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170
ThinkP
ad
T420
and
T420i
Hardwar
e
Maint
enance
Manual
1
2
...
171
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ThinkPadT420andT420i
1
HardwareMaintenanceManual
1
FourthEdition(November2011)
2
©CopyrightLenovo2011
2
Contents
3
Chapter9.Locations........125
4
AppendixA.Notices.........167
4
Aboutthismanual
5
Chapter1.Safetyinformation
7
Electricalsafety
8
Safetyinspectionguide
9
Groundingrequirements
10
Chapter1.Safetyinformation5
11
.Safetyinformation7
13
Chapter1.Safetyinformation9
15
Chapter1.Safetyinformation11
17
.Safetyinformation13
19
.Safetyinformation15
21
Chapter1.Safetyinformation17
23
.Safetyinformation19
25
.Safetyinformation21
27
StrategyforreplacingFRUs
29
Howtouseerrormessage
30
Productdenition
31
Chapter3.Generalcheckout
33
Whattodorst
34
Checkoutguide
35
LenovoThinkVantageT oolbox
37
FRUtests
39
Powersystemcheckout
40
Checkingtheacpoweradapter
40
Checkingoperationalcharging
40
Checkingthebatterypack
41
Checkingthebackupbattery
41
Voltage(Vdc)
42
Red+2.5to+3.2
42
Passwords
44
Power-onpassword
44
Hard-diskpassword
44
Supervisorpassword
45
Powermanagement
47
Screenblankmode
47
Sleep(standby)mode
47
Hibernationmode
47
Symptom-to-FRUindex
49
Numericerrorcodes
49
Errormessages
51
Beepsymptoms
52
No-beepsymptoms
52
LCD-relatedsymptoms
52
.Relatedserviceinformation47
53
Intermittentproblems
54
Undeterminedproblems
54
Chapter5.Statusindicators
55
.Statusindicators51
57
Chapter6.Fnkeycombinations
59
.Fnkeycombinations55
61
Screwnotices
63
Retainingserialnumbers
64
RetainingtheUUID
65
1010Batterypack
69
1020ExpressCardblankbezel
70
3tocompletelyremoveit
71
Capturescrew(1)
72
1050DIMMslotcover
75
1080Keyboard
79
Installationstepsofkeyboard
80
1.Attachthekeyboardconnector
80
.RemovingandreplacingaFRU75
81
1100Backupbattery
85
.RemovingandreplacingaFRU85
91
.RemovingandreplacingaFRU87
93
1130SmartCard
94
1140Modemdaughtercard(MDC)
96
1150Speakerassembly
97
1160LCDunit
99
StepScrew(quantity)Color
100
Black0.181Nm
100
(1.85kgfcm)
100
Black0.392Nm
101
(4.0kgfcm)
101
1170Fanassembly
103
3tosecuretheCPU
107
.RemovingandreplacingaFRU103
109
1200Magnesiumstructureframe
112
.RemovingandreplacingaFRU107
113
1220mSATAsolidstatedrive
116
.RemovingandreplacingaFRU111
117
2010LCDbezelassembly
118
2020LEDboard
119
2030Integratedcamera
121
2040LCDpanelandLCDcable
123
2050Cameracable
125
.RemovingandreplacingaFRU121
127
.RemovingandreplacingaFRU123
129
Chapter9.Locations
131
Rearview
133
Bottomview
134
Chapter10.Partslist
135
.Partslist131
137
.Partslist133
139
.Partslist135
141
.Partslist137
143
.Partslist139
145
.Partslist141
147
.Partslist143
149
.Partslist145
151
.Partslist147
153
.Partslist149
155
.Partslist151
157
.Partslist153
159
Keyboard
160
.Partslist155
161
Miscellaneousparts
162
.Partslist157
163
Powercords
165
Recoverydiscs
166
Chapter10.Partslist161
167
Chapter10.Partslist163
169
Chapter10.Partslist165
171
Commonservicetools
172
AppendixA.Notices
173
Electronicemissionsnotices
174
Trademarks
175
*0A60007_03*
178
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