Foxcom SATLIGHT 7225H, Installation And User Manual

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7225H Interfacility Link Installation and User’s Guide page 29
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5 Troubleshooting
The 7225H Interfacility Link unit was tested before it left the factory.
However if you are experiencing difficulties see the list below for
possible solutions. If you are still experiencing problems, attempt to
isolate and identify the malfunctioning unit before consulting
Foxcom’s technical support.
Problem Possible Cause
1. Laser LED not on a. No DC power to the unit. Possible
power supply problem or AC power
input problem. Check the power
supply fuse.
b. Verify LSRI monitor is between -4.8
and -4.2VDC. If not, laser may have
overheated. Disconnect power or
remove plug and allow to cool. Try
again with better airflow.
c. If an optical power meter is avail-
able, measure the optical power out
of the transmitter. The power
should between 2 to 5 mW [+3 to 7
dBm]. If an optical power meter is
not available, use another receiver
to determine if there is optical
power emerging from the transmit-
ter (use a 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.
a. If the unit has an LNB drive option,
verify correct LNB bias is coming
down the center of the RF connector
at the transmit site.
b. Verify dish is pointed and correctly
receiving satellite signals.
Conclusion: If signal still not present
then transmitter input stage amplifier
is defective. Contact factory.
Table 9 Troubleshooting the Transmitter