Browse Prior Art Database

Chip Removal by Hot Gas

IP.com Disclosure Number: IPCOM000089974D
Original Publication Date: 1968-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Tickner, CR: AUTHOR

Abstract

Printed circuit board 1, including chip 2 to be removed, is placed on heater 3 and heated to 150 degrees C. A supply of hot gas is passed into duct 4. The gas flows through valve 5 and along tube 6 out onto the surface of board 1. Valve 5 is controlled by solenoid 7. Valve 5 and solenoid 7 are mounted on plate 8, the position of which is controlled by rod 9 attached to a micromanipulator. Tube 6 is accurately positioned over chip 2 to be removed and the hot gas at 400 degrees C melts the solder. Valve 5 closes duct 4 and opens tube 6 to dust 10 connected to a vacuum source. Chip 2 is lifted off board 1 by the vacuum and can be replaced with a new chip. The latter can be soldered in position using the hot gas. The gas used is a mixture of 90% N(2) and 10% H(2).

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Chip Removal by Hot Gas

Printed circuit board 1, including chip 2 to be removed, is placed on heater 3 and heated to 150 degrees C. A supply of hot gas is passed into duct 4. The gas flows through valve 5 and along tube 6 out onto the surface of board 1. Valve 5 is controlled by solenoid 7. Valve 5 and solenoid 7 are mounted on plate 8, the position of which is controlled by rod 9 attached to a micromanipulator. Tube 6 is accurately positioned over chip 2 to be removed and the hot gas at 400 degrees C melts the solder. Valve 5 closes duct 4 and opens tube 6 to dust 10 connected to a vacuum source. Chip 2 is lifted off board 1 by the vacuum and can be replaced with a new chip. The latter can be soldered in position using the hot gas. The gas used is a mixture of 90% N(2) and 10% H(2).

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]