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ECN
   
 
Problem:
An independent contractor for the United Stated Air Force had the need of some repairs on their GPS HPA Module Stations. The modules contained some transistors that short circuited causing a solder bridge. The independent contractor called on us to rework and re-pot the transistors in accordance with IPC class 3 standards. Without these module stations the Air Force could not fulfill some mission capabilities.
 
Solution:
Upon being contacted by the independent contractor eTech had suggested that they ship 2 of the module stations for a "first article" run. Once the module stations arrived our senior technician discovered that this rework was going to be an "out-of-the-box" project. The module stations were made of aluminum in which the board of transistors laid. In order to re-pot the transistors the modules would need to be pre-heated to a temperature that would liquefy the solder. Furthermore this would have to be done without damaging the module station or other components. Using an oven the module stations were pre-heated to start the process. In order to keep the modules heated they were placed on an IR heater while the soldering process was completed. The replacement transistors were repotted and leads were soldered to the board in a liquefied state. Once the transistors were placed the module stations then moved to an area to cool down. After repair the transistors were placed they then had to be cleaned and inspected in the accordance with IPC class 3 standards.
 
Ultimately, eTech was able to provide the outstanding support this customer needed. Due to the rapid response the Air Force was able to accomplish a milestone that was going to be a difficult task. eTech was able to support this independent contractor in a way that enabled the Air Force to fulfill 3 mission capability deficiencies that they have come across with their GPS stations. Since we first received the 2 "first run" articles the contractor has sent 20 or more of these modules stations to be reworked.