Rosewill Computer Case 422 Technical Information PDF herunterladen (Seite 49)

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Chapter 4 • Disassembly and Power

Reassembly

Reassembling a computer is easy if the technician is careful and properly diagrams the dis-

assembly. Simple tasks such as inserting the optical drive in the correct drive bay become

confusing after many parts have been removed. Writing down reminders takes less time than

having to troubleshoot the computer because of poor reassembly. Reinsert all components into

their proper place; be careful to replace all screws and parts. Install missing slot covers, if pos-

sible.

Three major reassembly components are motherboards, cables, and connectors. When

reinstalling a motherboard, reverse the procedure used during disassembly. Ensure that the

motherboard is securely seated into the case and that all retaining clips and/or screws are

replaced. This procedure requires practice, but eventually a technician will be able to tell when

a motherboard is seated into the case properly. Visual inspection can also help. Ensure that the

ports extend fully from the case through the I/O shield. As a final step, ensure that the drives

and cover are aligned properly when the case is reinstalled.

Cables and connectors are the most common source of reassembly problems once the

motherboard is installed. Ensure that cables are fully attached to devices and the motherboard.

Ensure that power cables are securely attached. Matching pin 1 on the cable to pin 1 on the

motherboard connector is critical for older ribbon cables. Attaching the correct device to the

correct cable can be difficult if proper notes were not taken.

Preventive Maintenance

Preventive maintenance includes certain procedures performed to prolong the life of a com-

puter. Some computer companies sell maintenance contracts that include preventive mainte-

nance programs. A computer in a normal working environment should be cleaned at least once

a year. Typical preventive measures include vacuuming the computer/printer and cleaning

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/netbook, and allow a laser printer to cool before accessing internal parts. Preventive

exercises for many individual devices are described in their respective chapters. For example,

the steps detailing how to clean CDs/DVDs/BDs are included in Chapter 8. This section gives an

overview of a preventive maintenance program and some general tips about cleaning solvents.

When performing preventive maintenance, power on the computer to be certain it oper-

ates. Perform an audio and visual inspection of the computer as it boots. It is a terrible feeling

to perform preventive maintenance on a computer only to power it on and find it does not

work. You will wonder if the cleaning you performed caused the problem or if the computer

had a problem before the preventive maintenance.

Repair companies frequently provide a preventive maintenance kit for service calls. The

kit normally includes a portable vacuum cleaner, special vacuum cleaner bags for laser print-

ers, a can of compressed air, a floppy head cleaning kit, urethane swabs, monitor wipes, lint-

free cloths, general-purpose cloths, general-purpose cleanser, denatured alcohol, a mouse ball

cleaning kit, an antistatic brush, gold contact cleaner, and an optical drive cleaning kit.

The vacuum is used to suck dirt from the inside of the computer. Ensure that you use

nonmetallic attachments. Some vacuum cleaners have the ability to blow air. Vacuum first and

then set the vacuum cleaner to blow to get dust out of hard-to-reach places. Compressed air

can also be used in these situations. The floppy head cleaning kit is used to clean the read/write

heads on the floppy drive. Monitor wipes are used on the front of the monitor screen. Monitor

wipes with antistatic solution work best.

Urethane swabs are used to clean between the keys on a keyboard. If a key is sticking,

remove the keyboard before spraying or using contact cleaner on it. Touchpads normally

require no maintenance except being wiped with a dampened lint-free cloth to remove residual

finger oil.

General-purpose cleanser is used to clean the outside of the case and to clean the desktop

areas under and around the computer. Never spray or pour liquid on any computer part. Liquid

cleaners are used with soft lint-free cloths or lint-free swabs.

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