Lenovo U31-70 Laptop Hardware Maintenance Manual - Lenovo U31-70 - Page 3

Contents About this manual iv Safety information 1 General safety 2 Electrical safety 3 Safety inspection guide 5 Handling devices that are sensitive to electrostatic discharge 6 Grounding requirements 6 Safety notices: multilingual translations.......... 7 Laser compliance statement 14 Important service information 16 Strategy for replacing FRUs 16 Strategy for replacing a hard disk drive 17 Important notice for replacing a system board 17 Important information about replacing RoHS compliant FRUs 18 General checkout 19 What to do first 20 Power system checkout 21 Checking the AC adapter 21 Checking operational charging 21 Checking the battery pack 22 Related service information 23 Restoring the factory contents by using OneKey Recovery 23 Restore of factory default 23 Passwords 24 Power-on password 24 Hard-disk password 24 Administrator password 24 Power management 25 Screen blank state 25 Putting the computer to sleep or shutting it down 25 Putting your computer to sleep 25 Shutting down the computer 25 Lenovo U31-70 26 Specifications 26 Status indicators 28 Hotkeys 29 FRU replacement notices 30 Screw notices 30 Removing and replacing an FRU 31 1010 Base cover 32 1020 Battery pack 34 1030 PCI Express Mini Card for wireless LAN 36 1040 DIMM 38 1050 Speakers 39 1060 Hard disk drive 40 1070 Fan assembly and Heat Sink assembly 42 1080 IO board, DC-in cable 46 1090 System board 48 1100 Upper case 51 1110 LCD unit 54 1120 Integrated camera, antenna assembly and LCD hinges 57 Locations 60 Front view and right-side view 60 Bottom and Left-side view 61 Parts list 62 Overall 63 LCD FRUs 69 Miscellaneous parts 71 AC adapters 71 Screws 71 Power cords 72 Notices 75 Trademarks 76 iii