Disassembly and Power Chapter 5 PDF

Disassembly and Power Chapter 5 This presentation covers: > Qualities of a good technician > Disassembly and static electricity > Tools needed to work on computers > Reassembly > Power supply basics > Power protection  Qualities of a Good Technician “Soft skills” as they are kn...

Disassembly and Power Chapter 5 This presentation covers: > Qualities of a good technician > Disassembly and static electricity > Tools needed to work on computers > Reassembly > Power supply basics > Power protection  Qualities of a Good Technician “Soft skills” as they are known across many industries are essential Written Communication Skills Use this list to improve and avoid making the common mistakes: > Avoids doing documentation in a timely manner > Does not provide adequate or accurate information on what was performed or tried > Has poor spelling, grammar, capitalization, and punctuation skills > Writes in short, choppy sentences, using technical jargon > Does not provide updates on the status of a problem Written Communication Skills: Email The following is a list of guidelines for effective email communication: > Do not use email when a meeting or a phone call is more appropriate > Include a short description of the email topic in the subject line > Do not write or respond to an email when you are angry > Send email only to the appropriate people; do not copy others unnecessarily > Stick to the point; do not digress > Use a spelling and grammar checker; if one is not included in the email client, write the email in a word processing application, check it, and then paste the document into the email Written Communication Skills: Email (cont.) > Use proper grammar, punctuation, and capitalization; do not write in all uppercase or all lowercase letters > Smile when you are typing; your good attitude will come across in your writing > Focus on the task at hand; read your note over out loud if it is a critical one > Write each email as if you were putting the message on a billboard; you never know how the content might be used or who might see it  Disassembly and Electrostatic Discharge Disassembly Overview Sometimes, the only way to diagnose a problem is to disassemble the computer outside the case or remove components one by one. > Remove jewelry > Use proper lifting techniques > Keep humidity between 45 and 55 percent to reduce the threat of Electrostatic Discharge (ESD) > Use an anti-static wrist strap also called an ESD strap > Note: Do not wear an ESD wrist strap when working inside a CRT monitor or power supply > Anti-static bags are good for storing spare adapters and motherboards when the parts are not in use EMI (Electromagnetic Interference) > Also know as EMR (electromagnetic radiation)Noise caused by electrical devices > Many devices can cause EMI > e.g. a computer, a pencil sharpener, a vacuum cleaner, an air conditioner, and fluorescent lighting > A specific type that negatively affects computers is RFI (radio frequency interference) RFI (radio frequency interference) > RFI is noises that occur in the radio frequency range > Check the surrounding devices for the source of that problem > e.g., if the computer goes down only when the pencil sharpener operates or when using the optical drive, EMI could be to blame > EMI can also come through power lines > Move the computer to a different wall outlet or to a totally different circuit to determine whether the power outlet is the problem source > EMI can affect files on a hard drive Tools Tools can be divided into two categories: > Those you should not leave the office without > Those that are nice to have in the office, at home, or in the car Tools, cont’d 95% of all repairs are completed with the following basic tools: > Small and medium flat-tipped screwdrivers > #0, #1, and #2 Phillips screwdrivers > 1/4- and 3/16-inch hex nut drivers > Small diagonal cutters and needle-nose pliers Disassembly > Do not remove the motherboard battery, or the configuration information in CMOS will be lost > Use proper grounding procedures to prevent ESD damage > Keep paper, a pen, a phone, and a digital camera nearby for note taking, diagramming, and photo taking > Have ample flat and clean workspace > When removing adapters, do not stack the adapters on top of one another > Place removed adapters inside a special ESD protective bag Disassembly, cont’d > Handle each adapter, motherboard, or processor on the side edges > Avoid touching the gold contacts on the bottom of adapters. Sweat, oil, and dirt cause problems > Remember that hard drives require careful handling; a very small jolt can cause damage to stored data > You can remove a power supply, but do not disassemble a CRT- style monitor or power supply without proper training and tools > Document screw and cable