Symantec NetBackup 5220, Hardware Troubleshooting Manual

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Power module problems
There are two AC main power supply modules in the NetBackup 5220. You can
see both modules on the rear panel, right-hand side, of the device. One module
sits horizontally on top of the other module. Each module has an AC
connector/socket, an LED, and two fans. A green LED indicates normal
operation. This section describes how to troubleshoot the system when power
supply module problems occur.
Definition: The term “protection” refers to a power supply that has shut
down or locked up in order to protect itself and other components
connected to the device. A short-circuit, voltage overload or power surge
can cause self-protection.
Symptom
The power on/alarm LED indicator is amber.
NetBackup 5220 power modules