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Published byMaurice Dorsey Modified over 9 years ago
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1 Exercise 7 The Power Supply
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2 The Power Supply.
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3 Power Supply Input Voltage 100 to 125 VAC @ 60 Hz 100 to 125 VAC @ 60 Hz 200 to 250VAC @ 50 Hz 200 to 250VAC @ 50 Hz
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4 Motherboard Form Factors AT-Type AT-Type ATX-Type ATX-Type
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5 AT Motherboard 12” 13.5”
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6 ATX Motherboard 9.6 ” 12 ”
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7 AT Power Distribution
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8 Power Supply Output Voltages AT-Type +5 Volts +5 Volts +12 Volts +12 Volts -12 Volts -12 Volts -5 Volts -5 Volts
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9 Power Connector
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10 Edge View of Motherboard.
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11 Voltage Regulator
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12 P9 P8 Black Wires Black Wires Motherboard Power Connectors
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P9P8 Back Probing P8 and P9 13
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14 Some connectors are held in place by a latch. Latch
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P9 Ground + 5V - 5V 15
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P8 - 12V + 12V Ground + 5V Power Good 16
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17 The Power Good Signal +5 Volt signal generated by the power supply. +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. 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. Usually occurs within first 0.5 seconds. Prevents the system from running under bad or unstable power conditions. Prevents the system from running under bad or unstable power conditions.
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18 Large Molex Connector
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+5V +12V Ground 4-Pin Molex Connector 19
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20 Berg Connector
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+5V +12V Ground 4-Pin Berg Connector 21
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Grasp the connector by the shell… Never by the leads. 22
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23 ATX Power Distribution
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24 Power Supply Output Voltages ATX-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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25 ATX Motherboard Power Connector
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26 Power Connector Power Connector
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27 Replacing the Power Supply
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Disconnect the AC Power Cord. 28
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On-Off Switch On-Off Switch 29
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Power to CD-ROM Drive Power to CD-ROM Drive 30
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Power to Hard Drive Power to Hard Drive 31
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Power to Floppy Drive Power to Floppy Drive 32
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Power to MPU Fan Power to MPU Fan 33
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Power to Motherboard Power to Motherboard 34
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The Power Supply is held in place by four screws. The Power Supply is held in place by four screws. 35
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Power Supply Power Supply 36
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Power Supply Shelf Power Supply Shelf 37
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38 Reinstall the power supply.
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