Lenovo C40-05 Lenovo C40 Series All-In-One Computer Hardware Maintenance Manua - Page 42
Replacing the system fan, Step 2. Unplug all power cords from electrical outlets.
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Step 6. Step 7. Step 8. Remove the stand holder. Refer to "Removing the stand holder". Remove the middle cover. Refer to "Removing the middle cover". Remove the five screws that secure the EMI cover to the chassis, and then lift it up. Step 9. To reattach the EMI cover: a. Line up the holes on the EMI cover with mounting holes on the chassis, then place EMI cover back into position. b. Secure the EMI cover to the chassis with five screws. Step 10. Reattach the middle cover, stand holder, foot cover and stand base. Replacing the system fan Note: Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover. Note: It may be helpful to place the computer face-down on a soft flat surface for this procedure. Lenovo recommends that you use a blanket, towel, or other soft cloth to protect the computer screen from scratches or other damage. To replace the system fan Step 1. Step 2. Step 3. Step 4. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operating system, and turn off the computer and all attached devices. Unplug all power cords from electrical outlets. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O) cables, and any other cables that are connected to the computer. Refer to "Left and right view" and "Rear view" for help with locating the various connectors. Remove the stand base. Refer to "Removing the stand base". 36 Lenovo C40 Series All-In-One Computer Hardware Maintenance Manual