Sony Playstation 1 replacing the power unit

Before you start make sure that the console is turned off and unplugged before you begin the process. This is for the 1001 model types. With the 5501 and the 7001 and for the 9001 the process might be slightly different.
Step one: Open up the PS 1 console with a Phillips head screw driver and turn the console upside down and remove the 5 15.8 mm-long Phillips #1 screws.
Step two: While holding the top and bottom halves of the console together turn the PS 1 console back over. Lift the top cover straight up to remove it.
Step three: Unplug the power supply and then gently pull out the power supply cable straight up and out of its socket on the power supply to disconnect it.
Step four: Now remove the power supply and then remove the 2 14 mm-long Phillips #1 screws securing the power supply to the bottom of the case.
Step five: Lift out the outer edge of the power supply slightly, and then rotate the whole entire power supply away from the small clip on its inner edge to remove the power supply.
To reassemble your PS 1 console back together follow the above steps in reverse order.
Compare your new replacement part to the original part You might have to transfer the remaining components or remove adhesive backings from the new part before installing.