Technical information

Providing Power

Your computer can be operated with the AC Adapter, battery pack,

or Car Battery Adapter (available as an option).

AC Adapter

Note:

When the AC Adapter is connected,

and the remaining power of the

installed battery pack is less than a

certain amount, discharging and

then charging of the battery pack

starts automatically.

The AC Adapter is an alternating-current-to-direct-current (ac-to-dc)

converter that supplies power for the computer. The AC Adapter

also charges the battery pack when the battery pack is installed in

the computer. The input rating for the AC Adapter is 100–240 V ac,

50/60 Hz.

CAUTION:

Do not attempt to open the AC Adapter case. The AC Adapter

is permanently sealed and cannot be repaired.

Warning:

Always use the AC Adapter

certified by IBM in the country

where you will be using the

computer. Operating the

computer with an incorrect AC

Adapter can cause damage to the

battery pack and to the computer.

If you turn on the computer when the battery pack is installed, you

will hear a short beep when you connect or disconnect the AC

Adapter from the computer. This short beep means that the power

source has been changed.

When the AC Adapter cable is disconnected from the computer with

a battery pack installed, the LCD brightness decreases slightly to

conserve battery power.

18 IBM ThinkPad 755CX User's Guide