Lenovo ThinkStation 4215 Hardware Maintenance Manual page 95

This section provides instructions on how to replace the system board.
CAUTION:
The heat sink and microprocessor might be very hot. Turn off the computer and wait
three to five minutes to let the computer cool before removing the computer cover.
Note: When replacing the system board, you must order a new retention module for the new system board.
Make sure you have a retention module for the new system board before continuing this procedure.
To replace the system board, do the following:
1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Remove the computer cover. See "Removing the computer cover" on page 73.
3. Lay the computer on its side for easier access to the system board.
4. Remove all memory modules and PCI cards that are currently installed. See "Installing or replacing a
memory module" on page 78 and "Installing or replacing a PCI card" on page 75.
5. Remove the secondary hard disk drive. See "Replacing the secondary hard disk drive" on page 94.
6. Remove the heat sink and fan assembly from the failing system board. See "Replacing the heat sink and
fan assembly" on page 85.
7. Remove the microprocessor from the failing system board. See "Replacing the microprocessor" on
page 87.
8. Remove the battery from the failing system board. See "Replacing the battery" on page 84.
9. Note the location of all cable connections on the system board and disconnect all cables. See "Locating
parts on the system board" on page 71.
10. Remove the eight screws that secure the system board to the chassis, following the sequence shown
in the illustration:
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Chapter 9 Replacing FRUs
89