IBM 8659-71Y Maintenance Manual - Page 52

Identifying Problems Using Status LEDs

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Identifying Problems Using Status LEDs Your server has LEDs to help you identify problems with some server components. These LEDs are part of the diagnostics built into the server. By following the path of lights, you can quickly identify the type of system error that occurred. Status LEDs are located on the following components: Operator LED panel For more information, see "Front Panel Indicators" on page 85. Hard disk drive trays For more information, see "Controls" on page 82. Power supply For more information, see "Power Supply LEDs." System board See "System Board LEDs" on page 142 for locations of the LEDs on the system board. Power Supply LEDs: The AC Power LEDs, located on the rear of the power supply, provide status information about the power supply. See "Front Panel Indicators" on page 85 for the location of these LEDs. The following table describes the AC Power LEDs. AC Power LED On Off No beep, fans running, and AC power LED blinking Description and Action The power supply is on and operating correctly. There is an AC power problem. Possible causes: 1. There is no AC power to the power supply. Actions: Verify that: The power cord is properly connected to the server. The power outlet functions properly. 2. The power supply has failed. Action: Replace the power supply. System held in reset Possible causes: 1. If an optional VRM is installed and no optional processor. Action: Remove the optional VRM. 2. If optional VRM failed. Action: Replace the optional VRM. 3. If primary VRM failed. Action: Replace the system board. 4. If system board failed. Action: Replace system board. 44 Netfinity Server HMM

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Identifying Problems Using Status LEDs
Your server has LEDs to help you identify problems with
some server components.
These LEDs are part of the
diagnostics built into the server.
By following the path of
lights, you can quickly identify the type of system error that
occurred.
Status LEDs are located on the following components:
±
Operator LED panel
For more information, see “Front Panel Indicators” on
page 85.
±
Hard disk drive trays
For more information, see “Controls” on page
82.
±
Power supply
For more information, see “Power Supply LEDs.”
±
System board
See “System Board LEDs” on page
142 for locations
of the LEDs on the system board.
Power Supply LEDs:
The AC Power LEDs,
located on the rear of the power supply, provide status
information about the power supply.
See “Front Panel
Indicators” on page
85 for the location of these LEDs.
The following table describes the AC Power LEDs.
AC Power LED
Description and Action
On
The power supply is on and operating
correctly.
Off
There is an AC power problem.
Possible causes:
1.
There is no AC power to the power
supply.
Actions:
Verify that:
±
The power cord is properly
connected to the server.
±
The power outlet functions properly.
2.
The power supply has failed.
Action:
Replace the power supply.
No beep, fans
running, and AC
power LED
blinking
System held in reset
Possible causes:
1.
If an optional VRM is installed and no
optional processor.
Action:
Remove the optional VRM.
2.
If optional VRM failed.
Action:
Replace the optional VRM.
3.
If primary VRM failed.
Action:
Replace the system board.
4.
If system board failed.
Action:
Replace system board.
44
Netfinity Server HMM