Rosewill Computer Case 422 Technical Information PDF herunterladen (Seite 78)

Electrical Fires

161

Disassembly

and Power

Phone Line Isolator

Just like AC power outlets, phone outlets can experience power fluctuations. A power surge can

enter a computer through a modem, a device used to connect a computer to a phone line. Not

only can a modem be damaged by a power surge on the phone line, but other electronics inside

the computer, such as the motherboard, can be damaged. A phone line isolator, sometimes

called a modem isolator, can be purchased at an electronics store. It provides protection

against phone line surges. No computer connected to a phone line through a modem should

be without one. Many surge protectors now come with a modem isolator built into the strip.

Figure 4.31 shows an example of a surge strip that has modem protection integrated into the

unit.

Power supplies and associated protection equipment are not exciting topics, but they are

very important to a technician. Power problems can catch you unaware. Always keep power in

your mind as a potential suspect when troubleshooting a computer.

Electrical Fires

No discussion of power is complete without a brief warning about fire. Electrical fires are

uncommon in computers, but if one occurs, a technician must know what to do. If a fire

occurs inside a computer or peripheral, unplug the equipment if possible, but do not put your-

self in harm’s way attempting to do this. Use a Type C or a Type A-B-C fire extinguisher

to put out the fire. Type C fire extinguishers are made specifically for electrical (Type C) fires.

Type A-B-C fire extinguishers can be used for Class A, Class B, and Class C fires. Class A fires

involve paper, wood, cloth, or other normal combustibles. Class B fires involve flammable

liquids and gases. It is also a good idea to have a dry chemical 20lb ABC fire extinguisher in

homes for the electronics (including computers) located there. Home computer equipment

should be listed on the home insurance policy. Figure 4.37 shows a Type A-B-C fire extin-

guisher.

Figure 4.37 Type A-B-C fire extinguisher

When a fire occurs, pull out the fire extinguisher pin. Aim the fire extinguisher nozzle at

the base (bottom) of the fire. Squeeze the fire extinguisher’s handle and move the nozzle back

and forth in a slow sweeping motion. With electrical fires, the smoke is a breathing hazard.

Burning plastics produce lethal toxic fumes. Always evacuate the people in the building and

call the fire department.

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Rosewill Computer Case 422 Technical Information Seite 78