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A+ certification training:

A+ certification training:. Electricity/Power Supply. Electricity for Computers. Electric Outlet in Walls: AC,110-120 Volts Motherboard Uses DC,+3,-3,+5,-5,+12,-12 What’s the Solution?. THE POWER SUPPLY!. Changes 110-120 Volts to +-5,+-12 Changes AC to DC Wall outlet. HOT. NEUTRAL.

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A+ certification training:

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  1. A+ certification training: Electricity/Power Supply

  2. Electricity for Computers • Electric Outlet in Walls: AC,110-120 Volts • Motherboard Uses DC,+3,-3,+5,-5,+12,-12 • What’s the Solution?

  3. THE POWER SUPPLY! • Changes 110-120 Volts to +-5,+-12 • Changes AC to DC Wall outlet HOT NEUTRAL GROUND

  4. SYMBOL FOR GROUND

  5. REVIEW OF TERMS • VOLTS- PRESSURE IN A CIRCUIT • OHMS- A CONDUCTORS RESISTANCE • WATTS- POWER IN A CIRCUIT • AMPS- A CURRENTS STRENGTH • CONTINUITY- A COMPLETE CIRCUIT

  6. THREE PARTS OF A POWER SUPPLY • SWITCHING NETWORK • TRANSFORMER • VOLTAGE REGULATOR

  7. SWITCHING NETWORK CLEANS AND CONVERTS THE “IRREGULAR” INPUT AC INTO “REGULAR” DC

  8. TRANSFORMER TAKES THE “REGULAR DC 120 VOLT” INTO SEPARATE 12 AND 5 VOLT AC CIRCUITS

  9. VOLTAGE REGULATOR • CONVERTS AC BACK TO DC • REGULATES VOLTAGE TO CONSTANT LEVEL • MONITORS AMOUNT OF CURRENT BEING USED BY COMPUTER

  10. PARTS OF THE SWITCHING NETWORK • FUSES-GLASS TUBE, BURNS WHEN TOO MUCH CURRENT FLOWS • CAPACITORS-LOOKS LIKE BATTERIES, EVEN OUT CURRENT FLOW • DIODES- KEEPS CURRENT IN 1 DIRECTION • RECTIFIERS- MADE UP OF DIODES, PRODUCE HALF WAVE AND FULL WAVE RECTIFICATION • TRANSISTORS-CONVERTS DC INTO “SQUARE” WAVES

  11. PARTS OF THE TRANSFORMER CONSIST OF ONLY ONE DEVICE! THE TRANSFORMER ITSELF! IT CONSIST OF 2 COILS WHICH “STEP DOWN” OR REDUCE THE VOLTAGE DOWN TO 5 AND 12 VOLTS

  12. PARTS OF THE VOLOTAGE REGULATOR • RECTIFIER-MAKE AC BACK INTO DC • CAPACITORS-SMOOTH OUT AC RIPPLES LEFT INTO SMOOTH DC • COILS- FILTERS OUT AC

  13. ESD- ELECTORSTATIC DISCHARGE • AS LITTLE AS 10 TO 30 VOLTS CAN DESTROY COMPONENTS ON A MOTHERBOARD! • YOU CAN ONLY FEEL VOLTAGE OF 2000 VOLTS OR GREATER! • CMOS CHIP MOST SUCCEPTIBLE TO ESD

  14. PREVENTING ESD • USE ANTI STATIC BAGS FOR COMPUTER COMPONENTS • USE ANTI STATIC WRIST BAND WHEN WORKING ON PC’S AND GROUND YOURSELF OF MAT OR PC FRAME • STAY AWAY FROM MONITORS WHEN WEARING THIS, THEY HAVE 20,000 VOLTS WHICH COULD KILL YOU!

  15. POWER SUPPLY USE MOLEX CONNECTORS • P8 AND P9’S- USED ON AT MOTHERBOARDS. BLACK WIRE FROM P8 HAS TO LINE UP BESIDE BLACK WIRE FROM P9 • THE MOLEX ON THE ATX IS NOT A P8 OR P9 AND HAS BLACK WIRES ALREADY AUTOMATICLY LINED UP

  16. MOLEX CONNECTORS WIRE COLORS 5 DC GROUND GROUND 12 DC

  17. POWER SUPPLY FACTS • USE 200-230 WATTS • BREAK DOWN MORE THAN ANY OTHER PART BESIDES FLOPPY DRIVES • WHEN HAVING PROBLEMS CHECK: • ALL CONECTIONS • FAN • FUSE

  18. CLUES IT’S A POWER SUPPLY PROBLEM • FREQUENT LOCKING UP WHEN POWERING ON COMPUTER • OCASIONAL AND DIFFERENT ERROR CODES WHEN BOOTING UP • FREQUENT LOCKING UP

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