locations; label them if possible Disassembly Basic Steps > Step 1. Remove Power and External Cables > Step 2. Open the Case > Step 3. Remove Internal Cables and Connectors > Step 4. Remove Adapters > Step 5. Remove Storage Devices > Step 6. Remove Motherboard Motherboard connectors/cables that go to the front panel Reassembly Reassembly > Be careful and properly diagram the disassembly > Write reminders or taking photos > Reinsert all components into their proper place; be careful to replace all screws and parts > Install missing slot covers > When reinstalling a motherboard, reverse the procedure used during disassembly > Ensure the motherboard is securely seated into the case and all retaining clips and/or screws are replaced Reassembly, cont’d > Ensure the ports extend fully from the case through the I/O shield > Ensure the drives and cover are aligned properly when the case is reinstalled > Ensure that cables are fully attached to devices and the same motherboard connector > Ensure that power cables are securely attached Preventive Maintenance A computer in a normal working environment should be cleaned at least once a year > Vacuum the computer and clean the optical drive laser, keyboard keys, printers, and display screen > Be sure to power down the computer and remove the power cord for any computer, remove the battery and AC adapter for a laptop or other mobile device, and allow a laser printer to cool before accessing internal parts > Always ensure that the device has proper ventilation and vents are clear of any obstructions Power Supply Power Supply Overview > A power supply is an essential component within a computer; internal computer devices do not work without it > The power supply converts AC to DC, distributes DC power to components throughout the computer, and provides cooling through the use of a fan located inside the power supply > The AC voltage a power supply accepts is normally either 100 to 120 volts or 200 to 240 volts Power Supply Form Factors > Power supplies come in different shapes and sizes, so do cases > Today’s power supply form factors are ATX, ATX12V v1.x, ATX12V v2.x, and micro-ATX. The ATX power supply form factor allows a small amount of voltage to be provided to the motherboard > The ATX12V version 2 standard has a 24-pin motherboard connector instead of a 20-pin version 1 connector and have a SATA power connector > The micro-ATX power supply form factor is a smaller version than a full-sized ATX power supply to fit in smaller cases > Laptop power supplies are commonly proprietary ATX Power Supply Connectors Auxiliary Fans – Air Flow Sample Computer Component Power Requirements Symptoms of Power Supply Problems The following is a list of symptoms of a power supply problem: > The power light is off and/or the device won’t turn on > The power supply fan does not turn when the computer is powered on > The computer sounds a continuous beep > When the computer powers on, it does not beep at all > When the computer powers on, it sounds repeating short beeps > The computer reboots or powers down without warning > The power supply fan is noisy Symptoms of Power Supply Problems > During POST, a 02X or parity POST error code appears; one of the POST checks is a power good signal from the power supply; a 021, 022,... error message indicates that the power supply did not pass the POST test > The power supply is too hot to touch > The computer emits a burning smell > The power supply fan spins, but there is no power to other devices > The monitor has a power light, but nothing appears on the monitor, and no PC power light illuminates Power Protection Power Protection Computers need a steady stream of AC that the power supply converts to DC. Sometimes the AC voltage is too high or too low. Protection can be provided with the following devices: > Surge suppressor – protects against overvoltage; may include a warranty > Line conditioner – conditions the AC voltage from the wall before passing it on to the computer > UPS – provides power during an outage and conditions the voltage when there is no outage > SPS – provides power during an outage Computer Terms Refer to the glossary terms at the end of the textbook chapter. Review Chapter 5 and become familiar with the terms.  This PPT deck was developed to support instruction of The Complete CompTIA A+ Guide to IT Hardware and Software 7th Ed. All text and images are © 2016 Pearson Education Inc. Fotolia Image Credits Chapter 5: yauhenka, StockPhotosArt, Dmitriy Melnikov, likasiri, Gudellaphoto, LoloStock, cristi180884, thodonal, WavebreakmediaMicro, anake, chokmoso, RZ, thodonal, unclepodger, Popova Olga, cristi180884, Stepan Popov, yauhenka, Style-Photography, Winai Tepsuttinun, magraphics.eu, vetkit, Andriy Brazhnykov, House @ Brasil, cristi180884, cristi180884