Contents

About this manual. . . . . . . . . . . iii

Chapter 1. Safety information . . . . . 1

General safety . . . . . . . . . . . . . . . . 1 Electrical safety . . . . . . . . . . . . . . . 2 Safety inspection guide . . . . . . . . . . . . 3

Handling devices that are sensitive to electrostatic discharge. . . . . . . . . . . . . . . . . . 3

Grounding requirements . . . . . . . . . . . . 4 Safety notices (multilingual translations) . . . . . . 4

Laser compliance statement (multilingual

translations) . . . . . . . . . . . . . . . . 18

Chapter 2. Important service

 

information

25

Strategy for replacing FRUs

25

Strategy for replacing a hard disk drive . . .

26

Important notice for replacing a system

 

board

26

How to use error message

26

Strategy for replacing FRUs for CTO, CMV, and

 

GAV

26

Product definition

26

FRU identification for CTO, CMV, and GAV

 

products

27

Chapter 3. General checkout

29

What to do first

29

Checkout guide

30

Diagnostics using PC-Doctor for DOS. . . .

30

Lenovo ThinkVantage Toolbox

33

FRU tests

33

Power system checkout

34

Checking the ac power adapter

34

Checking operational charging

35

Checking the battery pack

35

Checking the backup battery

36

Chapter 4. Related service

 

information

37

Restoring the factory contents by using Recovery

 

Disc Set

37

Passwords

38

Power-on password

38

Hard-disk password

38

Supervisor password

39

How to remove the power-on password . . .

39

How to remove the hard-disk password . . .

39

Power management

40

Screen blank mode

40

Sleep (standby) mode

40

Hibernation mode

41

Symptom-to-FRU index

41

Numeric error codes

42

Error messages

44

No-beep symptoms

44

LCD-related symptoms

44

Intermittent problems

45

Undetermined problems

45

Chapter 5. Status indicators

47

Chapter 6. Fn key combinations . . .

49

Chapter 7. FRU replacement

 

notices

53

Screw notices

53

Retaining serial numbers

54

Restoring the serial number of the system

 

unit

54

Retaining the UUID

54

Reading or writing the ECA information . . .

55

Chapter 8. Removing and replacing a

 

FRU

57

1010

Battery pack

57

1020

ExpressCard blank bezel and Media Card

 

blank bezel

58

1030

Optical drive or travel cover

60

1040

Thermal cover

61

1050

Hard disk drive or solid state drive

 

assembly

62

1060

DIMM

65

1070

Fan assembly

66

1080

CPU

68

1090

SIM slot cover

69

1110

Wireless WAN slot cover and PCI Express

 

Mini Card for wireless WAN

71

1110 mSATA solid state drive

73

1120

Palm rest assembly with cables

74

1130

PCI Express Mini Card for wireless LAN . .

78

1140

Backup battery

80

1150

Bluetooth daughter card

80

1160

Media Card Reader slot board and Media

 

Card Reader cable assembly

81

1170

Keyboard

83

© Copyright Lenovo 2011

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Lenovo L421, L520, L420 manual Contents

L420, L520, L421 specifications

The Lenovo L421, L520, and L420 are part of Lenovo's ThinkPad series, which is known for its reliability, durability, and performance. These models are designed primarily for business professionals and students, providing a blend of functionality and portability tailored for everyday computing.

The Lenovo L421 is equipped with the second-generation Intel Core processors, which enhance its performance and efficiency. It features a 14-inch LED backlit display, offering sharp visuals and sufficient screen real estate for multitasking. The L421 also sports a spill-resistant keyboard, ensuring that accidental spills do not affect the device's functionality. This model supports up to 8GB of RAM and incorporates various connectivity options, including USB 3.0 ports, HDMI, and an SD card reader, which makes it versatile for various peripherals.

The L520 is another solid offering from Lenovo, featuring a slightly larger 15.6-inch display for increased productivity. It shares many characteristics with the L421, such as the use of Intel’s second-generation processors. The L520 also emphasizes security with features like a fingerprint reader and a Trusted Platform Module (TPM) for data encryption, appealing to businesses that require stringent security measures. Its ExpressCard and docking station compatibility add flexibility, allowing users to tailor their setups according to their needs.

The L420, like its siblings, comes with an emphasis on performance and utility. With a 14-inch HD display, it offers vibrant visuals. The L420 also benefits from Lenovo's legendary keyboard design, which ensures a comfortable typing experience. This model is geared for users who require a balance between performance and portability without compromising on essential features. The same Intel Core processors and security features are incorporated, ensuring a reliable experience for professional applications.

All three models feature Lenovo's innovative Power Management technology, which optimizes battery life, allowing users to work longer hours without needing to recharge. Additionally, they are built with robust materials that ensure longevity, making them suitable for both office and on-the-go environments.

Overall, the Lenovo L421, L420, and L520 exemplify the ThinkPad series' commitment to performance, security, and durability, making them excellent choices for anyone looking for reliable laptops for professional use.