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VAIO MicroTower System Reference
18
Configuring the System Board
The system board contains two configuration jumpers that provide three
modes of operation: Normal mode, Clear Password mode, and BIOS
Recovery mode.
Normal mode allows normal access to the BIOS Setup Utility. The Central
Processing Unit (CPU) input clock is forced to remain at 66 MHz (fast
mode), and the Basic Input/Output System (BIOS) uses the User CMOS
settings (as opposed to the System CMOS settings). The CMOS and
NVRAM settings are only cleared if the checksum test returns false.
Access to specific setup fields is controlled by a supervisor password or
user password.
Clear Password mode removes the password that is stored in CMOS.
BIOS Recovery mode sets the CPU input clock to 66 MHz (fast mode) and
attempts to perform a blind BIOS update. If the recovery fails, beep codes
alert you to the failure and the system waits for the insertion of a boot
diskette in the A drive. No video is enabled at this point.
WARNING
1
Remove the side panel (see “Removing the Side Panel” on page 22).
2
Remove the bottom panel (see “Removing the Bottom Panel” on
page 23).
✍
The configuration jumpers should never need changing unless otherwise directed by a
technical support or service technician.
Before opening the system, save any open files, exit Windows, turn off the power
of the computer and all attached peripherals, and unplug the power cord.
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