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Exercise 7Exercise 7The Power SupplyThe Power Supply
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The Power Supply.The Power Supply.
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Power Supply Input VoltagePower Supply Input Voltage
100 to 125 VAC @ 60 Hz100 to 125 VAC @ 60 Hz 200 to 250VAC @ 50 Hz200 to 250VAC @ 50 Hz
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Motherboard Form FactorsMotherboard Form Factors
AT-TypeAT-Type
ATX-TypeATX-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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AT Power DistributionAT Power Distribution
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Power Supply Output VoltagesPower Supply Output VoltagesAT-TypeAT-Type
+5 Volts+5 Volts
+12 Volts+12 Volts
-12 Volts-12 Volts
-5 Volts-5 Volts
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Power ConnectorPower Connector
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Edge View of Motherboard.Edge View of Motherboard.
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Voltage RegulatorVoltage Regulator
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P9P9P8P8
BlackWiresBlackWires
Motherboard Power ConnectorsMotherboard Power Connectors
P9P8
Back Probing P8 and P9Back Probing P8 and P9
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Some connectors are held in Some connectors are held in place by a latch.place by a latch.
LatchLatch
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 +5 Volt signal generated by the power supply.supply.
It indicates that the power supply has It indicates that the power supply has passed its self test and that its output passed its self test and that its output voltages have stabilized.voltages have stabilized.
Usually occurs within first 0.5 seconds.Usually occurs within first 0.5 seconds.
Prevents the system from running under Prevents the system from running under bad or unstable power conditions.bad or unstable power conditions.
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Large Molex ConnectorLarge Molex Connector
+5V
+12VGround
4-Pin MolexConnector
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Berg ConnectorBerg Connector
+5V
+12VGround
4-Pin BergConnector
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Grasp the connector
by the shell…
Never by the leads.
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ATX Power DistributionATX Power Distribution
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Power Supply Output VoltagesPower Supply Output VoltagesATX-TypeATX-Type
+5 Volts+5 Volts
+12 Volts+12 Volts
-12 Volts-12 Volts
-5 Volts-5 Volts
+3.3 Volts+3.3 Volts
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ATX Motherboard Power Connector
ATX Motherboard Power Connector
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PowerConnector
PowerConnector
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Replacing the Power SupplyReplacing the Power Supply
Disconnect the AC Power Cord.
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On-OffSwitch
On-OffSwitch
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Power toCD-ROM Drive
Power toCD-ROM Drive
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Power toHard Drive
Power toHard Drive
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Power toFloppy Drive
Power toFloppy Drive
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Power toMPU Fan
Power toMPU Fan
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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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PowerSupplyShelf
PowerSupplyShelf
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Reinstall the power supply.Reinstall the power supply.