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Power supply unit spare fuse
A spare fuse is located in the Power supply unit. It is in a holder directly below the installed
fuse. If there is no power being supplied to the unit check if the fuse is blown using the
following procedure:
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. Check the fuse on the Power supply
6. If it is blown replace it with the spare fuse
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 PSU
Mitel 3000 Australia Installation and Maintenance Manual
45
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