During system installation, the generator was not powering on correctly.The field service engineer (fse) replaced two boards within the generator as part of troubleshooting.After the replacements, the generator would not power on fully.Other connections were checked but no issue was observed.The generator was powered on once more and the transformer caught on fire.The fse extinguished the fire.Smoke was observed in the room but did not set off fire alarms.The room the generator is in, is separate from the patient treatment room.The fire did not spread beyond the transformer.No injury was reported.The generator was replaced.The original generator was shipped to accuray for inspection and then returned to the supplier for further investigation.Internal investigation revealed a misregistered connector on the control drac pcb, and a cracked power resistor on the input of the transformer in question.Final conclusion is the root cause of the fire was believed to be related to the power resistor failure.Supplier has confirmed this was a unique incident and no generators in production were identified to have a similar issue.No further action is needed.
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