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  | Power Supply Troubleshooting  | 
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  | Table   | Troubleshooting Matrix (Dual Power Supply)  | 
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  | Supply Bad  | 
  | Supply Good  | 
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  | Lights  | 
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  | Lights  | 
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  | Front Panel  | on Back  | 
  | on Back  | 
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  | Lights  | 
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  | of Power  | 
  | of Power  | 
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  | Supply  | 
  | Supply  | 
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  | SwitchesPowerON  | 
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  | System | PowerLogicSwitchGood LED  | 
  | FailSupplyPowerLED (Red)  | 
  | TemperatureOverLED (Red)  | GoodSupplyPowerLight)  | 
  | TemperatureOverLED (Red)  | Fan  | GoodSupplyPowerLight  | 
  | TemperatureOverLED (Red)  | Fan  | Corrective | 
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  | Status | 
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  | Power  | O  | 
  | O  | 
  | O  | O  | 
  | O  | O  | O  | 
  | O  | O  | Y  | Replace Power  | 
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  | Supply  | n  | 
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  | ff  | ff  | 
  | ff  | n  | n  | 
  | ff  | n  | e  | Supply/Fan  | 
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  | voltage out  | 
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  | Power  | O  | 
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  | O  | O  | Y  | Fix cause of  | 
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  | Supply  | n  | 
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  | ff  | ff  | 
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  | ff  | n  | e  | overheat, else  | 
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  | overheat  | 
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  | s  | replace faulty  | 
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  | Power Supply  | 
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  | Fan Failure  | O  | 
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  | O  | O  | 
  | O  | O  | O  | 
  | O  | O  | Y  | Replace Power  | 
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  | ff  | ff  | 
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  | ff  | n  | e  | Supply/Fan  | 
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  | Chassis  | O  | 
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  | O  | O  | Y  | Fix cause of  | 
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  | Overheat  | n  | 
  | ff  | 
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  | ff  | n  | n  | 
  | ff  | n  | e  | overheat, else  | 
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  | s  | power down  | 
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  | immediately  | 
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Shaded text in table denotes abnormal indications.
  | Diagnostics/Troubleshooting   | |
Installer’s/User’s Manual  |