May 16, 201412 yr Another reminder.... Change your smoke detectors every ten years. They do have an effective lifespan and do not last forever.
May 22, 201412 yr I had the same problem with a UPS at work. It's a power line filter capacitor. UPS was still working without problem but with a burning smell. I solder a new one and clean the pcb. UPS is back to normal.
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