AC adapters come in many varieties. While they're reliable, you may have one fail on you. If you can't find an original replacement, hardware and electronics stores carry "universal" adapters that can run many different kinds of gadgets. Before you use one, you need to determine the polarity of the original. The polarity, voltage, and current are usually marked on the body of the adapter. If not, you can use a multimeter to find its polarity.
Unplug the laptop AC adapter from the wall socket and any devices it might be powering.
Examine the body of the adapter. Many have a label or other markings that indicate the polarity of the plug that goes into your electronics. While styles vary widely, many use a round plug with an inner (tip) and outer (ring) conductor. If the label shows the adapter's polarity, compare the sketch on the label to the plug's configuration. If the adapter does not show this, or if the label's missing, proceed to the next step.
Plug the adapter into an AC outlet. Set your multimeter to read DC volts. Carefully touch the meter's red (positive) probe to the inside conductor of the plug that connects to your electronic device. If it's hollow, you may be able to slide the probe in. Carefully touch the black (negative) probe to the plug's outside (ring) conductor.
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Read the voltage on the meter. If it indicates a positive voltage value, the plug's polarity matches the polarity of the meter probes---negative on the outside, positive on the inside. If the meter shows a negative value, the probes are reversed, so the plug's outside is positive and its inside is negative. Remove the probes from the plug and turn the meter off.
Your laptop adapter is an essential part of your unit, as it keeps your computer operating, in addition to recharging the battery. Although this vital part of the computer eventually wears out and requires replacement, you can prolong its life--which is important, as adapters can be expensive to replace.
HP COMPAQ Business Notebook NC6400 Laptop AC Adapter
All adapters are not created equally. Check the voltage on your laptop. Then compare that to the voltage of the adapter cord you in which you are interested. If the voltage is too low, it will not power your computer, or it will short-circuit. This is especially true if you take your unit outside the country. Most outlets that power laptops outside the United States take 100 to 240 volts, as the website states.
The power brick--which, according to the G-batteryshop website, is the black box in the center of your adapter--is a sensitive piece of equipment. It is a significant part of your adapter, for it is the part that receives the electrical charge and lets you know that your unit is on. Protect it by not jarring it or dropping it.
If hard objects, such as books or your laptop case, are lying on the adapter cord--the effect is similar to that of a bent water hose, according to the G-batteryshop website. It could choke the flow of current in your cord, and keep your computer from powering on. Furthermore, as the Toshiba website indicates, you must keep your adapter cord straight as possible at all times to avoid damage to the wires inside.
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Keep the cord in a cool place. The Toshiba website says to avoid placing it near heat sources such as electric blankets or heaters. Heat can travel into these sources, damaging the sensitive wiring in the adapter cord.
As the Toshiba website points out, do not run your cord through any pinch points. This may include a door, a window or between a desk and a wall. This may not only disrupt the flow of current, but also damage the wiring inside the adapter.
Never pull directly on the cord to unplug your unit. As the Toshiba website points out, pulling on the cord can not only possibly damage your adapter, but also could bring irreparable damage to you. You could incur electric shock, or even a house fire, by improperly unplugging your adapter. To prevent this, always grab hold of the plug itself.
Replacement For Dell INSPIRON 300M Laptop AC Adapter
