Manufacturer's investigation conclusion: the report of a motor disconnected: m2 alarm observed during the self-check despite a motor being connected was confirmed and reproduced during testing of the returned centrimag 2nd gen primary console (sn: (b)(6).The returned console was evaluated and tested at mcs zurich under rma 19-112.The console was visually inspected and found to be in good condition.The console's log file was downloaded successfully.Per provided information, the reported event occurred on (b)(6) 2019.The retrieved data log file showed that the console had successfully passed a battery maintenance on 06sep2019.On 09sep2019 the console was again switched on.After the start-up sequence the console alarmed with a motor disconnected: m2 and flow sensor disconnected: f2 alarms.However, the analysis of the logged tech auxiliary data showed that the lmc motor temperature was between 26c and 27.8c, confirming that the motor was connected to the console at this point of time.(note: when no motor is connected to a 2nd gen console the value for the lmc motor temperature is at the end of the register range, which is -128c).Based on this temperature value it can be determined whether or not a motor was likely to have been connected.The log file confirmed the reported event.The console did not recognize the connected motor and alarmed with a motor disconnected:m2 alarm.The returned console was connected to mains power and powered on.After the start-up sequence, the console alarmed with a motor disconnected: m2 and flow sensor disconnected: f2 alarms, as intended because neither a motor nor a flow probe was connected.Then, a test motor and test flow probe were connected to the console.The flow sensor disconnected: f2 alert disappeared as intended.However, the motor disconnected: m2 message remained being displayed on the console and the "set rpm" option was not available on the console's display, reproducing the reported issue.Further testing revealed that the motor phase a h-bridge on the console's motor control (lmcebpx) printed circuit board (pcb) was defective.This caused the power stages to be disabled and the subsequent "motor disconnected: m2" alarm to be triggered.The root cause of the h-bridge for motor phase a becoming defective could not be conclusively determined during the investigation.The defective motor control pcb (lmcebpx pcb) was replaced with a new one, resolving the observed issue.Additionally, the cable "lemo motor interconnection" was also replaced with a new one, but only as a preventative action, because the cable was stressed during the investigation.Furthermore, the console's battery was noted to be near its expiration date (31may2020) and was replaced with a new one.The repaired and serviced console was then subjected to the repair and maintenance procedure and the unit passed all tests.The serviced and tested unit was returned to the distribution center for final processing and disposition.Reports of similar events will continue to be tracked and monitored.No further information was provided.The manufacturer is closing the file on this event.
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