3Troubleshooting SC180 ComponentsThis section contains basic troubleshooting steps for components inside the SC180 expansionenclosures.Troubleshooting Fan ModulesUse these steps to troubleshoot fan modules.1. Check the status of the fan module using the Dell Storage Client.2. Determine the status of the fan module LEDs.If the fan fault indicator is lit, the fan module has failed.3. Reseat the fan module by removing and reinstalling it.NOTE: Allow several seconds for the expansion enclosure to recognize the fan module anddetermine its status.Troubleshooting PSUsUse these steps to troubleshoot Power Supply Units (PSUs).1. Check the status of the PSU using the Dell Storage Client.2. Determine the status of the PSU LEDs.• If the PSU fault indicator is lit, the PSU has failed.• If the Power OK LED is not lit, check the power cord and power source into which the powersupply is plugged:– Connect another device to the power source and check whether the device works.– Connect the power cord to a different power source.– Replace the power cord.• If the AC fault LED is lit, this PSU is not supplying power, though the other PSU may still besupplying power.3. Reseat the PSU by removing and reinstalling it.NOTE: Allow several seconds for the expansion enclosure to recognize the PSU and determineits status.Troubleshooting Disk DrivesUse these steps to troubleshoot disk drives in carriers (DDICs).1. Check the status of the disk drive using the Dell Storage Client.2. Determine the status of the DDIC LED.• If the DDIC fault LED is lit, the hard drive has failed.32 Troubleshooting SC180 Components