Lenovo B4400 Hardware Maintenance Manual - Page 57
Fan assembly and Heat Sink assembly
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Lenovo B4400 1120 Fan assembly and Heat Sink assembly 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 • "1100 System board" on page 48 Figure 12. Removal steps of fan assembly and heat sink assembly Unplug the fan connector in the direction shown by arrow a and loosen four screws b, three screws c to lift the fan assembly. 1 3 23 2 3 2 2 When installing: Make sure that the fan connector is attached firmly to the system board. 53