Maintenance
1553-CNH 160 0787 Uen PA2 2005-09-23
21
Warning!
First power off the ECN before replacing a DC power supply fuse.
To replace a fuse, follow these steps:
1. Remove the -48 VDC power source from the ECN.
2. Unscrew the fuse holder counter-clockwise from its socket. Pull out the
blown fuse and discard it.
3. Insert a new 20 A, 250V 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 ECN.
4.3 Replacing a Fan Tray
The fan tray should be replaced if the FAN status LED turns on red (a cool-
ing fan in the fan tray has failed).
Caution!
To ensure proper cooling of the ECN, both fans must be operational. If one
fan fails the ECN will continue to run, but the fan tray should be replaced
as soon as possible.
The ECN’s fan tray can be completely removed without powering off the
unit.
To replace a fan tray, follow these steps:
1. Remove the fan tray plastic access cover on the right side of the ECN’s
front panel by pulling the cover’s right edge out, until it becomes free.
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