IBM XSERIES 255 TYPE 8685, Hardware Maintenance Manual And Troubleshooting Manual

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Note: See “System” on page 160 to determine which components should be replaced by a field service technician.
Diagnostics panel LED FRU/action
PS2 on
1. Check the dc good LED on power supply 2. If it is off, replace power
supply 2.
2. Power backplane.
CPU on (The LED next to the
failing CPU is on.)
1. Run the Configuration/Setup Utility program to verify that all
microprocessors have identical cache sizes and types, clock speeds and
clock frequencies.
2. Microprocessor.
3. System board.
VRM on (Either the LED next to
the failing VRM or other LEDs will
be on.)
1. Voltage regulator module indicated by the lit VRM LED
2. Microprocessor indicated by the microprocessor LED
3. If memory board VRM LED (CR46) is on, memory board
4. If system board VRM LED (CR45) is on, system board
TEMP on
1. Ambient temperature must be within normal operating specifications.
See “Features and specifications” on page 3.
2. Ensure fans are operating correctly.
3. Examine System Error Log.
a. System over recommended temperature
v
Information LED panel
b. DASD over recommended temperature (DASD LED also on)
1) Overheating hard drive
2) DASD backplane
c. System over recommended temperature for CPU x (where x is 1 or 2)
(CPU LED is also on)
1) CPU x
2) System board
4. If the CPU LED on the diagnostics panel is also lit, one of the
microprocessors has caused the error.
PS3 on
1. Check the dc good LED on power supply 3. If it is off, replace power
supply 3.
2. Power backplane, if installed.
PS4 on
1. Check the dc good LED on power supply 4. If it is off, replace power
supply 4.
2. Power backplane, if installed.
FAN on
1. Check individual fan LEDs.
2. Replace respective fan.
3. Fan cable.
4. System board.
5. Power backplane.
OVER SPEC on
1. Add an additional power supply.
2. Remove optional devices from the server.
NONREDUND on
1. Check the PS x LEDs and replace any indicated power supply.
2. Install an additional power supply or remove optional devices from the
server.
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xSeries 255 Type 8685: Hardware Maintenance Manual and Troubleshooting Guide