Epson AcuLaser C4000 Owner's Manual page 238

6. Align the three screw holes on the Hard Disk Drive with the
screw holes on the circuit board. Secure it by tightening the
three screws provided.
Note:
Be careful not to damage the cable when tightening the screws.
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Using Options
Caution:
Do not remove any modules from the circuit board.
Otherwise, the printer will not work.