Device evaluation of monitor sn (b)(4) has been completed.The reported problem (delivers monophasic pulse) has not been confirmed.Upon investigation the monitor's flag reports do not indicate that the monitor delivered a monophasic pulse and it was unable to be duplicated.It was determined that the monitor was unable to run the detect and treat testing due to service code 204.The cause for service code 204 is a shorted pin 3 on component u409.During the evaluation, it was found that service code 105 was displayed.The cause for the failure was isolated to the defibrillator pca and computer/analog board, where high voltage travelled to low voltage circuitry, damaging multiple components (q2 and q16) on the pcas.The root cause for the shorted component u409 could not be positively identified.The root cause for the high voltage travelling to low voltage circuitry could not be positively identified.No adverse event resulted from the defective monitor.
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