Epson GT-30000 - Manual (Page 21)

Setting Up Your Scanner
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4. Slide the ADF onto the scanner, lining up the screws with the holes as shown.
5. Twist the knobs onto the ends of the screws and tighten them using the
screwdriver tool.
6. Attach the ADF’s connector to the scanner’s option interface. Then tighten the
connector screws.
7. Close the ADF.