Browse Prior Art Database

Reworking of Component Bearing Cards

IP.com Disclosure Number: IPCOM000089139D
Original Publication Date: 1977-Sep-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Kozik, AF: AUTHOR

Abstract

In the reconditioning of products and/or in the addition of engineering changes or new features to such products, it has been customary to replace the circuit cards with updated ones and to scrap the outdated cards. Such cards can be salvaged and reworked by the procedures described below.

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Reworking of Component Bearing Cards

In the reconditioning of products and/or in the addition of engineering changes or new features to such products, it has been customary to replace the circuit cards with updated ones and to scrap the outdated cards. Such cards can be salvaged and reworked by the procedures described below.

The card 1 (Fig. 1) to be reworked will be prepared by removal of unneeded components and breaking of wired connections with the addition of any new components on the component side (the back of the card is shown). A new printed circuit comprising a sheet 2 of a thin flexible material is prepared with a pattern of printed circuits, as required, to modify the circuits on board 1 to add the desired new features. The pattern will be on the side away from board 1 and will have a soldering tab 4 (Fig. 2) at each point it is to be connected to a contact point on board 1. A hole 5 is made through tab 4 and sheet 2 to enable a solder connection to be made from tab 4 through the sheet to a contact point on board
1.

In some cases, it may be inconvenient to solder through hole 5. Therefore, the arrangement shown in Fig. 3 may be used. Here, a headed pin 6 is passed through the hole 5 from the clear side of sheet 2. It will be soldered to tab 4 and have its headed end connected to a contact point on board 1.

This type of modification of circuit boards can be inexpensive in comparison with the cost of new boards with components, and offers the advantages...