Page 94 - Testing Electronic Components
P. 94
How To Discharge Capacitor
Capacitor discharge is the first thing you should do as an electronic
repairer before touching the power supply section. The large filter
capacitor in the power supply section can hold dangerous high voltage
even if the unit has been off for few days. It is advisable to discharge the
filter capacitor first before you start to troubleshoot in order protect
yourself from electrocuted.
Though the capacitor current stored in the capacitor cant kill you but it is
enough to burn your hand, fingers and your skin when you accidentally
touch it and the worst case is while youre carrying the Monitor or TV,
you might just throw off the equipment when you got a shocked from the
filter capacitor and the cathode ray tube monitor may break and cause the
flying glasses to hit your body or eyes.
Just be cautious when handling the power supply area. You can always
use a meter to confirm whether there is still charge in the capacitor. Place
your meters black probe to the capacitor negative pin (you can see the
negative marking at the sleeve of the capacitor) and the red probe to other
pin. If there is high voltage registered in your meter then you have to
discharge the capacitor otherwise you may proceed to repair the
equipment. Typical value for this type of filter capacitor is 220 to 330
microfarad with a 400 to 450 voltage rating.
The large filter capacitor in power supply section
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