Lenovo C40 Series Hardware Maintenance Manual page 44

Step 1. 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.
Step 2. Unplug all power cords from electrical outlets.
Step 3. 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.
Step 4. Remove the stand base. Refer to "Removing the stand base".
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 EMI cover. Refer to "Removing the EMI cover".
Step 9. Remove the sealing tape between the system fan and heat-sink.
Step 10. Remove the screws that secure the heat-sink to the motherboard and chassis.
Step 11. Slide then lift up the heat-sink to remove it.
Attention: Place the heat-sink upside down on a flat surface to prevent thermal grease from contaminating
other components.
Attention: Use an alcohol pad to wipe the thermal grease off the CPU.
Step 12. To install the new heat-sink:
a. Line up the new heat-sink with mounting holes on the motherboard, then place it into position.
b. Follow the numbers printed on the new heat-sink to secure it in order using the screws.
c. Use the sealing tape to seal the gap in-between the system fan and heat-sink.
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Lenovo C40 Series All-In-One Computer Hardware Maintenance Manual