Installing and Replacing Desktop Board Components
57
Figure 27. Location of the Clear CMOS Memory Jumper Block
Table 16. Clear CMOS Jumper Settings
Jumper Mode Description
None Normal (default) The BIOS uses the current contents of the
CMOS memory.
Installed Clear The CMOS memory is erased.
Replacing the Battery
A coin-cell battery (CR2032) powers the real-time clock and CMOS memory. When
the computer is not plugged into a wall socket, the battery has an estimated life of
three years. When the computer is plugged in, the standby current from the power
supply extends the life of the battery. The clock is accurate to ± 13 minutes/year at
25 ºC with 3.3 VSB applied.
When the voltage drops below a certain level, the BIOS Setup program settings stored
in CMOS RAM (for example, the date and time) might not be accurate. Replace the
battery with an equivalent one. Figure 28 on page 62 shows the location of the
battery.
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