System-board LEDs
The following illustration shows the light-emitting diodes (LEDs) on the system
board.
1
2
3
4
5
6
7
8
9
10
11
12
DIMM LEDs
Slot 1
error LED
Slot 2
error LED
Slot 3
error LED
Slot 4
error LED
Slot 5
error LED
Slot 6
error LED
Microprocessor
mismatch
LED
DIMM
error LEDs
1 through 12
Microprocessor 1
error LED
Microprocessor 2
error LED
VRM error
LED
BMC heartbeat
LED
ServeRAID
error LED
Battery LED
For more information about the system-board LEDs, see the Problem Determination
and Service Guide on the IBM System x3400 Documentation CD.
Installation guidelines
Before you install options, read the following information:
v Read the safety information that begins on page v, the guidelines in “Working
inside the server with the power on” on page 23, and “Handling static-sensitive
devices” on page 24. This information will help you work safely.
v Before you install optional hardware, make sure that the server is working
correctly. Start the server, and make sure that the operating system starts, if an
operating system is installed, or that a 19990305 error code is displayed,
indicating that an operating system was not found but the server is otherwise
working correctly. If the server is not working correctly, see the Problem
Determination and Service Guide for diagnostic information.
v Observe good housekeeping in the area where you are working. Place removed
covers and other parts in a safe place.
v If you must start the server while the cover is removed, make sure that no one is
near the server and that no tools or other objects have been left inside the
server.
v Do not attempt to lift an object that you think is too heavy for you. If you have to
lift a heavy object, observe the following precautions:
22 System x3400 Types 7973, 7974, 7975, and 7976: User’s Guide
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