Lenovo B4400 Hardware Maintenance Manual - Page 59

Base cover, speakers, power assembly and IO board

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Lenovo B4400 1140 Base cover, speakers, power assembly and IO board For access, remove these FRUs in order: • "1010 Battery pack" on page 34 • "1020 Dummy card (Optional)" on page 35 • "1030 Hard disk drive(HDD)/Memory/Mini PCI Express Card slot compartment cover" on page 36 • "1040 Hard disk drive" on page 37 • "1050 Optical drive" on page 40 • "1060 DDR3L SDRAM" on page 41 • "1070 Mini PCI Express Card for wireless LAN/WAN" on page 42 • "1080 Keyboard" on page 44 • "1090 Keyboard bezel" on page 46 • "1110 LCD unit" on page 51 • "1100 System board" on page 48 Figure 14. Removal steps of base cover, speakers, power assembly and IO board Loosen four screws a , and then remove the speakers in the direction shown by arrows b . a a b a a b Step Screw (quantity) a M2.5 × 5 flat-head, nylok-coated (4) Color Black Torque 3.5 kgfcm 55

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Lenovo B4400
55
1140 Base cover, speakers, power assembly and IO board
For access, remove these FRUs in order:
•
“1010 Battery pack” on page 34
•
“1020 Dummy card (Optional)” on page 35
•
“1030 Hard disk drive(HDD)/Memory/Mini PCI Express Card slot
compartment cover” on page 36
•
“1040 Hard disk drive” on page 37
•
“1050 Optical drive” on page 40
•
“1060 DDR3L SDRAM” on page 41
•
“1070 Mini PCI Express Card for wireless LAN/WAN” on page 42
•
“1080 Keyboard” on page 44
•
“1090 Keyboard bezel” on page 46
•
“1110 LCD unit” on page 51
•
“1100 System board” on page 48
Figure 14. Removal steps of base cover, speakers, power assembly and IO board
Loosen four screws
, and then remove the speakers in the direction shown by
arrows
.
Step
Screw (quantity)
Color
Torque
M2.5 × 5 flat-head, nylok-coated (4)
Black
3.5 kgfcm
a
b
a
a
a
a
b
b
a