Lenovo System x3550 M4 Installation And Service Manual page 143

Table 14. Light path diagnostics panel LEDs (continued)
• Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
• If an action step is preceded by "(trained technician only)," that step must be performed only by a trained
technician.
LED Description
Power-supply LEDs
Use this information to view power-supply LEDs.
The following minimum configuration is required for the server to start:
• One microprocessor in microprocessor socket 1
• One 2 GB DIMM on the system board
• One power supply
• Power cord
• Four cooling fans (fan 1, 2, 3, and 5)
• One PCI riser-card assembly in PCI connector 1
AC power-supply LEDs
Use this information to view AC power-supply LEDs.
The following minimum configuration is required for the DC LED on the power supply to be lit:
• Power supply
• Power cord
Note: You must turn on the server for the DC LED on the power supply to be lit.
The following illustration shows the locations of the power-supply LEDs on the ac power supply.
Figure 89. AC power-supply LEDs
The following table describes the problems that are indicated by various combinations of the power-supply
LEDs on an ac power supply and suggested actions to correct the detected problems.
Action
4. If the error remains, replace the following components one
at a time, in the order listed, restarting the server after
each:
a. Replace the hard disk drive.
b. Replace the hard disk drive backplane.
5. If the problem remains, go to
http://www.ibm.com/support/entry/portal/docdisplay?
lndocid=SERV-CALL.
.
Chapter 4 Troubleshooting
129