Lenovo N 500 Service Manual

							1080 Heat sink assembly 
For access, remove these FRUs in order: 
v   
 “1010 Battery pack” on page 54 
v 
 
 “1050 Thermal slot cover” on page 59 
v 
 
 “1070 Fan assembly” on page 61
 Table 17. Removal steps of heat sink assembly 
Note: Step 
5 is only for the models with discrete graphics chip. For the 
models with integrated graphics chip, skip the step 
5. 
1
2
34
5
 
Step Screw (quantity) Color Torque 

1 to 

4 
M2.5 × 5 mm with spring, nylon-coated (4) Silver 2.0 Nm
(2.5
 kgfcm) 

5 M2.5 × 5 mm, wafer-head, nylon-coated (3) Silver 2.0 Nm
(2.5
 kgfcm) 
 
Lenovo 3000 N500 63 
						

							Table 17. Removal steps of heat sink assembly (continued) 
Attention: Do not handle the heat sink assembly roughly. Improper handling of 
the heat sink assembly can cause distortion or deformation and imperfect 
contact with components. 
6
 
When installing: Before you attach the fan assembly to the computer, apply 
thermal grease, at an amount of 0.2 grams, on the part marked 
a as in the 
following figure. Either too much or too less application of grease can cause a 
thermal problem due to imperfect contact with a component. Yo u also need to 
peel the thin film off from the rubber 
b. In models with the discrete graphics 
chip, there is an additional thermal rubber 
c whose film to be peeled off. 
a
bc
 
 
 
 
64 Lenovo 3000 N500 Hardware Maintenance Manual 
						

							1090 Wireless LAN card slot cover and PCI Express Mini Card 
for wireless LAN 
For access, remove this FRU in order: 
v   
 “1010 Battery pack” on page 54
 Table 18. Removal steps of Wireless LAN card slot cover and PCI Express Mini Card for 
wireless LAN 
Note: Loosen the screws 
1, but do not remove them. 
1 
In step 
3, unplug the jacks by using the removal tool antenna RF connector 
(P/N: 08K7159) or pick the connectors with your fingers and gently unplug 
them in direction of the arrow. 
Note: Some models might have three antenna cables in step 
3.
4
4
33
 
Step Screw (quantity) Color Torque 

4 M2 × 3 mm, wafer-head, nylon-coated (2) Black 1.5 Nm
(2.0
 kgfcm) 
 
Lenovo 3000 N500 65 
						

							Table 18. Removal steps of Wireless LAN card slot cover and PCI Express Mini Card for 
wireless LAN (continued) 
5
 
When installing: 
v   
 In models with wireless LAN card that has two antenna connectors, plug the 
gray cable into the jack labeled MAIN, and the black cable into the jack 
labeled AUX on the card. If the computer you are servicing has three cables, 
put the white cable in the cable holder. 
v 
 
 In models with wireless LAN card that has three antenna connectors, plug the 
gray cable (MAIN) into the jack labeled TR1, the white cable (3rd) into jack 
labeled R0 or TR3, and the black cable (AUX) into jack labeled TR2 on the 
card. 
 
 
66 Lenovo 3000 N500 Hardware Maintenance Manual 
						

							1100 CPU 
For access, remove these FRUs in order: 
v   
 “1010 Battery pack” on page 54 
v 
 
 “1050 Thermal slot cover” on page 59 
v 
 
 “1070 Fan assembly” on page 61 
v 
 
 “1080 Heat sink assembly” on page 63
Attention:
   CPU is extremely sensitive. When you service the CPU, avoid any 
kind of rough handling.
 Table 19. Removal steps of CPU 
Rotate the head of the screw in the direction shown by arrow 
1 to release the 
lock; then remove the CPU. 
a
b
1
2
 
When installing: Place the CPU on the CPU socket 
a, and then rotate the head 
of the screw in the direction shown by arrow 
b to secure the CPU. 
 
 
Lenovo 3000 N500 67 
						

							111 0 Keyboard cover and power board 
For access, remove this FRU in order: 
v   
 “1010 Battery pack” on page 54
Note:
 Power board is attached to the keyboard cover.
 Table 20. Removal steps of keyboard cover and power board 
1111 
Step Screw (quantity) Color Torque 

1 M2 × 2.5 mm, wafer-head, nylon-coated (4) Black 1.0 Nm
(1.5
 kgfcm) 
3
3
3
3
3
2
 
 
68 Lenovo 3000 N500 Hardware Maintenance Manual 
						

							Table 20. Removal steps of keyboard cover and power board (continued) 
4
6
5
5
 
When installing: Make sure that the FPC connector is attached firmly. 
7
7
8
8
9
10
 
When installing: Make sure that the FPC connector is attached firmly. 
Step Screw (quantity) Color Torque 

7 M2 × 3 mm, wafer-head, nylon-coated (2) Silver 1.5 Nm
(2.0
 kgfcm) 
 
 
 
Lenovo 3000 N500 69 
						

							1120 Bluetooth daughter card (BDC-2.1) 
For access, remove these FRUs in order: 
v   
 “1010 Battery pack” on page 54 
v 
 
 “ 111 0 Keyboard cover and power board” on page 68
 Table 21. Removal steps of BDC-2.1 
21
3
 
Step Screw (quantity) Color Torque 

1 M2 × 3 mm, wafer-head, nylon-coated (1) Silver 1.0 Nm
(1.5
 kgfcm) 
When installing: Make sure that connector is attached firmly. 
 
 
70 Lenovo 3000 N500 Hardware Maintenance Manual 
						

							1130 Keyboard 
For access, remove these FRUs in order: 
v   
 “1010 Battery pack” on page 54 
v 
 
 “ 111 0 Keyboard cover and power board” on page 68
 Table 22. Removal steps of keyboard 
1
1
 
Step Screw (quantity) Color Torque 

1 M2 × 2.5 mm, wafer-head, nylon-coated (1) Black 1.0 Nm
(1.5
 kgfcm) 
 
Lenovo 3000 N500 71 
						

							Table 22. Removal steps of keyboard (continued) 
Lift the keyboard a little in the direction shown by arrow 
2, and then detach 
the connector 
3. 
2
3
34
 
When installing: Make sure that the FPC connector is attached firmly. 
 
 
72 Lenovo 3000 N500 Hardware Maintenance Manual