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152 Sun Enterprise 220R Server Owner’s Guide • October 1999
Power Supply Failure
If there is a problem with a power supply, the system fault indicator lights on the
front panel. If you have more than one power supply, then you can use the LEDs
located on the power supplies themselves to identify the faulty supply. The power
supply LEDs will indicate any problem with the AC input or DC output. See “Power
Supply LEDs” on page 141 for more information about the LEDs. To replace a power
supply, contact a qualified service provider.
DIMM Failure
SunVTS and POST diagnostics can report memory errors encountered during
program execution. Memory error messages typically indicate the DIMM location
number (“U” number) of the failing module. To replace a DIMM, contact a qualified
service provider.
Use the following diagram to identify the location of a failing memory module from
its U number: