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34 IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide
3.1.1 Power Supply/Cooling Module LEDs
The Power Supply/Cooling module incorporates 4 LEDs, located below the On/Off switch and
shown in tablecap.
• Under Normal conditions the LEDs should all be illuminated constant GREEN
• If a problem is detected the color of the relevant LED will change to AMBER.
Table 3–1 PSU LEDs
AC PSU
PSU Good Green
AC input Fail Amber
Fan Fault Amber
DC Output
Fail
Amber