2. Lesson 3 System Power Core Hardware Fundamentals

3. Objectives Describe the function of a power supply. Measure power supply voltages and compare the results to expected voltages. Identify when the use of an Uninterruptible Power Supply (UPS) would be appropriate. Identify potential high-voltage hazard areas. Describe methods for reducing the potential risk from electrostatic discharge (ESD).

4. Objectives Describe the power on self test (POST) process. Describe the role of the operating system in system startup.

5. Power Terms Electricity Conductor Insulator Resistance Circuit Voltage Current Power Ground

6. Power Supply Function

7. Measuring AC Voltages 0 VACNeutral (larger) vertical slot and ground Neutral to Ground 110 – 120 VACHot (smaller) vertical slot and ground Hot to Ground 110 – 120 VACHot (smaller) vertical slot and neutral (larger) slot Hot to Neutral Expected ReadingLead PlacementTest

8. AT Motherboard Connectors BlackGroundP8-6 BlackGroundP8-5 Blue-12P8-4 Yellow+12P8-3 Red+5P8-2 Orange+5P8-1 Standard Color VoltagePin Red+5P9-6 Red+5P9-5 Red+5P9-4 White-5P9-3 BlackGroundP9-2 BlackGroundP9-1 Standard Color VoltagePin

9. ATX Motherboard Connectors Yellow+ 1210 Purple+ 59 Gray+ 58 BlackGround7 Red+ 56 BlackGround5 Red+ 54 BlackGround3 Orange+ 3.32 Orange+ 3.31 Standard ColorVoltagePin Red+ 520 Red+ 519 White- 518 BlackGround17 BlackGround16 BlackGround15 GreenPS_On14 BlackGround13 Blue- 1212 Orange+ 3.311 Standard ColorVoltagePin

10. Disk Drive Power Connectors PinVoltageColor 1+ 12Yellow 2GroundBlack 3GroundBlack 4+ 5Red

11. Portable Batteries Nickel Cadmium (Ni-Cad) Nickel Metal-Hydride (NiMH) Lithium-Ion (Li-ion)

12. Power Protection Surge Suppressor Line conditioner Standby power supply (SPS) Uninterruptible power supply (UPS)

13. Power Concerns Electromagnetic interference (EMI) Electrostatic discharge (ESD)

14. Shock hazards Power supply Display monitor

15. Laser Hazard Laser printer CD-ROM drive DVD drive