Acer Aspire 5739G Acer Aspire 5739G Series Service Guide - Page 175

Clearing Password Check and BIOS Recovery This section provide you the standard operating procedures of clearing password and BIOS recovery for Aspire 5739. Aspire 5739 provides one Hardware Open Gap on main board for clearing password check, and one Hotkey for enabling BIOS Recovery. Clearing Password Check Hardware Open Gap Description Item Description G1/G2 Clear CMOS Jumper Location Adjacent to RTC Battery Steps for Clearing BIOS Password Check If users set a BIOS Password (Supervisor Password and/or User Password) for security reasons, the BIOS will prompt for a password during system POST or when systems enter to BIOS Setup menu. However, if it is necessary to bypass the password check, users need to short the HW Gap to clear the password by performing the following procedure: 1. Power off the system, and unplug the AC and Battery from the machine. 2. Open the Hard Drive and RAM doors. 3. Remove the Hard drive. 4. Find the appropriate HW Gap on M/B as shown in the picture. • G1 is the RTC Reset. When asserted, this signal resets register bits in the RTC well. Unless the CMOS is being cleared (only to be done in the G3 power state), the RTCRST# input must always be high when all other RTC power planes are on. In the case where the RTC Battery is dead or missing on the platform, the RTCRST# pin must rise before the RSMRST# pin. • G2 is the Secondary RTC Reset. This signal resets the manageablility register bits in the RTC well when the TRTC battery is removed. The SRTCRST# input must always be high when all other RTC power planes are on. In the case where the RTC Battery is dead or missing on the platform, the SRTCRST# pin must rise before the RSMRST# pin. 5. Use an electric conductivity tool to short the two points of the desired HW Gap. 6. Plug in AC, keeping the HW Gap shorted, and press Power Button to power on the system till BIOS POST finish. Then remove the tool from the HW Gap. Chapter 3 165