presentation 2 – the power supply
DESCRIPTION
Presentation 2 – The Power Supply. Objectives. At the end of this presentation, you will be able to:. Identify the input and output voltages of the power supply. Demonstrate the proper method to measure the DC output voltages of the power supply. - PowerPoint PPT PresentationTRANSCRIPT
Copyright © 2007 Heathkit Company, Inc. All Rights Reserved
PC Fundamentals
Presentation 2 Presentation 2 –– The Power Supply The Power Supply
2
ObjectivesObjectives
At the end of this presentation, you will be able to:
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Identify the input and output voltages of the power supply.
Demonstrate the proper method to measure the DC output voltages of the power supply.
Explain how power is distributed throughout the computer.
Demonstrate the proper method to remove and replace the power supply in the computer.
Compute the power consumption of the PC.
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The Power Supply.The Power Supply.
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The Power SupplyThe Power Supply
FAN
AC Receptacle
On/Off Switch
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Power Supply Input VoltagePower Supply Input Voltage
100 to 125 VAC @ 60 Hz200 to 250VAC @ 50 Hz
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Motherboard Form FactorsMotherboard Form Factors
AT-Type
ATX-Type
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AT MotherboardAT Motherboard
12”12”
13.5”13.5”
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ATXATX Motherboard Motherboard
9.6 ”9.6 ”
12 ”12 ”
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ATXATX Mother- Mother-
boardboard
ATX Power DistributionATX Power Distribution
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Power Supply Output VoltagesPower Supply Output VoltagesATX-TypeATX-Type
+5 Volts
+12 Volts
-12 Volts
-5 Volts
+3.3 Volts
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ATX Motherboard Power Connector
ATX Motherboard Power Connector
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20-Pin PowerConnector
20-Pin PowerConnector
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24-Pin PowerConnector
24-Pin PowerConnector
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2 X 10 ATX Connector
2 X 2Connector
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Edge View of Motherboard.Edge View of Motherboard.
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A Second 2 X 2 A Second 2 X 2 Motherboard Power Motherboard Power Connector Supplies Connector Supplies
Processor Core PowerProcessor Core Power(+12 Volts)(+12 Volts)
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AT Power DistributionAT Power Distribution
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Power Supply Output VoltagesPower Supply Output VoltagesAT-TypeAT-Type
+5 Volts
+12 Volts
-12 Volts
-5 Volts
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Power ConnectorPower Connector
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P9P9P8P8
BlackWiresBlackWires
Motherboard Power ConnectorsMotherboard Power Connectors
Some connectors are held in place Some connectors are held in place by a latch.by a latch.
LatchLatch
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P9P9
GroundGround
GroundGround
+5V+5V
+5V+5V
+5V+5V-5V-5V
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P8P8
-12V-12V+12V+12V
GroundGround
GroundGround+5V+5V
Power Good Power Good
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The Power Good SignalThe Power Good Signal+5 Volt signal generated by the power
supply.
It indicates that the power supply has passed its self test and that its output voltages have stabilized.
Usually occurs within first 0.5 seconds.
Prevents the system from running under bad or unstable power conditions.
Large Molex ConnectorLarge Molex Connector
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+5V
+12VGround
4-Pin MolexConnector
Berg ConnectorBerg Connector
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+5V
+12VGround
4-Pin BergConnector
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Grasp the connector
by the shell…
Never by the leads.
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Replacing the Power SupplyReplacing the Power Supply
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Disconnect the AC Power Cord.
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On-OffSwitch
On-OffSwitch
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Power toMotherboard
Power toMotherboard
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The Power Supplyis held in placeby four screws.
The Power Supplyis held in placeby four screws.
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PowerSupplyPowerSupply
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Reinstall the power supply.Reinstall the power supply.
Copyright © 2007 Heathkit Company, Inc. All Rights Reserved
PC Fundamentals
EndEnd