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Error Correction Rework Stud

IP.com Disclosure Number: IPCOM000087346D
Original Publication Date: 1977-Jan-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Johnson, AH: AUTHOR

Abstract

In circuit boards and modules having internal circuitry, it is frequently necessary to break certain defective conductive lines while making an electrical connection to an element, as, for example, an integrated circuit device mounted on the board or module. Referring to Fig. 1, assuming a defect is present in lines 10 and/or 12, the assembly might be salvaged if the connection to these lines were made at another point on the board, the connection to via 14 severed, and a connection to device 16 made.

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Error Correction Rework Stud

In circuit boards and modules having internal circuitry, it is frequently necessary to break certain defective conductive lines while making an electrical connection to an element, as, for example, an integrated circuit device mounted on the board or module. Referring to Fig. 1, assuming a defect is present in lines 10 and/or 12, the assembly might be salvaged if the connection to these lines were made at another point on the board, the connection to via 14 severed, and a connection to device 16 made.

Referring to Fig. 2, a hole 18 is drilled from the backside of the board through wiring 10 and 12. The hole 18 will have a diameter as large as possible but small enough not to damage any adjacent lines. A special pin 20 (Fig. 3) with a tinned point 26 (Fig. 4) is then placed in the hole, heated to form a solder joint connection to the partially drilled via hole, and a connection made to the pin with a discrete wire to the appropriate connection at another point on the board. The pin 20 has a layer of insulation 24 about the sidewalls and the tinned point 26. The insulating layer 24 prevents electrical contact to lines 10 and 12. When the pin is heated to form a connection between it and the via 14, the plastic coating 24 will also melt to form a seal.

An alternative is to use epoxy to seal around the head 28 of the pin. Threads or other mechanical locking shapes can also be used. Furthermore, the internal connection can also be made by...