Download ThinkPad Edge E420 Hardware Maintenance Manual

Contents
About this manual. . . . . . . . . . .
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Chapter 1. Safety information . . . . . 1
General safety . . . . . . . . . . . . . . .
Electrical safety . . . . . . . . . . . . . .
Safety inspection guide . . . . . . . . . . .
Handling devices that are sensitive to electrostatic
discharge. . . . . . . . . . . . . . . . .
Grounding requirements . . . . . . . . . . .
Safety notices (multilingual translations) . . . . .
Laser compliance statement (multilingual
translations) . . . . . . . . . . . . . . . .
Chapter 2. Important service
information . . . . . . . . . . . . . .
Strategy for replacing FRUs . . . . . . . .
Strategy for replacing a hard disk drive . .
Important notice for replacing a system
board . . . . . . . . . . . . . . .
How to use error message . . . . . . .
Strategy for replacing FRUs for CTO, CMV, and
GAV . . . . . . . . . . . . . . . . . .
Product definition . . . . . . . . . . .
FRU identification for CTO, CMV, and GAV
products . . . . . . . . . . . . . .
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Chapter 3. General checkout . . . . .
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What to do first . . . . . . . . . . .
Checkout guide . . . . . . . . . . .
Diagnostics using PC-Doctor for DOS.
Lenovo ThinkVantage Toolbox . . . .
FRU tests . . . . . . . . . . . .
Power system checkout . . . . . . . .
Checking the ac power adapter . . .
Checking operational charging . . .
Checking the battery pack . . . . .
Checking the backup battery . . . .
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Chapter 4. Related service
information . . . . . . . . . . . . . .
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Restoring the factory contents by using Recovery
Disc Set . . . . . . . . . . . . . . . . .
Passwords . . . . . . . . . . . . . . . .
Power-on password . . . . . . . . . . .
Hard-disk password. . . . . . . . . . .
Supervisor password . . . . . . . . . .
How to remove the power-on password . . .
How to remove the hard-disk password . . .
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© Copyright Lenovo 2011
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Power management . . .
Screen blank mode . .
Sleep (standby) mode .
Hibernation mode . .
Symptom-to-FRU index . .
Numeric error codes .
Error messages . . .
No-beep symptoms . .
LCD-related symptoms
Intermittent problems .
Undetermined problems
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Chapter 5. Status indicators . . . . .
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Chapter 6. Special keys. . . . . . . .
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Chapter 7. FRU replacement
notices . . . . . . . . . . . . . . . .
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Screw notices . . . . . . . . . . . . . .
Retaining serial numbers. . . . . . . . . .
Restoring the serial number of the system
unit . . . . . . . . . . . . . . . .
Retaining the UUID . . . . . . . . . .
Reading or writing the ECA information . .
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Chapter 8. Removing and replacing a
FRU . . . . . . . . . . . . . . . . . . 53
Before servicing ThinkPad Edge E420 models .
1010 Battery pack . . . . . . . . . . . .
1020 ExpressCard blank bezel . . . . . . .
1030 Bottom slot cover . . . . . . . . . .
1040 Optical drive or travel cover . . . . . .
1050 Memory modules . . . . . . . . . .
1060 Hard disk drive assembly . . . . . . .
1070 PCI Express Mini Card for wireless LAN .
1080 PCI Express Mini Card for wireless WAN .
1080 mSATA solid state drive . . . . . . . .
1090 Backup battery . . . . . . . . . . .
1110 Keyboard . . . . . . . . . . . . .
1120 Top case assembly. . . . . . . . . .
1130 Bluetooth daughter card . . . . . . .
1140 Express sub card . . . . . . . . . .
1150 Speaker assembly . . . . . . . . . .
1160 System board assembly and fan assembly
1170 CPU . . . . . . . . . . . . . . .
1180 DC-in sub card and base cover assembly .
1190 LCD unit . . . . . . . . . . . . . .
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