In the equipment I'm servicing, a power supply lost its -15V part. The circuit board is crammed with components, half of which are unused, no documentation, no time to deal with them, just plug in spares. But when the seven worlds were lost, it got really frustrating. It seems that all elements are in order (transistors, stabilizers, microcircuits, capacitors). A tiny unmarked electrolytic capacitor from FLUKE read about 20uF (not bad, expected value for 47uF). Smart tweezers show the same? About 30 nanofarads. ESR? 280k ohms, while for the new 47uF ESR is in the milliohm range. You can fix it quickly and easily and it's fun. Sometimes I'm just curious, sometimes it gives me a better understanding. It works well with any size, down to the smallest detail in newer smartphones.
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