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Epox EP-8KHA+ with Socket 462 Mainboard

The Power Supply Unit also known as (P.S.U) is a crucial element in any personal computer since its the only element that provides the electrical juice neccessary for a PC to function. Just like a car has an engine to motor around, the PC has a PSU to control the power of its internal engines.

The PSU can be easily identified in a computer system. Take a look at the back of your computer and you should see a medium sized silver or gray box with an opening containing a the PSU fan and electrical circuitry, as well as an electrical voltage switch and a 1 or more openings for ventillation purposes.

Its main job is to supply power to all devices within the system through the use of connectors. The power supply must be, of course, attached to some electrical outlet usually located in the wall.

The PSU has a central fan that circulates air through a system to prevent peripheral devices from over heating. The fan is dependant on a good supply of air to operate efficiently because the fan pulls air through the power supply through the vent at the front and back sides of a case, and it circulates this air throughout the entire system and then sends air back out through the main supply fan vent.

Computer power supplies are rated by wattage, or the amount of power they can produced. Typical power supplies come in 220 watt configurations, but some may go as high as 500 watts.

The older Baby AT style power supplies were the most common type of power supply suitable for powering AT boards only. They lacked support for ATX motherboards and as a result were quickly phased out by the newer, better ATX technology.

The ATX motherboard requires a special ATX power supply connector which contains special circuitry that allows software to control the power signal of the supply.

The pages contained within this section will provide a fundamental understanding of how the power supply works as well as explain the main characterisitics that seperate the good power supplies from the bad.

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Epox EP-8KHA+ with Socket 462 Mainboard


What's On Board? How It Works PSU Wires
Connectors Illustrated Replacement Procedures Upgrade Procedures PSU Voltage And Frequency Levels

Replacement Procedures For Installing New Power Supply Unit

The first step in the replacement of your power supply is choosing an appropriate supply that will fit your casing unit. Atx power supplies will not fit into a MicroATX case but a MicroATX power supply will fit into both ATX and MicroATX cases. Once you have that determined you can remove the old power supply and insert the new one. This document will provide you with a walk-through on how to complete those tasks.

  1. Shut down the computer and power off the machine. This will involve shutting down the operating system, and unplugging the power cable running into the back of the power supply unit. To shut down your computer manually if running Windows 95, 98, ME and aare running an old AT based powers supply.On newer ATX power supplies there will be an additional switch you have to turn off to fully discharge any electrical static accumulated while completing the instruction detailed here.
  2. Disconnect all power cables and connectors from all devices in the system. External items that need to be unplugged before continuing. These items include:
  • The power cable
  1. Remove any screws attaching the power supply to the unit casing.
  2. Before removing the power supply it may be helpful to document any connectors in the system and the devices they are connected. This will be helpful when reconnecting the cables on the new power supply.
  3. Gently slide out the power supply unit which typically involves you pulling the unit out from either the front or back side.
  4. After you have removed the old power supply, you are ready to install the one. It may be helpful in the future to record the make, model, and total wattage of your new power supply.
  5. Insert the power supply into the metal bracket and secure it with the provided screws.
  6. Reconnect all power cables and connectors. These include the P8 and P9 motherboard power connectors, any hard and floppy disk cables and connectors, and any other peripheral devices you may need to attach a power connector controller cable to.
  7. If all cables are securely attached to all required devices within the system, the installation is complete. If you cannot boot up your system with the new power supply, then you may have attached a cable incorrectly, or it may be possible that your new power supply is defective.




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