Sony Playstation 2 Repair Manual page 12

Now we are going to test the power switch. MAKE
SURE THE POWER SWITCH IS IN THE ON
POSITION. Put one voltmeter lead on one of the
pins that the power cable plugs into and the other on
one of the pins of the white plug just inside the case.
You should get a 0 reading or a short. If not trying
moving to the other pin. A good plug will show a short
between each pin on the back and one of the wires on
the inside when the power switch is in the on position.
Last we will check the fuses. There are two located on
the power supply board. (see photo)
Take your voltmeter and put a lead on each side of a
fuse. You should read a short. If you don't, then the
fuse is blown and will need to be replaced. Read the
value of the fuse either written on the circuit board
beneath the fuse or on the silver connection on the end
of the fuse. The fuse by the power plug on mine is
3.25A (amps).
You may open your PS2 to find that your power
supply looks like this (see diagram) You cannot get to
the components as described above. You will need to
remove the bottom cover of the console and flip the
console upside down.
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