HP Compaq 6720t, Руководство по техническому обслуживанию и ремонту

Страница: 34 / 114

Unknown user password
If the computer you are servicing has an unknown user password, follow these steps to clear the password:
NOTE: These steps also clear CMOS.
1
. Shut down the computer. If you are unsure whether the computer is off, turn the computer on, and then
shut it down through the operating system.
2
. Disconnect all external devices connected to the computer.
3
. Disconnect the power from the computer by first unplugging the power cord from the AC outlet and
then unplugging the AC adapter from the computer.
4
.
Remove the battery (see Battery on page 29 ).
5
. Remove the real-time clock (RTC) battery (see System board and system board frame
on page 52 ).
6
. Wait approximately 5 minutes.
7
. Replace the RTC battery and reassemble the computer.
8
. Connect AC power to the computer. Do not reinsert any batteries at this time.
9
. Turn on the computer.
All passwords and all CMOS settings have been cleared.
26 Chapter
4
Removal and replacement procedures