NEC HX4000, User Manual

Page: 117 / 210

5-28
Upgrades and Options
Real-time Clock Battery
You may need to replace the real-time clock (RTC)
battery because of its battery life span. The battery
powers the clock in the absence of power. When the
battery starts to weaken, it loses voltage, and the
system settings stored in CMOS RAM (for example, the
date and time) may be wrong.
The battery (Vendor Part No. CR2450) is a commodity
part available through many vendors. Its located on
your system board as shown in Figure 5-11. Notice the
plus (+) sign on the battery. This sign will assist you in
correctly positioning the battery on the system board.
Contact your sales representative or dealer for a list of
approved devices.
CAUTION: Danger of explosion if battery is incorrectly
replaced. Replace only with same or equivalent type
recommended by manufacturer. Dispose of lithium
batteries as required by local ordinance or as normal
waste if no local ordinance exists. Do not expose the
component to excessive heat or fire. Keep all batteries
away from children.
Figure 5-11. Location of the Real-Time Clock Battery