Lenovo 3000 J Series Manual

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. 
4. 
 
 Remove the two thumb screws at the rear of the left-side cover and slide the 
cover to the rear to remove. 
 
 
   
5. 
 
 If necessary, remove the right-side cover in the same manner.
 
 
Chapter 8. Replacing FRUs (Types 7387, 7388, 7389, 7393, 7394, and 7395) 85 

Locations 
The following illustration will help you locate the major FRUs in the computer. 
   
 
 

1 Heat sink and fan 
6 Front panel card 

2 Microprocessor 
7 Hard disk drive 

3 Memory modules 
8 System board 

4 Optical drive 
9 System fan 

5 Diskette drive 
10 Power supply 
 
 
86 Lenovo 3000 J Series 

Identifying parts on the system board 
There are different system boards depending on the machine type. 
Machine Types 7387, 7388, and 7389 
   
 
 

1 Microprocessor fan 
connector 

11 Front panel (power switch/LED) connector 

2 Microprocessor and heat 
sink 

12 S ATA IDE connectors (2) 

3 Memory connector 1 
13 Front USB connectors (2) 

4 Memory connector 2 
14 Serial (COM2 connector) 

5 Clear CMOS/Recovery 
jumper 

15 PCI adapter connectors 

6 Power supply connector 
16 Front audio...

Machine Types 7393, 7394, and 7395 
   
 
 

1 Microprocessor and heat 
sink 

11 Front USB connectors (2) 

2 Microprocessor fan 
connector 

12 Serial (COM2) connector 

3 Memory connector 1 
13 Front audio connectors 

4 Memory connector 2 
14 PCI adapter connectors (2) 

5 Power connector 
15 PCI Express x1 graphics adapter connector 

6 Diskette drive connector 
16 CMOS battery 

7 IDE connector 
17 PCI Express x16 graphics adapter connector 

8 S ATA IDE connectors (2) 
18 System...

Removing and replacing the front bezel 
The front bezel must be removed to replace some FRUs. 
1.   
 Remove both the left-side and right-side covers. See “Removing the covers” on 
page 84. 
2. 
 
 Disconnect the cable for the power switch/LED assembly from the system 
board. See “Identifying parts on the system board” on page 87 for the 
connector location. 
3. 
 
 Remove the screws that secure the bezel. There are two on each side.
 
 
   
4. 
 
 There are three plastic tabs on each side of the bezel....

Replacing a memory module 
1.   
 Remove the left-side cover. See “Removing the covers” on page 84. 
2. 
 
 Locate the memory connectors. See “Identifying parts on the system board” on 
page 87. 
3. 
 
 Open the retaining clips and remove the failing memory module. 
 
 
   
4. 
 
 Make sure the notch 
1 on the new memory module is aligned correctly with 
the connector key 
2 on the socket. Insert the memory module straight down 
into the connector until it snaps into position and the retaining clips...

Replacing a PCI adapter 
1.   
 Remove the left-side cover. See “Removing the covers” on page 84. 
2. 
 
 Remove the screw securing the adapter being replaced. 
3. 
 
 Pull the adapter straight out of the PCI connector. 
4. 
 
 Remove the new adapter from its static-protective package. 
5. 
 
 Install the new adapter into the appropriate PCI connector. 
 
 
   
6. 
 
 Install the screw to secure the new adapter. 
7. 
 
 Go to “Completing the FRU replacement” on page 112.
 
 
Chapter 8. Replacing FRUs...

Replacing the CMOS battery 
If the CMOS battery fails, the date, time, and configuration information (including 
passwords) are lost. An error message is displayed when you turn on the 
computer. 
1.   
 Refer to “Safety notices (multi-lingual translations)” on page 7 for information 
about replacing and disposing of the battery. 
2. 
 
 Turn off the computer and all attached devices. 
3. 
 
 Remove the left-side cover. See “Removing the covers” on page 84. 
4. 
 
 Locate the battery. See “Identifying...

Replacing the power supply 
 
Attention 
Never remove the cover on a power supply or any part that has the 
following label attached. 
   
 
Hazardous voltage, current, and energy levels are present inside any 
component that has this label attached. There are no servicable parts inside 
these components. 
1.   
 Remove the left-side cover. See “Removing the covers” on page 84. 
2. 
 
 Disconnect all power supply cables from the drives. 
3. 
 
 Disconnect all power supply cables from the system board....

Replacing the system board (Types 7393, 7394, and 7395) 
Note:   When replacing the system board a new retention module for the 
microprocessor heat sink is required. Make sure you have a new retention 
module before beginning this procedure. 
 
1.   
 Remove both side covers. See “Removing the covers” on page 84. 
 
2.   
 Lay the computer on the right side to make the system board accessible. 
 
3.   
 Remove any adapter cards installed in the PCI connectors. See “Replacing a 
PCI adapter” on page 91....