
Maintenance
Fiber Guardian 259
Replacing the Power Supply Modules
To replace a DC 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. Turn off the disconnect device that is connected to the defective power
supply.
4. Loosen the screws from the power terminals to disconnect the power
leads from the defective power supply module.
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