https://jestineyong.com Semiconductors, Test Equipments, Circuit Board Troubleshooting, Electronic Repair Courses and Many More! Sat, 21 Aug 2021 11:16:02 +0000 en-US hourly 1 https://wordpress.org/?v=5.4.24 https://jestineyong.com/smoke-alarm-repair/ https://jestineyong.com/smoke-alarm-repair/#comments Sat, 21 Aug 2021 11:16:00 +0000 https://jestineyong.com/?p=25857               A 40-year-old mains powered smoke alarm started occasionally triggering without smoke and the prime suspect (other than dust) was the main 4.7 μF 50V electrolytic capacitor. The capacitor was checked with a Fluke 110 multi-meter which reported a healthy 5.18 μF and a cleanup stopped the false alarms […]

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