IBM 72332MU Installation Guide - Page 81

Diagnosing problems using light path diagnostics, Operator information panel - specs

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LEDs remain lit when the server is connected to an ac power source but is not turned on, provided that the power supply is operating correctly. This feature helps you to isolate a problem that causes the operating system to shut down. Any memory-card LED can be lit while the memory card is removed from the server so that you can isolate a problem. After ac power has been removed from the server, power remains available to these LEDs for up to 24 hours. To view the memory-card LEDs, press and hold the light path diagnostics button on the memory card to light the error LEDs. The LEDs that were lit while the server was turned on will be lit again while the button is pressed. Diagnosing problems using light path diagnostics Before you work inside the server to view light path diagnostics LEDs, read the safety information that begins on page v, and "Installation guidelines" on page 9. If an error occurs, view the light path diagnostics LEDs in the following order: 1. Operator information panel: Look at this panel first and note the lit LEDs. v If the information LED is lit, it indicates that a suboptimal condition has occurred and that light path diagnostics might light an additional LED to help diagnose the problem. v If the system-error LED is lit, it indicates that a system error has occurred and that light path diagnostics might light an additional LED to help diagnose the problem. The following illustration shows the operator information panel. Power-control button/power-on LED Ethernet icon LED Information LED System-error LED 1 2 Power-control button cover Ethernet port activity LEDs Locator button/locator LED 2. Light path diagnostics panel: To access the light path diagnostics panel, press the release latch on the front of the operator information panel to the left; then, slide it forward. Note any LEDs that are lit, and then close the drawer. REMIND OVER SPEC LOG LINK PS PCI SP FAN TEMP MEM NMI CNFG CPU VRM DASD RAID BRD NMI button (trained service technician only) Light Path Diagnostics Note: (Trained service technician only) The NMI button is used for operating system debug purposes and will cause the server to reset if pressed. Chapter 6. Solving problems 69

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LEDs remain lit when the server is connected to an ac power source but is not
turned on, provided that the power supply is operating correctly. This feature helps
you to isolate a problem that causes the operating system to shut down.
Any memory-card LED can be lit while the memory card is removed from the server
so that you can isolate a problem. After ac power has been removed from the
server, power remains available to these LEDs for up to 24 hours.
To view the memory-card LEDs, press and hold the light path diagnostics button on
the memory card to light the error LEDs. The LEDs that were lit while the server
was turned on will be lit again while the button is pressed.
Diagnosing problems using light path diagnostics
Before you work inside the server to view light path diagnostics LEDs, read the
safety information that begins on page v, and “Installation guidelines” on page 9.
If an error occurs, view the light path diagnostics LEDs in the following order:
1.
Operator information panel:
Look at this panel first and note the lit LEDs.
v
If the information LED is lit, it indicates that a suboptimal condition has
occurred and that light path diagnostics might light an additional LED to help
diagnose the problem.
v
If the system-error LED is lit, it indicates that a system error has occurred
and that light path diagnostics might light an additional LED to help diagnose
the problem.
The following illustration shows the operator information panel.
Information LED
System-error LED
1
2
Ethernet icon LED
Power-control button/power-on LED
Ethernet port activity LEDs
Locator button/locator LED
Power-control button cover
2.
Light path diagnostics panel:
To access the light path diagnostics panel,
press the release latch on the front of the operator information panel to the left;
then, slide it forward. Note any LEDs that are lit, and then close the drawer.
DASD
NMI
PCI
PS
SP
CNFG
MEM
CPU
FAN
VRM
OVER SPEC
TEMP
Light Path
Diagnostics
BRD
LOG
LINK
RAID
REMIND
NMI button
(trained service
technician only)
Note:
(Trained service technician only) The NMI button is used for operating
system debug purposes and will cause the server to reset if pressed.
Chapter 6. Solving problems
69