Lenovo IdeaCentre B305 - Manual (Page 43)

Chapter 8. Replacing hardware
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5. Disconnect the motherboard fan power cable.
Replacing the heatsink
To remove the heatsink:
1. Removing the computer stand. Refer to “Removing the computer stand”.
2. Removing the computer cover. Refer to “Removing the computer
cover”.
3. Removing the motherboard cover. Refer to “Removing the
motherboard cover”.
4. Remove the 4 screws that secure the heatsink to the chassis.