Lenovo 7D8T, Maintenance Manual

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'AT+CSQ' /**search max RF signal quality between ‘device” and all “carriers “ around the device **/
'AT+COPS?' /** return wwan’s registered carrier and 4G tech if it’s successful to register to carrier **/
'AT+CREG?' /** report CS network registration status –2G/3G/4G **/
'AT+CEREG?' /**report EPS network registration status – 4G **/
Observable problems
See this section to solve observable problems.
• “The server immediately displays the POST Event Viewer when it is turned on” on page 195
• “Server is unresponsive (POST is complete and operating system is running)” on page 195
• “Server is unresponsive (cannot press F1 to start System Setup)” on page 196
• “Voltage planar fault is displayed in the event log” on page 196
• “Unusual smell” on page 196
• “Server seems to be running hot” on page 196
• “Cannot enter legacy mode after installing a new adapter” on page 197
• “Cracked parts or cracked chassis” on page 197
The server immediately displays the POST Event Viewer when it is turned on
Complete the following procedure to solve the problem.
1. Correct any errors that are indicated by the light path diagnostics LEDs.
2. Make sure that the server supports all the processors and that the processors match in speed and
cache size.
You can view processor details from system setup.
To determine if the processor is supported for the server, see https://serverproven.lenovo.com/server/
se450 .
3. (Trained technician only) Make sure that processor 1 is seated correctly
4. (Trained technician only) Remove processor 2 and restart the server.
5. Replace the following components one at a time, in the order shown, restarting the server each time:
a. (Trained technician only) Processor
b. (Trained technician only) System board
Server is unresponsive (POST is complete and operating system is running)
Complete the following procedure to solve the problem.
• If you are in the same location as the server, complete the following steps:
1. If you are using a KVM connection, make sure that the connection is operating correctly. Otherwise,
make sure that the keyboard and mouse are operating correctly.
2. If possible, log in to the server and verify that all applications are running (no applications are hung).
3. Restart the server.
4. If the problem remains, make sure that any new software has been installed and configured correctly.
5. Contact your place of purchase of the software or your software provider.
• If you are accessing the server from a remote location, complete the following steps:
1. Make sure that all applications are running (no applications are hung).
2. Attempt to log out of the system and log back in.
Chapter 4
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Problem determination
195