Intel DQ45EK Product Guide - Page 52

Intel Desktop Board DQ45EK Product Guide 8. Use the arrow keys to select Clear Passwords. Press and Setup displays a pop-up screen requesting that you confirm clearing the password. Select Yes and press . Setup displays the maintenance menu again. 9. Press to save the current values and exit Setup. 10. Turn off the computer. Disconnect the computer's power cord from the AC power source. 11. Remove the computer cover. 12. To restore normal operation, place the jumper on pins 1-2 as shown below. 13. Replace the cover, plug in the computer, and turn on the computer. 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 23 on page 57 shows the location of the battery. NOTE The Intel TPM uses the onboard coin-cell battery (CR2032) to maintain its monotonic counters. One major function of the monotonic counters is for anti-replay protection of the internal Intel TPM data. If the battery is removed or exhausted, the Intel TPM data will be deleted in accordance with Trusted Computing Group guidelines. Please read the Intel TPM user guide and back-up Intel TPM keys and data before removing the battery. CAUTION Risk of explosion if the battery is replaced with an incorrect type. Batteries should be recycled where possible. Disposal of used batteries must be in accordance with local environmental regulations. 52