IBM eServer 342 xSeries User Reference Manual page 119

Lit LED on
diagnostics
panel
TEMP The system temperature has exceeded a
threshold level.
FAN A fan has failed or is operating too slowly.
Check the Light Path Diagnostics LEDs for the
following:
• Fan 1 Failure LED
• Fan 2 Failure LED
• CPU1 Fan-sink Failure LED
• CPU2 Fan-sink Failure LED
• Fan 3 Failure LED
Note: A failing fan can also cause the TEMP
LED to be on.
MEM A memory error occurred. Check the Light Path
Diagnostics LEDs for the following:
• CR21 Memory DIMM #1 Failure LED
• CR28 Memory DIMM #2 Failure LED
• CR18 Memory DIMM #3 Failure LED
• CR20 Memory DIMM #4 Failure LED
CPU One of the microprocessors has failed or a
microprocessor is installed in the wrong
connector. Check the Light Path Diagnostics
LEDS for the following:
• CR1 CPU #1 Failure LED
• CR1 CPU #2 Failure LED
PCI A An error occurred on PCI bus A. Either an
adapter in PCI slot 1 or the system board
caused the error.
PCI B An error occurred on PCI bus B. Either an
adapter in PCI slot 2 or 3 or the system board
caused the error.
Table 16. Light Path Diagnostics.
Cause Action
1. Check to see if a fan has failed. If it has, replace
the fan.
2. Make sure the room temperature is not too hot.
(See "Features and specifications" on page 2.)
If the problem persists, have the system serviced.
Check the LEDs on the fan assemblies and replace
the indicated fan assembly.
1. Check the DIMM failure LEDs on the system
board.
2. Replace the DIMM indicated by the lit DIMM
failure LED.
1. Check the microprocessor failure LEDs on the
system board.
2. If a microprocessor failure LED is lit, make sure
that microprocessor is installed correctly and
seated correctly. See "Installing a
microprocessor" on page 58.
3. If the problem persists, replace the
microprocessor.
If the problem persists, have the system serviced.
1. Check the error log for additional information. If
the error log indicates a problem with the
integrated Ethernet controller or the integrated
SCSI controller, have your system serviced.
2. If the error log does not list the failing adapter,
turn off the server and remove the adapter from
slot 1, and then restart the server to determine if
the adapter failed.
If the problem persists, have the system serviced.
1. Check the error log for additional information.
2. If you cannot isolate the failing adapter from the
information in the error log, try to determine the
failing adapter by removing one adapter at a time
from PCI bus B (PCI slots 2 and 3) and restarting
the server after each adapter is removed.
If the problem persists, have the system serviced.
Chapter 6. Solving problems
105