As a precaution, physio-control replaced both the system controller (sc) and user interface (ui) pcb assemblies and after observing proper device operation through functional and performance testing the unit was returned to the customer for use.Physio further examined the ui pcb assembly and observed that an integrated circuit (ic) chip, designator u8, would cause an intermittent blank screen; however, the unit was otherwise operational and would still deliver defibrillation therapy when prompted.There was no evidence of a device lock up observed.The removed sc pcb assembly was an ancillary part and there was no failure of the assembly.The cause of the original issue, device lock up, could not be determined.
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