Hitachi 2730P manual Unknown user password, Material Use Voltage protection level

Removal and replacement procedures

■Static awareness labels

■Material-handling packages

■Nonconductive plastic bags, tubes, or boxes

■Metal tote boxes

■Electrostatic voltage levels and protective materials

The following table lists the shielding protection provided by antistatic bags and floor mats.

Material	Use	Voltage protection level
Antistatic plastic	Bags	1,500 V
Carbon-loaded plastic	Floor mats	7,500 V
Metallized laminate	Floor mats	5,000 V

Unknown user password

If the computer you are servicing has an unknown user password, follow these steps to clear the password:

✎These steps also clear CMOS.

1.Shut down the computer. If you are unsure whether the computer is off or in Hibernation, 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 4-8).

5.Remove the real-time clock (RTC) battery (see “RTC battery” on page 4-23).

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.

Maintenance and Service Guide 4–5