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15. Based on the status of the Power and Fault LEDs, choose one of the following
steps:
v Fault LED is on and dc power LED are off - The new unit might be
installed incorrectly. The dc power supply and fan unit switch may not be
turned on. The power cord plug may not be fully inserted into the power
source or the power supply and fan unit dc socket. There is not any power
to the power source that the power supply-unit is connected to. The
disconnect device might be in the OFF position. The power cord may be
faulty. Go to step 16.
v Fault LED and dc power supply and fan unit LED are on but the dc
power LED is off - The dc power supply and fan unit is faulty. Turn the dc
power supply and fan unit power switch to off and contact IBM Customer
and Technical Support for another dc power supply and fan unit.
v dc power supply and fan unit LED and dc Power LED are on and Fault
LED is off - Go to step 17.
16. Perform the following task or task(s) to resolve the problem:
v Ensure the disconnect device is set to the ON position.
v Ensure that the power switch is turned to the ON position.
v Ensure that there is power at the power source and no circuit breaker has
tripped.
v Ensure that the power cord is working and fully seated into the power
source and the dc power supply and fan unit ac socket.
v Reinstall the dc power supply and fan unit.
If the above tasks do not resolve the problem, contact IBM Customer and
Technical Support
17. Complete any remaining Recovery Guru procedures, if needed.
18. Check the status of each component in the storage subsystem.
19. Do any components have a Needs Attention LED?
v Yes - Select the Recovery Guru toolbar button in the Subsystem
Management window and complete the recovery procedure. If a problem is
still indicated, contact IBM Customer and Technical Support.
v No - Go to step 20 on page 175.
ds470071
Figure 115. Replacing a dc power supply and fan unit
174 IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide