the structure of  Compaq Presario R3000 AC Adapter is very simple, there are still some tips should pay attention to when using.
Compaq Presario R3000 AC Adapter 135W 19V 7.1A 3-prong Description:

Input: AC100-240V (worldwide use)
Output: DC19V 7.1A
Power: 135W
Outlet: 3-prong
Connecter size:
Internal Diameter: 2.5mm
External Diameter: 5.5mm
Fit Laptop Model:Acer Travelmate 2000,HP Pavilion zd7000 Series,HP Pavilion zv5000 Series,HP Pavilion zv5400 SeriesHP Pavilion zx5000 Series and so on

1.pay attentino to some tips so that we could buy the right ones for our Compaq Presario R3000 AC Adapter erevery time.

2, Do not cover the Compaq Presario R3000 AC Adapter. Be sure the laptop AC adapter is properly ventilated when in use.

3, When not in use, remove the power plug from the power outlet.

If the wattage requirement for your laptop is lower than the 60W or 90W output of the Compaq  R3000 AC Adapter, it will not damage your laptop, your laptop will only take the amount of power it requires. I.E.

If your laptop needs 45W, then either the 60W or 90W will work OK.

If your laptop needs 80W then you will need the 90W one as the 75W one will not be powerful enough.

AC adapters with higher power ratings also give off more heat than adapters with lower power ratings. If excess heat is a consideration, an ac adapter for laptop with a higher power rating may not be suitable for the application.

Avoid exposing an Compaq Presario R3000 AC Adapter to prolonged periods of extreme heat or cold. Doing so could damage the internal circuitry and prevent it from working. Always wrap up the AC cord tightly when traveling, and avoid any contact with other metallic devices, like coins, pens or paperclips. These could accidentally short-circuit the adapter by causing an connection of the positive an negative terminals, for example, when bouncing around in a bag.

Visit udtke.com,Udtek.com delivers high quality laptop batteries, laptop AC adapters, laptop keyboards, LCD adapters, DVDRW drivers, laptop car chargers and more. Our unique product lines of over 1000 diverse accessory power products and replacement batteries and adapters provide our customers with an extensive selection of the best quality products available.