BS 6221-21:2001
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.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
Hardcopy , PDF
English
15-02-2001
13-02-2008
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Withdrawn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 |
This standard has been withdrawn and is no longer current. No replacement edition is available.
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