Moog Components Group
4 Port 10/100/1000 Mbps Ethernet Switch
February 23, 2009
(201640-xxx)
Page 11 of 13
1.6
Power Section Testing
Note: The +1.2V Power LED (D1) is not functional. The board will operate properly and
+1.2CVDC is being supplied to the board whether this LED is illuminated or not.
If the +5V Power LED, the +3.3V Power LED, and the +2.5V Power LED are out:
•
Check for continuity of fuse F1 with an ohmmeter.
•
Replace fuse if blown.
If only the +5V Power LED is out:
•
5V DC is present at the source
•
At J5 if powered off of external power
•
At J2 if powered off of the daughterboard expansion header.
•
If +5V is not available replace the board with a spare.
•
If +5V is available check the display LED (D10).
If only the +3.3V Power LED is out:
•
5VDC across C79 (replace board if +5VDC is not available)
•
3.3VDC across C77
•
If +3.3V is not available replace the board with a spare.
•
If +3.3V is available check the display LED (D9).
If only the +2.5V Power LED is out:
•
5VDC across C75 (replace board if +5VDC is not available)
•
2.5VDC across C65
•
If +2.5V is not available replace the board with a spare.
•
If +2.5V is available check the display LED (D7).
1.7
Optical Section Testing
If the FIBER LED, (bottom LED of D2) is off or flickering, one or more of the following conditions is
likely:
•
The fiber is broken or damaged.
•
The optical transceiver module is defective.
•
Excessive light loss (low received optical power) is being experienced.
•
The 4 Port 10/100/1000Mbps Ethernet Switch (not the optical transceiver module) is
malfunctioning.
•
There is not enough attenuation in the optical link and the receiver is saturating.
•
Check the optical level with an optical power meter and inspect all fiber optic connections
including WDMs and slip rings.
