Page 52 - Testing Electronic Components

one of the same type and rating usually will bring the equipment back to
life again. However, sometimes a replacement might blow the fuse right
away when you switch on the equipment. To save the fuse, you can use
the series light bulb trick which I’m going to share to you in other article.

Some fuses even die of old age because fuses have lifespan too. But if the
inside of the glass fuse is black colour or darkened, and there is no trace
of the fuse element (the centre connector), you know that there was a
major short circuit somewhere in the circuit and most probably is the
power supply unit.

Measuring a fuse on board with an analogue multimeter

The common type and current rating of a fuse in a Monitor and Power
Supply is slow blow 3.15A to 5 Ampere 250 Volts. Here is the part on
how to test a fuse. Switch off the power of the equipment, remove the
casing and you will see a fuse usually located in the Ac input area or
power supply section. Measure the fuse with a either an analogue or a
digital multimeter. If you use an analogue meter then select the lowest
ohms range which is the x1 ohms.

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