The customer reported that when the transmitter is powered on, it displays waveforms without a patient connected to it.The device was returned to nihon kohden, evaluated, and the reported issue was confirmed.There was some kind of sticky residue in the socket the of center case.An exchange transmitter was sent to the customer.Cleaned the defective device and replaced parts to meet manufacturer's specification.Completed all steps per maintenance check sheet in operator's manual and performed an extended test for 2 days.Nihon kohden will submit a supplemental report in accordance with 21 cfr section 803.56 if additional information becomes available.
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