Lenovo C40 Series Hardware Maintenance Manual page 48

Step 5. Remove the foot cover. Refer to "Removing the foot cover".
Step 6. Remove the stand holder. Refer to "Removing the stand holder".
Step 7. Remove the middle cover. Refer to "Removing the middle cover".
Step 8. Remove the optical drive. Refer to "Replacing the optical drive".
Step 9. Remove the six screws that secure the rear deco to the chassis.
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Lenovo C40 Series All-In-One Computer Hardware Maintenance Manual