IBM 8685 Hardware Maintenance Manual - Page 144

OVER SPEC on, Check the PS

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Page 144 highlights

Note: See "System" on page 162 to determine which components should be replaced by a field service technician. Diagnostics panel LED FRU/action 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 PSx LEDs and replace any indicated power supply. 2. Install an additional power supply or remove optional devices from the server. MEMORY on (The LED next to the failing DIMM is on.) Note: See "Memory errors" on page 36. 1. DIMM x 2. Memory card 3. Microprocessor 4. System board 134 xSeries 255 Type 8685: Hardware Maintenance Manual and Troubleshooting Guide

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Note:
See “System” on page 162 to determine which components should be replaced by a field service technician.
Diagnostics panel LED
FRU/action
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.
MEMORY on
(The LED next to the
failing DIMM is on.)
Note:
See “Memory errors” on
page 36.
1.
DIMM
x
2.
Memory card
3.
Microprocessor
4.
System board
134
xSeries 255 Type 8685: Hardware Maintenance Manual and Troubleshooting Guide