1. DIMM
    Dual inline memory module
  2. PSU
    • power supply unit
    • Receives and converts house current so that components inside the case can use it
    • –Most come with a dual-voltage selector switch 
    • • Allows switching input voltage from 115V to 220V
  3. SATA
    • Serial ATA standard (SATA)
    • –Used by most drives today
  4. PATA
    • Parallel ATA (PATA) – slower than SATA
    • – Also called IDE interface
    • – Uses 40-pin ribbon cable and connector
    • –Two connectors on a motherboard for two data cables 
    • – Accommodates up to four IDE devices
    • –Uses a 4-pin power connector called a  Molex power connector
  5. Floppy drive cable
    • –3.5-inch disk holding 1.44 MB of data
    • –Uses a 34-pin twisted cable
    • –Can hold up to two drives
  6. Rectifier:
    • Rectifier:
    • a device that converts AC to DC
  7. Inverter;
    • Inverter;
    • a device that converts DC to AC
  8. Transformer:
    Transformer:devices that changes the ratio of voltage to current
  9. A polarized plug
    • hot =thin
    • neutal=wide
  10. three-prong plug
    • hot        neutral
    •      ground
  11. FRU
    field replaceable unit
  12. field replaceable unit means
    • you are expected to know how to replace,
    • not how to repair it
  13. Fire extinguisher Class A
    can use water to put out fires caused by wood, paper, or other combustibles
  14. Fire extinguisher Class B
    can put out fires caused by liquids such as gasoline,kerosene, and oil
  15. Fire extinguisher Class C
    use nonconductive chemicals to put out a fire caused by electricity
  16. ESD
    Electrostatic discharge
  17. To protect against EDS
    • – Ground bracelet: also called ESD strap, antistatic wrist strap, or ESD bracelet
    •     • Attach bracelet to the computer case to ground it
    • – Ground mats: also called ESD mats 
    •    • Often used by bench technicians who repair and assemble computers at workbenches or assembly lines
    • – Static shielding bags: also called antistatic bags
    • –Antistatic gloves: also called ESD gloves
    • • Prevents ESD between you and a device when wearing
  18. ESD Rule 1
    When passing a circuit board or other component to another person, ground yourself and touch the other person

    • before
    • you pass it
  19. ESD Rule 2
    Leave components inside antistatic bags until ready to use them
  20. ESD Rule 3
    Work on hard floors, not carpet
  21. ESD Rule 4
    • Don’t work on a computer in a cold and dry 
    • atmosphere
  22. ESD Rule 5
    Remove packing tape and cellophane from around work area (materials that attract ESD)
  23. ESD Rule 6
    Keep components away from hair and clothing
  24. When working on sensitive low-voltage equipment such as a motherboard or processor:
    –Ground yourself with an anti-static grounding bracelet connected to a ground
  25. When working with power supplies, printers, and CRT monitors that contain capacitors:
    –Do not ground yourself because power can flow through you to the ground and you may get shocked
  26. Power supplies and monitors are considered
    field replaceable units
Card Set