Lenovo ThinkPad 390 Hardware Maintenance Manual (March 1999): ThinkPad 390E on - Page 31
The Supervisor password and Hard Disk password, drive data from unauthorized access. No overriding - thinkpad 390e ac adapter
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2. Remove the battery pack and AC Adapter. 3. Remove the backup battery (RTC) for 20 minutes or use a screwdriver to touch the backup battery (RTC) for 1 second. 4. Put back the backup battery (RTC). 5. Power on the computer and wait until POST ends. 6. Verify that the password prompt does not appear. Supervisor and HDD passwords: The Supervisor password and Hard Disk password (Hard Disk1 and Hard Disk2) are security features that are used to protect the system and the hard disk drive data from unauthorized access. No overriding capability is provided, so it cannot be replaced if they are forgotten. If the customer forgets the Supervisor password, the system board must be replaced. If the customer forgets the Hard Disk password, the hard disk drive must be replaced. ThinkPad 390E 21