IBM 8688 - page 158

Level 2 Light Path LED FRU/action
MEM LED on (memory error)
1. Check DIMM error LED on memory board.
Note: If there is a DIMM failure, an LED on the memory board indicates the
failing DIMM. Reseat the failing DIMMs, re-enable the DIMMs using the
Configuration/Setup Utility program, and run AMIDiag to pinpoint the failing
DIMM.
2. DIMM.
3. Memory board.
DASD LED on (hot-swap hard
drive failure)
Note: If RAID system, refer to the
Hardware Maintenance Manual for
the specific RAID adapter.
1. Run the AMIDiag program.
2. Failing drive (reseat/replace).
3. Be sure the fans are operating correctly and the air flow is good.
4. SCSI backplane.
PCI-X BUS LED on (adapter
failure)
1. Check the system-error log.
2. If there is a PCI-X slot available, move the adapter to an empty PCI-X slot,
and restart the server.
3. Failing adapter.
4. PCI-X board.
FAN LED on (fan failure)
Note: A failing fan can also cause
the TEMP and DASD LEDs to be
on.
1. Check individual fan LEDs.
2. Replace respective fan.
3. Front fan connectors.
4. I/O board.
TEMP LED on (temperature too
high)
1. If a fan LED is on, replace the fan.
2. Ambient temperature must be within normal operating specifications. See
“Features and specifications” on page 3.
3. Examine the system-error log.
a. System over recommended temperature
b. Operator information panel
c. DASD over recommended temperature — overheating hard disk drive.
d. System over temperature for processor x (where x is processor number)
— microprocessor x.
e. VRM LED on — failing VRM.
f. Power supply fault / over temp — failing power supply
NMI (nonmaskable interrupt)
Note: A PCI or MEM LED may
also be on.
1. See the system-error log.
2. If a PCI LED is on, follow the instructions for that LED.
3. If a MEM LED is on, follow the instructions for that LED.
4. Restart the server.
Board LED on (system monitor
detected an error on one of the six
system boards (see system board
LEDs 1-6 for additional location
information)
1. Turn off the server and disconnect the ac power cord.
2. Wait at least 10 seconds before plugging in the ac power cord again, and
restart the server.
3. Failed system board.
Event Log See the system-error log.
PS1 LED on
1. Power supply 1
2. Top power board
3. Midplane board
PS2 LED on
1. Power supply 2
2. Top power board
3. Midplane board
148 IBM xSeries 450 Type 8688: Hardware Maintenance Manual and Troubleshooting Guide