FT3000 (N440BX motherboard) - Draining CMOS
How to Replace the Battery
When your computer is turned off, a lithium battery
keeps the time-of-day clock and the values in CMOS RAM current.
The battery should last between five and seven years. Replace the battery only with a
direct equivalent and ensure the correct polarity.
Danger of explosion if the battery is incorrectly replaced. Replace only with the same
or equivalent type recommended by your Mitsubishi Electric supplier. Discard used
batteries according to the battery manufacturers instructions.
- Observe the precautions in Safety and Regulatory Notices in the
- Turn off the computer, disconnect the computers power cord, and
disconnect all external peripherals.
- Remove the computer cover.
- Locate the battery on the motherboard using the diagram at the beginning
of Motherboard Components.
- With a small non-metallic tool, gently pull the
retaining clip from the battery, and it will pop up for easy removal. Note the orientation
of the "+" and "-" on the battery.
You must not use a metal or other conductive implement to remove the battery. If a
short-circuit is accidentally made between the batterys positive and negative
terminals, the battery may explode.
- Install the new battery in the socket, orienting the "+" and
"-" correctly and press it home. Make sure the retaining clip is holding the
battery in the socket correctly and firmly.
- Replace the computer cover.
You will need to enter the BIOS and Setup utility to
check your system settings. See the Configuration chapter of the
Owner's Handbook for details.