IBM 7383, Инструкция по установке и обслуживанию, Страница: 184 / 488

Universal Serial Bus (USB) port problems
Table 30. Universal Serial Bus (USB) port problems and actions
v
Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
v
If an action step is preceded by “(Trained technician only)”, that step must be performed only by a trained
technician.
v Go to the IBM support website at http://www.ibm.com/supportportal to check for technical information, hints,
tips, and new device drivers or to submit a request for information.
Symptom Action
A USB device does not work.
1.
Make sure that:
v
The correct USB device driver is installed.
v
The operating system supports USB devices.
2.
Make sure that the USB configuration options are set correctly in the Setup
utility (see “Using the Setup utility” on page 106 for more information).
3. If you are using a USB hub, disconnect the USB device from the hub and
connect it directly to the server.
Solving power problems
Use this information to solve power problems.
About this task
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:
Procedure
1.
Turn off the server and disconnect all 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. Check the lit LEDs on the light path diagnostics panel (see “Light path
diagnostics LEDs” on page 137).
4. 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
168).
5. 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.
What to do next
If the server does not start from the minimum configuration, see “Power-supply
LEDs” on page 142 to replace the components in the minimum configuration one
at a time until the problem is isolated.
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System x3500 M4 Type 7383: Installation and Service Guide