Lenovo ThinkSystem SR850 Maintenance Manual page 4

Remove the security bezel . . . . . . . . . 114
Install the security bezel . . . . . . . . . . 115
System board air baffle and the power interposer
replacement . . . . . . . . . . . . . . . . 116
Remove the system board air baffle and the
power interposer . . . . . . . . . . . . 116
Install the system board air baffle and the
power interposer . . . . . . . . . . . . 118
System board replacement . . . . . . . . . . 120
Remove the system board . . . . . . . . . 120
Install the system board . . . . . . . . . . 122
Update the Universal Unique Identifier
(UUID). . . . . . . . . . . . . . . . . 123
Update the DMI/SMBIOS data . . . . . . . 125
Enable TPM/TCM . . . . . . . . . . . . 127
Enable UEFI Secure Boot . . . . . . . . . 129
Top cover replacement . . . . . . . . . . . . 130
Remove the top cover . . . . . . . . . . 130
Install the top cover . . . . . . . . . . . 131
Complete the parts replacement . . . . . . . . 132
Chapter 4. Problem
determination . . . . . . . . . . . . . 135
Event logs . . . . . . . . . . . . . . . . . 135
Light path diagnostics . . . . . . . . . . . . 137
Power supply LEDs . . . . . . . . . . . 138
System-board LEDs . . . . . . . . . . . 140
General problem determination procedures . . . . 141
Resolving suspected power problems . . . . 141
Resolving suspected Ethernet controller
problems . . . . . . . . . . . . . . . 142
Troubleshooting by symptom . . . . . . . . . 143
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ThinkSystem SR850 Maintenance Manual
Drive problems . . . . . . . . . . . . . 143
Fan problems . . . . . . . . . . . . . . 146
Intermittent problems . . . . . . . . . . . 146
Keyboard, mouse, or USB-device
problems . . . . . . . . . . . . . . . 147
Memory problems . . . . . . . . . . . . 148
Monitor and video problems . . . . . . . . 149
Network problems . . . . . . . . . . . . 151
Observable problems . . . . . . . . . . . 151
Optional-device problems . . . . . . . . . 153
Power on and power off problems . . . . . . 154
Processor problems . . . . . . . . . . . 156
Serial-device problems . . . . . . . . . . 156
Software problems . . . . . . . . . . . . 157
Appendix A. Getting help and
technical assistance . . . . . . . . . . 159
Before you call . . . . . . . . . . . . . . . 159
Collecting service data . . . . . . . . . . . . 160
Contacting Support . . . . . . . . . . . . . 161
Appendix B. Notices. . . . . . . . . . 163
Trademarks . . . . . . . . . . . . . . . . 164
Important notes . . . . . . . . . . . . . . . 164
Particulate contamination . . . . . . . . . . . 164
Telecommunication regulatory statement . . . . . 165
Electronic emission notices . . . . . . . . . . 165
Taiwan BSMI RoHS declaration . . . . . . . 166
Taiwan import and export contact information . . . 167
Index . . . . . . . . . . . . . . . . . . 169