1140 Base Cover, Speakers, Power Assembly And Io Board - Lenovo B4400 Hardware Maintenance Manual

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
arrows b .
Step Screw (quantity)
a
M2.5 × 5 flat-head, nylok-coated (4)
, and then remove the speakers in the direction shown by
a
a
a
b
Lenovo B4400
a
a
b
Color Torque
Black 3.5 kgfcm
55