Lenovo ThinkStation D20 - Manual (Page 39)

8. Position the new heat sink and fan assembly on the microprocessor so that the four screws are aligned
with the holes on the system board.
9. Follow this sequence to install the four screws to secure the heat sink and fan assembly:
a. Partially tighten screw 1 , then fully tighten screw 2 , and then fully tighten screw 1 .
b. Partially tighten screw 3 , then fully tighten screw 4 , and then fully tighten screw 3 .
10. Reconnect the heat sink fan assembly cable to the system board.
11. Go to Chapter 4 “Completing the parts replacement” on page 45.
Replacing a hard disk drive
Attention: Do not open your computer or attempt any repair before reading and understanding the “Important safety
information” in the ThinkStation Safety and Warranty Guide that came with your computer. To obtain a copy of the
ThinkStation Safety and Warranty Guide, go to:
http://support.lenovo.com
This section provides instructions on how to replace the hard disk drive.
Important: When you receive a new hard disk drive, you also receive a set of Product Recovery discs.
The set of Product Recovery discs will enable you to restore the contents of the hard disk drive to the
factory-installed state. For more information on recovering factory-installed software, refer to “Recovering
software” in your ThinkStation User Guide.
Note: You can install a combination of SATA and SAS hard disk drives within the same computer. However,
SATA and SAS hard disk drives cannot be installed within the same RAID array.
To replace a hard disk drive:
1. Remove the computer cover. See “Removing the computer cover” on page 11.
2. Locate the hard disk drive. See “Locating components” on page 7.
3. Disconnect the signal and power cables from the hard disk drive.
Chapter 3 . Installing options and replacing hardware 33