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Power supply LEDs
The ac and dc power LEDs on a power supply provide status information about the
power supply. The following illustration shows the location of the ac and dc power
LEDs. For more information about interpreting the LEDs, see "Power supply LED
errors" on page 133.
Level 2 Light Path Diagnostics
The Light Path Diagnostics LEDs help you to identify problems with server
components. By following the light path, you can quickly identify and fix the type of
problem that occurred. The light path begins with the LEDs on the operator
information panel (also known as the front LED panel). If the server encounters a
problem, it lights either the Information LED or the Fault LED.
To isolate the source of the trouble, examine the Level 2 Light Path Diagnostics
LEDs through the special cutout on the server top cover (shown at "Level 2
diagnostic panel LEDs" on page 20). These LEDs can indicate a problem with a
single component, or a problem with one of several similar components. In the latter
case, to isolate the specific failing component, remove the server top cover and
look for a lit LED on the system board, memory board, or failing component.
For example, if the FAN LED is lit, the specific failing fan is indicated by an LED
viewable with the top cover removed. If the MEM LED is lit, the specific failing
DIMM is indicated by an LED on the memory board.
Power supply 1
Table 2. Power supply minimum configurations
AC
v 1 power supply
Power supply 3
Power supply 2
DC power LED
DC
v 1 power supply
v 1 power backplane
v 1 system board
v 1 processor in slot 1
v Operator panel card
Locking latch
Locking handle
AC power LED
Diagnostics
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Table of Contents
Troubleshooting
