Results of investigation: this unit was field serviced by a vyaire medical authorized service technician.The service technician was not able to duplicate the customer's reported issue during testing and evaluation.The ventilator was opened for troubleshooting.Once turned on, the ventilator's oscillator ran for over 45 minutes without shutting down.Adjustments were made to the ddi board, pr3, and pr6.The power supply was checked along with the loop gain pot; all were within specification.The service technician also performed pt calibrations and performance check, all testings were passed per 3100a label.
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