Hello, I currently have a problem with a crystal used on one of our PCBs. When the board is first mounted in the unit a faulted circuit indicator)it is tested. Once it passes the tests an LED is glued to the enclosure that the PCB is mounted in using an ultraviolet flood lamp. The enclosure is then potted with an epoxy resin and the enclosure is sealed using an ultrasonic welding process. Somewhere between the initial test and the final test the crystal that is used for the microcontroller fails. Does anyone have any suggestions? Would one company make a stronger crystal than the other? The failure rate is about 5%.
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