EXFO FG-750 - Manual (Page 271)

Maintenance
Fiber Guardian 257
Replacing the Power Supply Modules
Replacing the Power Supply Modules
Your unit is powered by two replaceable power supply modules (either AC
or DC). Your unit needs only one power supply module to work, but it can
house two of them. The second power supply provides redundancy.
The power supply modules are hot-swappable, which means that you do
not have to turn off your system to replace one of them. There is no need to
disassemble the unit to replace such a power supply.
Ensure that you replace the defective power supply with a new one of the
same type (AC or DC).
To replace an AC power supply:
1. Position the unit so that its back panel is facing you.
2. Locate the defective power supply (its LED will be off).
3. Disconnect the power cord from the defective power supply.
W
ARNING
To avoid serious injuries, ALWAYS TURN OFF THE DISCONNECT
DEVICE THAT IS CONNECTED TO THE DEFECTIVE POWER SUPPLY
before replacing the power supply.
Power supply
status LED