Table of Contents
Advertisement
Universal Serial Bus (USB) port problems
v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 3, "Parts listing, System x3755 Type 8877 and 7163," on page 25 to determine which
components are customer replaceable units (CRU) and which components are field replaceable units
(FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Symptom
A USB device does not work.
Video problems
See "Monitor problems" on page 104.
Light path diagnostics
Light path diagnostics is a system of LEDs on various external and internal
components of the server. When an error occurs, LEDs are lit throughout the
server. By viewing the LEDs in a particular order, you can often identify the source
of the error.
When LEDs are lit to indicate an error, they remain lit when the server is turned off,
provided that the server is still connected to power and the power supply is
operating correctly.
Any memory or microprocessor LED can be lit while the microprocessor/memory
card is removed from the server so that you can isolate a problem. After ac power
has been removed from the server, power remains available to these LEDs for up
to 24 hours.
To view the memory or microprocessor LEDs, press and hold the light path
diagnostics button on the microprocessor/memory card briefly to light the error
LEDs. The LEDs that were lit while the server was running will be lit again while the
button is pressed.
Before you work inside the server to view light path diagnostics LEDs, read the
safety information that begins on page vii and "Installation guidelines" on page 37.
If an error occurs, view the light path diagnostics LEDs in the following order:
1. Check the operator information panel on the front of the server.
Action
1. Make sure that:
v The correct USB device driver is installed.
v The operating system supports USB devices.
v A standard PS/2 keyboard or mouse is not connected to the server. If it is, a
USB keyboard or mouse will not work during POST.
2. Make sure that the USB configuration options are set correctly in the
Configuration/Setup Utility program menu (see the User's Guide 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.
v If the information LED is lit, it indicates that a noncritical event has occurred.
An LED on the light path diagnostics panel might also be lit to help isolate
the error.
111
Chapter 5. Diagnostics
Advertisement
Table of Contents
