Modifying The I/O Riser Board; Replacing The Real-Time Clock Battery - NEC EXPRESS5800/180Ra-7 User Manual

Modifying the I/O Riser Board

The following subsection provides procedures for upgrading the I/O riser board.

" Replacing the real-time clock battery.

Note:
boards and other components; place them on an antistatic
surface. Wear an antistatic wrist strap attached to chassis
ground.
Replacing the 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 available through many vendors. It is
located on your I/O riser board (see Figure 4-35). Notice the plus (+) sign on the
battery. The sign assists in correctly positioning the battery on the I/O riser
board. Contact your sales representative or dealer for a list of approved devices.
Figure 4-35. Location of the Real-Time Clock Battery
Danger of explosion if the 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.
Electrostatic discharge (ESD) can damage add-in
! CAUTION
Upgrading Your System 4-31