Lenovo THINKSERVER 3821 - Manual (Page 145)

v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v If an action step is preceded by “(Trained service technician only),” that step must be performed only by a
trained service technician.
Lit EasyLED
diagnostics LED with
the system-error or
information LED also
lit
Description Action
CPU 2 error LED Microprocessor 2 has failed, is
missing, or has been incorrectly
installed.
Note: (Trained service technician
only) Make sure that the
microprocessors are installed in the
correct sequence; see “Removing a
microprocessor and heat sink” on
page 218 1. Check the system-event log to determine the
reason for the lit LED.
2. Find the failing, missing, or mismatched
microprocessor by checking the LEDs on the
system board.
3. (Trained service technician) Reseat the failing
microprocessor.
4. Replace the following components one at a time,
in the order shown, restarting the server each time:
a. (Trained service technician only) Failing
microprocessor
b. (Trained service technician only) System board
CPU mismatch LED A mismatched microprocessor has
been installed.
Note: All microprocessors must
have the same speed and cache
size. 1. Run the Setup Utility and view the microprocessor
information to compare the installed
microprocessor specifications.
2. (Trained service technician only) Remove and
replace one of the microprocessors so that they
both match.
VRM failure LED Microprocessor 2 VRM has failed or
is incorrectly installed. 1. Reseat the VRM
2. Replace the following components one at a time,
in the order shown, restarting the server each time:
a. VRM
b. (Trained service technician only) System board
3. Replace the VRM
System-board error
LED System-board CPU VRD, power
voltage regulators, or both have
failed. (Trained service technician only) Replace the system
board.
Battery failure LED Battery low.
1. Replace the CMOS lithium battery, if necessary.
2. (Trained service technician only) Replace the
system board.
IMM heartbeat LED Indicates the status of the boot
process of the IMM.
When the server is connected to
power this LED flashes quickly to
indicate that the IMM code is
loading. When the loading is
complete, the LED stops flashing
briefly and then flashes slowly to
indicate that the IMM if fully
operational and you can press the
power-control button to start the
server.
If the LED does not begin flashing within 30 seconds
of when the server is connected to power, do the
following:
1. (Trained service technician only) Use the IMM
recovery switch to recover the firmware (see
“System-board switches and jumpers” on page
133).
2. (Trained service technician only) Replace the
system board.
Chapter 6. Locating Server Controls and connectors 137