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A user facility biomedical technician (biomed) contacted fresenius medical care (fme) technical support (ts) to report that a 2008k2 hemodialysis machine would not power on.The biomed stated the machine stops during power-up (at 15% of initialization) and just audibly alarms.It does not continue powering up.During troubleshooting the biomed noticed a defective wire (scorched) on the power switch in the power supply.They replaced the power supply assembly with another module (unknown to be good or not).The biomed also replaced the motherboard.The biomed unplugged the actuator/sensor cables from the distribution board and the problem continues to occur.Ts recommended the biomed replace the functional board or power logic board.The biomed was also advised to swap the power supply with a known good module.Upon follow-up with the biomed, it was reported that the power issue was resolved by replacing the functional board.The biomed said the replacement functional board was ordered through a third-party vendor, and the defective functional board was sent back to the vendor as part of an exchange.The biomed confirmed thermal damage was found during troubleshooting.One of the power supply wires was charred and melted.No burning smell was noticed.There were no signs of any smoke, sparks, or flames.A photo of the thermal damage could not be provided.The biomed confirmed the power assembly was the original fme manufactured part on the machine.No other parts or components appeared to be damaged.The biomed said the machine has approximately 23,000 operating hours on it.It was confirmed the machine had no history of failing the electrical leakage test.When in use, the biomed confirmed the machine remains plugged into a hospital grade ground-fault circuit interrupter (gfci) outlet.The power supply assembly that exhibited thermal damage was not available to be sent back for evaluation as it was reportedly discarded.The biomed confirmed the machine was back in service and fully operational.There was no patient involvement associated with this event.
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