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Installation and Maintenance Manual
43
Replacing the Power Supply Unit
The procedure to be used when replacing the Power Supply unit is :-
1. Power the system down by unplugging it at the mains.
2. If a battery is installed turn off the BBU switch to disconnect the battery.
3. Remove any voice or network modules.
4. Open the CCU main cover by opening the four-quarter turn screws indicated in the first diagram
below.
5. Unplug the PSU cable from the CCU PCB.
6. Disconnect the mains lead.
7. Disconnect the Battery charger lead if equipped.
8. Unscrew the four retaining screws on the PSU as indicated below.
9. Remove the PSU.
10. Reverse the above procedure to install a new PCB.
Spare Fuse