Solving Power Problems; Solving Ethernet Controller Problems - Lenovo Converged HX Series Installation And Service Manual

Solving power problems

Use this information to solve power problems.
Power problems can be difficult to solve. For example, a short circuit can exist anywhere on any of the power
distribution buses. Usually, a short circuit will cause the power subsystem to shut down because of an
overcurrent condition. To diagnose a power problem, use the following general procedure:
Step 1. Turn off the server and disconnect all power cords.
Step 2. Check for loose cables in the power subsystem. Also check for short circuits, for example, if a
loose screw is causing a short circuit on a circuit board.
Step 3. Turn on the server and check the LEDs.
Step 4. Turn off the server and disconnect all power cords.
Step 5. Remove the adapters and disconnect the cables and power cords to all internal and external
devices until the server is at the minimum configuration that is required for the server to start (see
"Solving undetermined problems" on page 63).
Step 6. Reconnect all ac power cords and turn on the server. If the server starts successfully, reseat the
adapters and devices one at a time until the problem is isolated.
If the server does not start from the minimum configuration, see "Front view" on page 14 to replace the
components in the minimum configuration one at a time until the problem is isolated.

Solving Ethernet controller problems

Use this information to solve the Ethernet controller problems.
The method that you use to test the Ethernet controller depends on which operating system you are using.
See the operating-system documentation for information about Ethernet controllers, and see the Ethernet
controller device-driver readme file.
Try the following procedures:
Step 1. Make sure that the correct device drivers, which come with the server are installed and that they
are at the latest level.
Step 2. Make sure that the Ethernet cable is installed correctly.
• The cable must be securely attached at all connections. If the cable is attached but the problem
remains, try a different cable.
• If you set the Ethernet controller to operate at 100 Mbps, you must use Category 5 cabling.
• If you directly connect two servers (without a hub), or if you are not using a hub with X ports, use
a crossover cable. To determine whether a hub has an X port, check the port label. If the label
contains an X, the hub has an X port.
Step 3. Determine whether the hub supports auto-negotiation. If it does not, try configuring the integrated
Ethernet controller manually to match the speed and duplex mode of the hub.
Step 4. Check the Ethernet controller LEDs on the rear panel of the server. These LEDs indicate whether
there is a problem with the connector, cable, or hub.
• The Ethernet link status LED is lit when the Ethernet controller receives a link pulse from the hub.
If the LED is off, there might be a defective connector or cable or a problem with the hub.
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Lenovo Converged HX3710, HX2710-E, HX3710-F Type 8689, Lenovo Converged HX Enclosure Type 5495 Installation and Service Guide