The returned device was evaluated.During inspection the device was found to be unable to power on via dc, and was unable to remain powered on when switching from ac to dc power.The device was able to obtain readings normally; however there was no audio in any form from either speaker.Internal inspection indicated a missing battery, missing system board grounding screw, and speakers which measured within voltage specifications.Further analysis isolated the speaker failure to a component (u20) of the system board.A service history record review reveals that this unit was in the field for over two (2) years with no previous reported issues related to this reported event.
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