiring boards Guide to the rework of unassembled boards

Available format(s)

Hardcopy , PDF

Withdrawn date

13-02-2008

Language(s)

English

Published date

15-02-2001

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Classification of defects
5 General
6 Health and safety
7 Removal and restoration
   of protective coatings
8 Defective conductors
9 Lifted conductors
10 Lifted and defective lands
   associated with plain holes
11 Eyelet and tubular pin defects
12 Defective plated-through holes
   (double-sided boards)
13 Base laminate material defects
   (single- and double-sided boards)
14 Inclusions
15 Rework on inner layers of multilayer
   printed boards after lamination
16 Rework of printed
   edge contacts
Bibliography
Figure 1 - Defective conductors
Figure 2 - Tinned copper wire connections
Figure 3 - Insulated wire connections
Figure 4 - Straight conductor rework
           using parallel gap
           welding
Figure 5 - Lifted conductors
Figure 6 - Rework of damaged land
           using overlaid land
Figure 7 - Replacement bonded land
Figure 8 - Lifted land and conductor
Figure 9 - Eyelet and tubular pin
           defects
Figure 10- Rework of defective plated-
           through hole by the wire
           link method
Figure 11- Rework of defective plated-
           through holes (vias) by
           the eyelet method
Figure 12- Rework of defective plated-
           through holes (vias) by
           parallel gap welding: method 1
Figure 13- Rework of defective plated-
           through holes (vias) by
           parallel gap welding: method 2
Figure 14- Damaged base laminate materials
Table 1 - Type 1 defects
Table 2 - Type 2 defects
Table 3 - Applicability of methods for the
           rework of defective conductors

This part gives guidance on the rework of printed boards that has to be carried out in the normal course of fabrication and test before release to the user. Some of the techniques described are suitable for use after acceptance by the user, though their application may invalidate any formal unassembled board release documentation.

Committee
EPL/501
DevelopmentNote
Supersedes BS 6221-21(1984) (01/2001) Supersedes 99/202817 DC. (06/2005) Reviewed and confirmed by BSI, January 2008. (12/2007)
DocumentType
Standard
Pages
22
PublisherName
British Standards Institution
Status
Withdrawn
Supersedes

BS EN 61249-2-13:1999 Materials for interconnection structures. Sectional specification set for reinforced base materials, clad and unclad Cyanate ester non-woven aramid laminate of defined flammability, copper-clad
BS EN 61249-8-7:1997 Materials for interconnection structures. Sectional specification set for non-conductive films and coatings Marking legend inks
BS EN 61249-3-5:1999 Materials for interconnection structures. Sectional specification set for unreinforced base materials, clad and unclad (intended for flexible printed boards) Transfer adhesive films for flexible printed boards
BS EN 61249-3-3:1999 Materials for interconnection structures. Sectional specification set for unreinforced base materials, clad and unclad (intended for flexible printed boards) Adhesive coated flexible polyester film
BS EN 61249-3-4:1999 Materials for interconnection structures. Sectional specification set for unreinforced base materials, clad and unclad (intended for flexible printed boards) Adhesive coated flexible polyimide film - Adhesive coated flexible polyimide film
BS 4727-1:GRP11(1991) : 1991 GLOSSARY OF ELECTROTECHNICAL, POWER, TELECOMMUNICATION, ELECTRONICS, LIGHTING AND COLOUR TERMS - TERMS COMMON TO POWER, TELECOMMUNICATIONS AND ELECTRONICS - PRINTED CIRCUITS
BS EN 61249-7-1:1996 Materials for interconnection structures. Sectional specification set for restraining core materials Copper/invar/copper
BS EN 61249-8-8:1997 Materials for interconnection structures. Sectional specification set for non-conductive films and coatings Temporary polymer coatings
BS EN 61249-2-12:1999 Materials for interconnection structures. Sectional specification set for reinforced base materials, clad and unclad Epoxide non-woven aramid laminate of defined flammability, copper-clad
BS EN 61249-5-4:1997 Materials for interconnection structures. Sectional specification set for conductive foils and films with and without coatings Conductive inks
BS EN 61249-5-1:1996 Materials for interconnection structures. Sectional specification set for conductive foils and films with and without coatings Copper foils (for the manufacture of copper-clad base materials)

View more information
€155.16
Excluding VAT

Access your standards online with a subscription

Features

  • Simple online access to standards, technical information and regulations.

  • Critical updates of standards and customisable alerts and notifications.

  • Multi-user online standards collection: secure, flexible and cost effective.