Epson WorkForce Pro WF-C8690 A3 Color MFP with PCL/PostScript - Manual (Page 41)

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You see a screen like this:
6. Use the displayed keyboard to enter a password and select OK .
7. Enter your password again to confirm.
Note: Keep a copy of your password in a safe place.
8. Select OK .
9. Turn Lock Setting on.
When the control panel is locked, you must enter the password to access any of the locked settings.
Note: If you forget your password, contact Epson for assistance.
Entering Characters on the LCD Screen
Using Presets
Parent topic: Using the Control Panel
Related tasks
Setting User Feature Restrictions (Access Control)