1、Lessons Learned Entry: 0308Lesson Info:a71 Lesson Number: 0308a71 Lesson Date: 1993-09-21a71 Submitting Organization: JPLa71 Submitted by: Jim TaylorSubject: Solder Balls in Flight Modules Abstract: Because a design change had been made to the proven Mariner design, the Viking orbiter flight radio m
2、odules developed short circuits caused by solder balls shorting terminal lugs to ground. Review related applications for known solder ball problems, and evaluate each design to determine whether solder can flow into uninspectable areas.Description of Driving Event: Viking orbiter flight radio module
3、s developed short circuits caused by solder balls shorting terminal lugs to ground. For solderability and several other reasons, a design change had been made to the proven Mariner design. Solving the solder ball problem required $250k (in the mid-1970s) for the rework of one flight subsystem and se
4、veral assembled and tested modules.Additional Keyword(s): Fabrication, SolderingLesson(s) Learned: Changing a design having a successful history always carries some risk. A simple design change, made for good reasons, may cause unanticipated new problems.Recommendation(s): Before making design chang
5、es, related applications should be reviewed for known problems with this solder ball effect. Evaluate each design to determine whether solder can flow into uninspectable areas.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Evidence of Recurrence Con
6、trol Effectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Hardwarea71 Parts Materials & ProcessesAdditional Info: Approval Info: a71 Approval Date: 1985-12-19a71 Approval Name: Carol Dumaina71 Approval Organization: 125-204a71 Approval Phone Number: 818-354-8242Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
