Lenovo N 500 Service Manual

							Removing and replacing a FRU 
This section presents directions and drawings for use in removing and replacing a 
FRU. Be sure to observe the following general rules: 
1.   
 Do not try to service any computer unless you have been trained and certified. 
An untrained person runs the risk of damaging parts. 
2. 
 
 Before replacing any FRU, review “FRU replacement notices” on page 49. 
3. 
 
 Begin by removing any FRUs that have to be removed before the failing FRU. 
Any such FRUs are listed at the top of the page. Remove them in the order in 
which they are listed. 
4. 
 
 Follow the correct sequence in the steps for removing the FRU, as given in the 
drawings by the numbers in square callouts. 
5. 
 
 When turning a screw to replace a FRU, turn it in the direction as given by the 
arrow in the drawing. 
6. 
 
 When removing the FRU, move it in the direction as given by the arrow in the 
drawing. 
7. 
 
 To put the new FRU in place, reverse the removal procedure and follow any 
notes that pertain to replacement. For information about connecting and 
arranging internal cables, see “Locations” on page 93. 
8. 
 
 When replacing a FRU, use the correct screw as shown in the procedures.
DANGER 
 
 
 
 
Attention:   After replacing a FRU, do not turn on the computer until you have 
made sure that all screws, springs, and other small parts are in place and none are 
loose inside the computer. Verify this by shaking the computer gently and listening 
for rattling sounds. Metallic parts or metal flakes can cause electrical short circuits.
 Attention: 
 The system board is sensitive to, and can be damaged by, electrostatic 
discharge. Before touching it, establish personal grounding by touching a ground 
point with one hand or by using an electrostatic discharge (ESD) strap (P/N 
6405959).
  
Before removing any FRU, turn off the computer, unplug all power cords from 
electrical outlets, remove the battery pack, and then disconnect any 
interconnecting cables. 
 
Lenovo 3000 N500 53 
						

							1010 Battery pack 
DANGER   
 
 
 
Table 10. Removal steps of battery pack 
Unlock the battery release lever 
1. Holding the battery release lever in the 
unlocked position 
2, remove the battery pack in the direction shown by arrow 

3. 
3
2
2
1
1
 
When installing: Install the battery pack along the slide rails of the slot. Then 
make sure that the battery release lever is in the locked position. 
  
Use only the battery specified in the parts list for your computer. Any other 
battery could ignite or explode. 
 
54 Lenovo 3000 N500 Hardware Maintenance Manual 
						

							1020 Dummy cards 
 
Table 11 . Removal steps of dummy cards 
1
2
 
1
2
 
 
 
 
Lenovo 3000 N500 55 
						

							1030 Hard disk drive (HDD) slot cover and HDD 
For access, remove this FRU: 
v   
 “1010 Battery pack” on page 54
 
 
Table 12. Removal steps of HDD slot cover and HDD 
1
2
 
3
 
When installing: Make sure that the HDD connector is attached firmly.   
Attention: 
v   
 Do not drop the hard disk drive or apply any physical shock to it. The hard 
disk drive is sensitive to physical shock. Improper handling can cause damage 
and permanent loss of data. 
v 
 
 Before removing the drive, have the user make a backup copy of all the 
information on it if possible. 
v 
 
 Never remove the drive while the system is operating or is in suspend mode.
 
56 Lenovo 3000 N500 Hardware Maintenance Manual 
						

							Table 12. Removal steps of HDD slot cover and HDD (continued) 
4
 
 
 
 
Lenovo 3000 N500 57 
						

							1040 Optical drive 
For access, remove this FRU in order: 
v   
 “1010 Battery pack” on page 54
 Table 13. Removal steps of optical drive 
1 
Step Screw (quantity) Color Torque 

1 M2.5 × 10 mm, wafer-head, nylon-coated 
(1) 
Black 2.0 Nm
(2.5
 kgfcm) 
3
2
 
 
 
 
58 Lenovo 3000 N500 Hardware Maintenance Manual 
						

							1050 Thermal slot cover 
For access, remove this FRU in order: 
v   
 “1010 Battery pack” on page 54
 Table 14. Removal steps of thermal slot cover 
2
11
 
 
 
 
Lenovo 3000 N500 59 
						

							1060 DIMM 
For access, remove these FRUs in order: 
v   
 “1010 Battery pack” on page 54 
v 
 
 “1050 Thermal slot cover” on page 59
 Table 15. Removal steps of DIMM 
1
1
2
 
Note: If only one DIMM is used on the computer you are servicing, the card 
must be installed in SLOT-0 (
a: lower slot), but not in SLOT-1 (
b: upper 
slot).
b
a
 
When installing: Insert the notched end of the DIMM into the socket. Press the 
DIMM firmly, and pivot it until it snaps into the place. Make sure that it is 
firmly fixed in the slot and does not move easily. 
 
 
60 Lenovo 3000 N500 Hardware Maintenance Manual 
						

							1070 Fan assembly 
For access, remove these FRUs in order: 
v   
 “1010 Battery pack” on page 54 
v 
 
 “1050 Thermal slot cover” on page 59
 Table 16. Removal steps of fan assembly 
1
1
1
2
 
Step Screw (quantity) Color Torque 

1 M2.5 × 5 mm, wafer-head, nylon-coated (3) Silver 2.0 Nm
(2.5
 kgfcm) 
When installing: Make sure that the fan connector is attached firmly to the 
system board. 
 
Lenovo 3000 N500 61 
						

							Table 16. Removal steps of fan assembly (continued) 
3
 
 
 
 
62 Lenovo 3000 N500 Hardware Maintenance Manual