Details of complaint: the customer stated that the prefense central station (edns) showed no signs of activity, and the activity led was not lit.The customer was advised that nihon kohden (nk) no longer supports the edns, and it cannot be repaired.The unit was monitoring telemetry transmitters.No patient harm or injury was reported.Investigation summary: the customer was not interested in troubleshooting/investigating the issue and had decided to just replace the edns with an rns.The device had been in service since (b)(6) 2012.A review of the history of the serial number identified no other issues reported on the device.Based on the available information, a definitive root cause could not be identified.Possible causes of the issue are improper shutdown, ups failure, a loose or damaged power cable, and wear and tear of the device components such as the power supply and power brick.
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