Sony DVS-9000 User Manual page 299

Releasing the lock
When a lock is already applied, use the following procedure.
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To change the lock password
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To select an opened setup menu for locking
With the menu you want to lock open, press Lock Item Select button at the
lower left.
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Setup for the Whole System
In the System >Maintenance >Setup Operation Lock menu, press [Lock].
A keyboard window appears.
Enter the password.
If the password is correct, the lock is released, and the padlock icon
disappears.
In the System >Maintenance >Setup Operation Lock menu, press [Change
Password].
A confirmation message appears.
Press [Yes].
A keyboard window labeled "Old Password" appears.
Enter the old password, and press [Enter].
If the password is correct, a keyboard window labeled "New Password"
appears.
Enter the new password, and press [Enter].
Enter the new password once more, for confirmation.
This sets the new password.