Solving Power Problems; Solving Ethernet Controller Problems - Lenovo ThinkServer TS200 Hardware Maintenance Manual

• A defective SCSI terminator
• An incorrectly installed cable
• A defective cable
For any SCSI error message, follow these suggested actions in the order in which they are listed until
the problem is solved:
1. Make sure that external SCSI devices are turned on before you turn on the server.
2. Make sure that the cables for all external SCSI devices are connected correctly.
3. If an external SCSI device is attached, make sure that the external SCSI termination is set to automatic.
4. Make sure that the last device in each SCSI chain is terminated correctly.
5. Make sure that the SCSI devices are configured correctly.

Solving 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:
1. Turn off the server and disconnect all ac power cords.
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.
3. 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 125 for the minimum configuration).
4. Reconnect all ac power cords and turn on the server. If the server starts successfully, replace the
adapters and devices one at a time until the problem is isolated.
If the server does not start from the minimum configuration, replace the components in the minimum
configuration one at a time until the problem is isolated.

Solving 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:
• Make sure that the correct device drivers, which come with the server, are installed and that they are at
the latest level.
• 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.
• 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.
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Hardware Maintenance Manual