(b)(4).Physio-control evaluated the customer device's and verified the reported issue.Physio replaced the device's system controller and user interface pcb assemblies to resolve the reported issue.After observing proper device operation through functional and performance testing, the device was returned to the customer for use.Physio-control further evaluated the removed user interface pcb assembly.No issue was found with this component.Physio-control further evaluated the removed system controller pcb assembly and observed that it was causing the test device to intermittently boot up with a white display.When this occurred, the device was inoperable.A further root cause for the boot-up issue could not be conclusively determined.
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The customer contacted physio-control to report that the service indicator is present and an event code is logged in the memory of their device.There was no patient use associated with the reported event.After evaluating and repairing the customer's device, one of the removed components was further evaluated by physio-control and it was observed that it would intermittently cause the test device to boot up with a white display and no functions would be available.As a result, defibrillation therapy would not be available, if it was needed.
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