The laptop ac adapter is used to recharge the battery in a notebook and to provide dependable power for operating the notebook for long periods of time. If an power adapter for Acer Travelmate fails it will not recharge the battery and it will not provide power to operate the laptop without a battery. You can test it first to see if it is defective. If it is time to get a new adapter for the travelmate computer, here is the basics you need to check when choosing a new one:
Output Specs Voltage and milli-Amps(current)
Connector plug size/Output Polarity
Step 1. Determine the desired output specs of the AC adapter. For Travelmate 4000, the output current is 3.42A and output voltage is 19V. This can usually be found on the old adapter, the electronic device, or the instruction manual of the electronic device. When selecting an adapter, you will want to match the voltage & current as closely as possible. If an exact match is not available, as the excess voltage could damage the electronic device, it is better to to choose a new adapter having the same voltage and higher current than the specifications require. This will work too and provide more power to your laptop.
Step 2. Decide if the adapter should be regulated or unregulated. A regulated AC adapter guarantees that the output voltage will always be constant. Therefore, regulated AC adapters are also generally more expensive than unregulated ones. It is ok to substitute a regulated adapter for an unregulated one (the downside being added cost), however, Do Not use an unregulated supply in place of a regulated one!
Step 3. Check the polarity of the Acer TravelMate 4000 ac adapter. Polarity determines the direction that current flows; if the current from the adapter flows the wrong way for the intended electronic device, the device may be damaged. It is important to be sure that the polarity of the adapter and the laptop computer match. NEVER choose an adapter with the wrong polarity as this can damage the equipment.
Step 4. Determine the size of the adapter plug. Plug sizes are normally measured in millimeters(mm). The plug size of Acer TravelMate 4000 is 1.7mm x 5.5mm. If the plug size is the only thing wrong with an adapter, meaning that its voltage and current ratings, whether it is regulated or unregulated, and its polarity all match, it is possible to splice a new plug onto the adapter, as many electronics stores do sell just the plug in different sizes. However, you must make sure that the new plug maintains the same polarity as the old one, meaning that the wire that connected to the outside surface of the old plug still connects to the outside of the new plug, and that the wire that connected to the inside surface of the old plug still connects to the inside surface of the new plug.
Step 5. Read the labels on your original Acer TravelMate 4000 power pack before choosing a new one. Buy a new power cord that meets all of the requirements mentioned above.
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