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Table Of Contents - Lenovo 20MU Hardware Maintenance Manual

Table of Contents

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Contents
About this manual . . . . . . . . . . . . iii
General safety . . . . . . . . . . . . . . . . 1
Electrical safety . . . . . . . . . . . . . . . . 1
Safety inspection guide . . . . . . . . . . . . . 2
discharge . . . . . . . . . . . . . . . . . . 3
Grounding requirements . . . . . . . . . . . . 4
information . . . . . . . . . . . . . . . 21
Strategy for replacing FRUs . . . . . . . . . .
solid-state drive . . . . . . . . . . . . .
board . . . . . . . . . . . . . . . . .
How to use error message . . . . . . . . .
and standard models. . . . . . . . . . . . .
Product definition . . . . . . . . . . . .
FRU identification . . . . . . . . . . . .
What to do first . . . . . . . . . . . . . . .
Checkout guide . . . . . . . . . . . . . . .
Diagnosing problems . . . . . . . . . . .
Quick test programs . . . . . . . . . . .
UEFI diagnostic program . . . . . . . . .
Power system checkout . . . . . . . . . . .
operational charging . . . . . . . . . . .
information . . . . . . . . . . . . . . . 31
operating system . . . . . . . . . . . . . .
Resetting your computer . . . . . . . . .
10 fails to start . . . . . . . . . . . . .
Passwords. . . . . . . . . . . . . . . . .
Power-on password . . . . . . . . . . .
Hard disk password . . . . . . . . . . .
© Copyright Lenovo 2018
Supervisor password . . . . . . . . . . .
Power management . . . . . . . . . . . . .
Sleep mode . . . . . . . . . . . . . .
Hibernation mode . . . . . . . . . . . .
Symptom-to-FRU index . . . . . . . . . . .
Numeric error codes . . . . . . . . . . .
Error messages . . . . . . . . . . . . .
Beep errors. . . . . . . . . . . . . . .
No-beep symptoms . . . . . . . . . . .
LCD-related symptoms . . . . . . . . . .
Intermittent problems . . . . . . . . . . .
21
21
22
22
Chapter 7. Locations . . . . . . . . . 47
22
22
indicators . . . . . . . . . . . . . . . . .
22
Front view . . . . . . . . . . . . . . .
Left-side view . . . . . . . . . . . . . .
Right-side view . . . . . . . . . . . . .
25
Bottom view . . . . . . . . . . . . . .
26
Locating FRUs and CRUs . . . . . . . . . . .
26
Major FRUs and CRUs . . . . . . . . . .
27
LCD FRUs . . . . . . . . . . . . . . .
27
Miscellaneous parts . . . . . . . . . . .
27
28
Looking up FRU information . . . . . . . . . .
29
29
notices . . . . . . . . . . . . . . . . . 57
30
Screw notices . . . . . . . . . . . . . . .
Retaining serial numbers . . . . . . . . . . .
unit . . . . . . . . . . . . . . . . . .
Retaining the UUID. . . . . . . . . . . .
31
31
31
FRU. . . . . . . . . . . . . . . . . . . 61
32
General guidelines. . . . . . . . . . . . . .
32
Disabling the built-in battery . . . . . . . . . .
33
1010 Removable battery . . . . . . . . . . .
33
1020 Nano-SIM card . . . . . . . . . . . . .
33
33
34
34
35
35
35
35
36
37
38
40
40
41
. . . . . . . . .
41
47
47
48
48
48
49
50
52
53
53
56
57
58
58
59
59
61
62
62
63
i

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