1.1 Identify the fundamental principles of using personal computers
PC power supplies deliver required DC power to the computer electronic sub-systems including Motherboard, Hard drive, CDROM drive, Keyboard, Mouse, and others. Usually, regular CRT monitors derive power separately from the mains. PC power supplies work by converting the AC mains power supply to required DC power supplies.
There are mainly two types of power supplies used in computers:
ATX12V power supplies are intended to be downward compatible with ATX power supplies.
The voltages produced by ATX/ATX12V power supplies are:
ATX and ATX12V power supply connectors pin configuration is shown below:
In addition to the Motherboard power connector, a power supply may have a CPU power connector, and an Auxiliary power connector.
Following are the most commonly used power supply connectors:
To power up an ATX or ATX12V PSU for testing, short pin 14 (PS_ON) with any of the ground pins.
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