Serial-Device Problems; Intermittent Problems - Lenovo ThinkSystem SR650 Maintenance Manual

A Lenovo optional device that worked previously does not work now.
1. Make sure that all of the cable connections for the device are secure.
2. If the device comes with test instructions, use those instructions to test the device.
3. If the failing device is a SCSI device, make sure that:
• The cables for all external SCSI devices are connected correctly.
• The last device in each SCSI chain, or the end of the SCSI cable, is terminated correctly.
• Any external SCSI device is turned on. You must turn on an external SCSI device before you turn on
the server.
4. Reseat the failing device.
5. Replace the failing device.

Serial-device problems

Use this information to solve problems with serial ports or devices.
• "Number of displayed serial ports is less than the number of installed serial ports" on page 217
• "Serial device does not work" on page 217
Number of displayed serial ports is less than the number of installed serial ports
Complete the following steps until the problem is solved.
1. Make sure that:
• Each port is assigned a unique address in the Setup utility and none of the serial ports is disabled.
• The serial-port adapter (if one is present) is seated correctly.
2. Reseat the serial port adapter.
3. Replace the serial port adapter.
Serial device does not work
1. Make sure that:
• The device is compatible with the server.
• The serial port is enabled and is assigned a unique address.
• The device is connected to the correct connector.
2. Reseat the following components:
a. Failing serial device.
b. Serial cable.
3. Replace the following components:
a. Failing serial device.
b. Serial cable.
4. (Trained technician only) Replace the system board.

Intermittent problems

Use this information to solve intermittent problems.
• "Intermittent external device problems" on page 218
• "Intermittent KVM problems" on page 218
• "Intermittent unexpected reboots" on page 218
.
Chapter 4 Problem determination
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