Rosewill Computer Case 422 Informations techniques télécharger pdf (Page 41)

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Chapter 4 • Disassembly and Power

• AC circuit tester

• Right-angled, flat-tipped, and Phillips screwdrivers

• Hemostats

• Pliers

• Optical laser cleaning kit

• Nonstatic vacuum or toner vacuum

• Disposable gloves

• Small plastic scribe

• T8, 10, 15, 20, and 25 Torx (star) screwdriver

You could get some nice muscle tone from carrying all these nice-to-have but normally

unnecessary tools. When starting out in computer repair, get the basics. As your career path

and skill level grow, so will your tool kit. Getting to a job site and not having the right tool can

be a real hassle. However, because there are no standards or limitations on what manufacturers

can use in their product lines, it is impossible to always have the right tool on hand. However,

always remember that no tool kit is complete without an antistatic wrist strap.

Opening the Case

Opening or removing the case is sometimes the hardest part of disassembly. Some manufactur-

ers have tabs or covers over the retaining screws, and others have retention levers or tabs that

have to be depressed before the cover slides open or away. For some computers you must press

a tab on top of the computer downward while simultaneously pressing upward on a tab on the

bottom of the computer. Once the tabs are pressed, the cover can be pried open. Sound like a

two-person job? Sometimes it is.

Some cases have screws that loosen but do not have to be removed all the way to remove

or open the case. For all computer screws, make diagrams and use an egg carton and label

each section of the carton with where you got the screws. When possible, refer to the manufac-

turer’s directions when opening a case.

Cables and Connectors

Internal cables commonly connect from a device to the motherboard, the power supply to a

device, the motherboard to the front panel buttons or ports, and/or from a card that occupies

an expansion space to the motherboard. Cables can be tricky. Inserting a cable backward into

a device or adapter can damage the device, motherboard, or adapter. Most cables are keyed so

the cable inserts into the connector only one way. However, some cables or connectors are not

keyed.

Removing a cable for the first time requires some muscle. Many cables have a pull tab or

plastic piece used to remove the cable from the connector and/or device. Use this if possible

and do not yank on the cable. Some cables have connectors with locking tabs. Release the lock-

ing tab before disconnecting the cable; otherwise, damage can be done to the cable and/or con-

nector.

Be careful with hard drive cables. Some of the narrow drive cables, such as the one shown

in Figure 4.3, are not as sturdy and do not connect as firmly as some of the other computer

cables. Also, with this particular cable type, it does not matter which cable end attaches to the

device. A 90⁰-angled cable (see Figure 4.4) may attach to devices in a case that has a limited-

space design and may have a release latch.

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