7320 IFL Installation and User’s Guide
Trouble Shooting
Foxcom Proprietary Information
24
Document No. 93-005-28-C
6. Trouble Shooting
The System 7320 was tested before it left the factory. However if you are experiencing
difficulties consult the list below for possible solutions. If your system is still experiencing
problems, please attempt to isolate and identify the malfunctioning unit.
Table 6 - Trouble Shooting
PROBLEM POSSIBLE
CAUSE
1. Laser LED not on
1. No DC power to the unit. Possible power supply problem or AC
power input problem. Check the fuse.
2. Verify LSRI monitor is -4.5V
±
0.3. If not, laser may have
overheated. Disconnect power or remove plug in and allow to
cool. Try again with better airflow.
3. If an optical power meter is available, measure the optical power
out of the transmitter. The power should be 0.3 mW to 1 mW. If
an optical power meter is not available, then use another receiver
to determine if there is optical power emerging from the
transmitter (use the 5 meter jumper cable). If there is no optical
power, then the transmitter unit is malfunctioning.
If any or all the above are not within the guidelines, the transmitter
unit is faulty.
2. Lack of RF signal
present at Receiver, yet
optical power is
functioning.
1. If the unit has an LNB drive option, verify that the correct
LNB bias is coming down the center of the RF connector at the
transmit site.
2. Verify that the dish is pointed and correctly receiving satellite
signals.
Conclusion: If signal still not present then Transmitter input stage
amplifier is defective. Contact Foxcom.
3. No optical power, LED
not illuminated.
1. There is a break or severe bend in the fiberoptic cable. Use an
optical power meter or another functioning receiver unit to
verify optical power coming down the fiber.
2. Optical power too low, too many splits, too long a distance (thus
exceeding optical budget). System
may still function
without
LED illuminated although at reduced performance.
3. The transmitter is not functioning, see above.
