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v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 8, “Parts Listing, TD200x Machine Types 3719, 3821, 3822, and 3823,” on page 237 to
determine which components are customer replaceable units (CRU) and which components are field
replaceable units (FRU).
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 “Installing a
microprocessor and heat sink” on
page 220.
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.
86 ThinkServer TD200x Types 3719, 3821, 3822, and 3823: Hardware Maintenance Manual