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Browse Prior Art Database

Printed Circuit Rework Pattern

IP.com Disclosure Number: IPCOM000106435D
Original Publication Date: 1993-Nov-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Urda, EJ: AUTHOR

Abstract

Disclosed is a method which permits electrical rework (softwires and isolations) on the printed wiring board top side surface for pin-in-hole or blind terminal type electronic components. Traditionally, bottom side or back side access to the printed wiring board is needed for such rework. This access is not always obtainable without significant cost impact.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Printed Circuit Rework Pattern

      Disclosed is a method which permits electrical rework
(softwires and isolations) on the printed wiring board top side
surface for pin-in-hole or blind terminal type electronic components.
Traditionally, bottom side or back side access to the printed wiring
board is needed for such rework.  This access is not always
obtainable without significant cost impact.

      In the Figure, the component is wired into holes (1) which are
externally connected to, but are not part of the component's terminal
area (2).  Between these holes and the actual terminal area, there is
a set of softwire rework pads (3) and circuit line cut isolation
neckdown points (4).  These rework pads and isolation points provide
a means of achieving electrical rework (softwires and isolations) for
both the component pin and its wired electrical net, with all rework
contained to a single side (top side) of the printed wiring board.
With this, printed wiring board bottom side (back side) access is not
required.

NOTE: The term softwire is synonymous to rework wire, haywire, and
add wire.