Switch over mode power supply contain some large filter capacitors that can hold unsafe charges also if the device has actually not been utilized for numerous days. Common values of this kind of filter capacitor are 220uf 250volt as well as 330uf 400volt! If you are going to work on the power supply circuits, it’s a smart idea to discharge that capacitor initially.
There are three methods to release the huge filter capacitor in a power supply.
1) Discharge it with a screw motorist (not advised).
The reason for not making use of the screw chauffeur to release high voltage polypropylene film capacitors is because
– the published motherboard or circuitry could be damage as a result of the spark created while releasing the high voltage capacitor.
I as soon as blowed the power section utilizing this technique. Nevertheless, if you know that the capacitor stored voltage is not as well large, you could easily discharge it with a small screw motorist.
– if the high voltage polypropylene film capacitors hold a larger fee of electricity. Releasing the capacitor could thaw the pointer of the screw motorist as well as the copper on the published motherboard.
– Sometimes a much heavier stimulate might trigger tiny disintegrated solder lead or copper to fly out from the circuit card as well as may hurt your eyes.
2) Place the leads of a socketed 100 watt electric bulb on the leads of the capacitor.
This technique had been used by numerous service technicians all over the world for the light bulb will function as an indication to see if the high voltage polypropylene film capacitors still holds the cost. If there is a fee the light bulb will light and after discharged the light bulb will goes off.
3) Place the leads of a high wattage resistor on the leads of the high voltage polypropylene film capacitors.
I use a 2.2 k ohm 10 watt resistor to release the high voltage capacitor in a button setting power supplies. It is basic to use and also very effective.It takes just number of secs to completely release the high voltage polypropylene film capacitors.
I highly recommend for those who make use of screw vehicle driver to release high voltage polypropylene film capacitors to swift to the 2nd and 3rd technique as these is the safest method to shield the circuit as well as most significantly is yourself.
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