The map alarm was not audibly working.The map drifted, alarm light came on, but no audible alarm heard.Alarms set appropriately, but ventilator did not sound when alarms reached.Manufacturer response for ventilator, sensormedics 3100a (per site reporter).Unit under a service contract.Called for service.Biomed told to look inside for speaker wire disconnect.Wire was off.Reconnected the wire, plugged unit in then removed ac power.Got an audible power fail alarm which shows speaker now working.Unit returned to service.
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