Lenovo T420i Technical Information download pdf (Page 78)

Note:PlugtheyellowcableintothejacklabeledMAIN,andthebluecableintothejacklabeledAUX

onthecard.

IfthecomputeryouareservicingisawirelessWAN-readymodelanddoesnothaveawirelessWANcard,

routetheantennacablesandsecurethemwithatapeasshowninthefollowinggure.

72ThinkPadT420andT420iHardwareMaintenanceManual

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 177 178

ThinkPadT420andT420i 1
HardwareMaintenanceManual 1
FourthEdition(November2011) 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
Productdenition 31
Chapter3.Generalcheckout 33
Whattodorst 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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