Lenovo J SERIES 3000 - Manual (Page 108)

7. At the rear of the chassis, remove the three screws that secure the power supply. Also remove the
screw that secures the power supply at the front.
8. Lift the power supply out of the chassis.
9. Install the new power supply and install the three screws that secure the power supply at the rear of the
chassis and install the screw that secures the power supply at the front.
10. Position the system board so that the screws holes are aligned and install the system board screws.
11. Install the hard disk drive. Make sure to route the power supply cable for the system board underneath
the hard disk drive. See “Replacing the hard disk drive” on page 114.
12. Reconnect all other power supply cables to the system board and the drives. See “Identifying parts on
the system board” on page 95. Make sure the cables are correctly routed.
13. Replace the drive bay assembly. See “Removing and replacing the drive bay assembly” on page 97.
14. Go to “Completing the FRU replacement” on page 117.
Replacing the system board (Types 7396, 7397, and 7398)
Note: When replacing the system board, a new retention bracket for the microprocessor heat sink is
required. Make sure you have a new retention bracket before beginning this procedure.
1. Remove the cover. See “Removing the cover” on page 94
2. Lift the fan duct off the heat sink fan.
3. Remove any adapter cards installed in the PCI connectors. See “Replacing a PCI adapter” on page 99.
4. Remove the drive bay assembly. See “Removing and replacing the drive bay assembly” on page 97.
5. Take note of the location of all cable connections on the system board and disconnect all cables. See
“Identifying parts on the system board” on page 95.
6. Remove the hard disk drive. See “Replacing the hard disk drive” on page 114.
7. Remove the screws that secure the system board to the chassis.
8. Lift the system board out of the chassis.
9. Remove the memory modules from the failing system board and install them in the same location on
the new system board.
10. Disconnect the heat sink and fan assembly cable from the system board. See “Identifying parts on the
system board” on page 95 .
11. Remove the four screws 1 securing the heat sink and fan assembly to the system board.
102 Hardware Maintenance Manual Lenovo 3000 J Series