The reported complaint of the lcd display on the autopulse platform (serial #(b)(4)) does not work was confirmed during functional testing and visual inspection.The investigation findings revealed intermittent distorted characters on the lcd display.The root cause of the distorted characters lcd display issue was due to a damaged membrane keyboard, possibly attributed to mishandling such as drop.The patient's vomit on the display did not contributed to the distorted characters display.To remedy the display issue, the user interface membrane switch assembly was replaced.Unrelated to the reported complaint, the autopulse's encoder drive shaft does not rotate smoothly, exhibits binding and resistance.The root cause was due to a sticky clutch plate likely attributed to wear and tear.The returned autopulse platform was manufactured in december 2011 and it is over 9 years old, well past beyond the expected serviceable life of 5 years.Deburring was performed to remedy the sticky clutch plate.The autopulse passed the initial functional test without any fault or error.After service repair completion, the autopulse was subjected to the run-in test using the 95% patient large resuscitation test fixture (lrtf) with good known test battery until discharged without any fault or error.The load cell characteristic test passed.The autoplatform platform passed all other functional tests.Historical complaints were reviewed for service information related to the reported complaint and there was no similar complaints reported for autopulse with serial number (b)(4).
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