Epson WorkForce Pro WF-C8690 A3 Color MFP with PCL/PostScript - Manual (Page 50)

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You see a screen like this:
5. Scroll down and select PC Connection via USB .
6. Select Disable .
Note: You must restart the product for the change to take effect.
Parent topic: Using the Control Panel
Product Parts Locations
See these sections to identify the parts on your product.
Product Parts - Front
Product Parts - Inside
Product Parts - Back
Parent topic: Product Basics