Modifying the System Board

The following sections provide procedures for upgrading and configuring the system board in your system. Topics covered include:

!Replacing the real-time clock battery

!Removing and installing a processor

!Installing or removing DIMMs.

!CAUTION

Electrostatic discharge (ESD) can damage add-in boards and other components; place them on an antistatic surface. Modify the system board only at an ESD workstation. Otherwise, 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 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 3V battery (Vendor Part #CR2032) is a commodity part available through many vendors. It is located on your system board (See Figure 4-5). 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

!CAUTION

Observe static precautions. Use an antistatic wrist strap.

4-10 Disassembly and Reassembly

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NEC 120Lg manual Modifying the System Board, Replacing the Real-time Clock Battery