Epson EQUITY 3865X/20 PLUS User Manual page 117

Caution
If you do not correctly align the holes with the pins, you
could severely damage your computer when you push in
the connector.
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9. connect the hard disk drive cable in the same manner.
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10. Carefully lower the front of the subassembly onto the
computer. Make sure that all four tabs on the back of the
computer are inserted into the slots on the subassembly as
you lower it.
11. Guide the tabs on the front of the subassembly over the
opening in the front of the computer so the two small tabs
sit behind the opening and the large tab with the curved lip
sits over the front of the opening. If necessary, press on the
large tab until the subassembly snaps into place.