Ericsson ECN330, User Manual

Page: 23 / 1226

Maintenance
17
1553-KDU 137 365 Uen D 2006-06-16
3 Maintenance
3.1 Replacing a Fuse
Each ECN330 DC power supply is protected by a disposable fuse, which is
located on the rear panel (please refer to Figure 1 on page 5). If needed, replace
it with a new 20 A, 250 V fuse.
Warning!
First power off the ECN330 before replacing a DC power supply fuse.
To replace a fuse, follow these steps:
1. Remove the -48 VDC power source from the ECN330.
2. Unscrew the fuse holder counter-clockwise from its socket. Pull out the
blown fuse and discard it.
3. Insert a new 20 A, 250 V fuse into the fuse holder and then screw the holder
clockwise back into the fuse socket.
4. Reconnect the -48 VDC power source to the ECN330.