IBM 88371RU Maintenance And Troubleshooting Manual page 84

1. Check the system-error LED on the operator information panel on the front of
Figure 61. Release latch for light path diagnostics panel
2. Check the light path diagnostics panel. Press the release latch on the operator
Figure 62. Light path diagnostics panel
3. Once you know the general type of error and the general location of the
4. If the lit LED on the light path diagnostics panel refers to a specific internal
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xSeries 336 Type 1879 and Type 8837: Hardware Maintenance Manual and Troubleshooting Guide
the server. A lit system-error LED indicates that a problem exists.
information panel; then, slide out the light path diagnostics panel to view the lit
LEDs. These LEDs indicate the type of error that has occurred and are
described in more detail at "Light path diagnostics errors" on page 93.
component involved, the next step is to check the system service label on the
outside of the server.
This label gives an overview of internal components that correspond to many of
the LEDs on the light path diagnostics panel and can help to view lit LEDs
inside the server.
Note: Some of the LEDs on the light path diagnostics panel will not have a
corresponding LED lit on the system board. For example:
v LEDs for the power supplies and hard disk drives are located on or
near the individual power supply or hard disk drive.
v Some error conditions are corrected by taking an action not related to
one particular component; see step 5 on page 75.
component as indicated in step 3, look inside the server to check the lit LEDs
on the system board (see Figure 59 on page 73). For example, a
microprocessor error will light the LED next to the failing microprocessor.
a. To view LEDs inside the server without turning off the server, read "Working
inside the server with the power on" on page 15; then, remove the cover
and look for any lit error LEDs.
b. To view LEDs inside the server without ac power to the server, complete the
following steps.
Release latch