18 Hardware Maintenance Manual: xSeries 220
Front panel and system board LEDs
The server does not contain a diagnostic or information panel. The system error LED
is on the front panel inside the server. All of the remaining error LEDs are on the
system board, adjacent to the failing components. See “Diagnostic LEDs” for
information on identifying problems using these LEDs.
The meanings of these LEDs are as follows:
CPU1 Microprocessor number 1 (connector U12) fault
CPU2 Microprocessor number 2 (connector U11) fault
Fan 1 Fan number 1 (connector J10) failure (see note 1)
Fan 2 Fan number 2 (connector J18) failure (see note 1)
MEM1 DIMM number 1 (connector J19) fault
MEM 2 DIMM number 2 (connector J21) fault
MEM 3 DIMM number 3 (connector J23) fault
MEM 4 DIMM number 4 (connector J26) fault
VRM1 Microprocessor VRM number 1 (connector J42) fault (see note 1)
VRM2 Microprocessor VRM number 2 (connector J12) fault (see note 1)
Notes:
1. The fan and VRM LEDs will illuminate only if the optional system management
adapter is installed in the server.
2. The server does not support user-replaceable power supplies or fans.
Diagnostic LEDs
You can use the diagnostic LEDs built into the server to quickly identify the type of
system error that occurred. The server is designed so that LEDs remain illuminated
when the server shuts down, as long as the power supply is operating properly. This
feature helps you to isolate the problem if an error causes the server to shut down. To
correct specific problems, see “Symptom-to-FRU index” on page 111.
System Error LED (on the front panel) System board LED Cause
On
A system error was detected. Check to
see which of the LEDs on the system
board are on.
None The system error log is 75% or more
full or a Predictive Failure Analysis
(PFA) alert was logged.
On MEM1, MEM2, MEM3, or MEM4
(system board)
A memory error occurred.
On CPU1 or CPU2 (system board) One of the microprocessors has failed,
or a microprocessor is installed
incorrectly.
On Fan 1 or Fan 2 One of the fans has failed or is
operating too slowly.
On VRM1 or VRM2 (system board) One of the microprocessor VRMs has
failed, or a microprocessor VRM is
installed in the wrong connector.
Table 2. Diagnostic LEDs.
