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 4, “Parts listing, Type 7377 server,” on page 125 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.
Component LED Description Action
IMM heartbeat LED Indicates the status of IMM
heartbeat boot process.
The following steps describe the different stages of the
IMM heartbeat sequencing process.
1. When this LED is blinking fast (approximately
4Hz), this indicates, that the IMM code is in the
loading process.
2. When this LED goes off momentarily, this indicates
that the IMM code has loaded completely.
3. When this LED goes off momentarily and then
starts blinking slowing (approximately 1Hz), this
indicates that IMM is fully operational.
4. If this LED does not blink within 30 seconds of
connecting a power source to the server, complete
the following steps:
a. (Trained service technician only) use the IMM
recovery jumper to recover the firmware (see
“System-board jumpers” on page 18).
b. (Trained service technician only) replace the
system board.
Note: Make sure the technician refreshes the
VPD.
PCI error LEDs An error has occurred on a PCI bus
or on the system board. An
additional LED is lit next to a failing
PCI slot.
1. Check the system event log for information about
the error.
2. If you cannot isolate the failing adapter through the
LEDs and the information in the system event log,
remove one adapter at a time, and restart the
server after each adapter is removed.
3. If the failure remains, go to http://www.ibm.com/
systems/support/supportsite.wss/
docdisplay?brandind=5000008&lndocid=SERV-
CALL for additional troubleshooting information.
Power error LED Previous ac power lost event or
unexpected system shutdown event
detected.
1. Check the ac power to the server.
2. Make sure that the power cord is connected to a
functioning power source.
3. Check the power cable connections on the system
board.
4. Replace the power-supply.
5. (Trained service technician only) Replace the
system board.
Note: Make sure the technician refreshes the
VPD.
Chapter 3. Diagnostics 57
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