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UNITY 4600 USER’S MANUAL
800032-01 Rev. F 48 www.wegener.com
intermediate line amplifiers) has DC power and trace the connection from the
LNB to the IRD or try replacing the LNB. If a spectrum analyzer is available,
look for the carrier at the L-band intermediate frequency. (For domestic C-
band satellites, this is 5150 minus the downlink frequency in MHz.)
b. The selected IRD RF port has failed. To rule out this possibility, try connecting
the RF cable to another RF port and select that port (or use the RF Switch
Bypass to force that other port).
c. The IRD receiver card has failed. To rule this out, try using another IRD.
2. If the first alarm message is “No Carrier Lock”, verify the RF Feed Port, Carrier
Frequency, Data Rate, FEC Ratio, and ID Tag (if Tags are in use) settings. Also
verify that the LNB LO frequency setting (in the IRD) is correct for the selected RF
feed port.
3. If the alarm message is “RF Signal Overload”, then reduce the carrier power
entering the U4600. Either add in-line attenuation (a splitter will do) or remove line
amplification in the RF circuit between the LNB and the IRD.
Alarm and Carrier LEDs Both On
The U4600 may not be authorized for the network’s Conditional Access. If the AUTH
LED is Off and the alarm message, "Unauthorized for CA” appears, contact your net-
work provider to gain authorization in its Conditional Access database.
Missing an
Audio, Video,
or ASI Output
With Other
Outputs Okay
Alarm or Warning LED On
Check the front-panel display for alarm or warning messages. Table 4.1: Alarm and
Warning Descriptions on page49 describes U4600 alarm and warning messages. If
the message definitions are too technical to help debug the problem, report the mes-
sages to your network provider.
Alarm and Warning LEDs Off
If no alarms or warnings are shown, suspect a bad connection or mis-programming of
the U4600:
1. If audio or video are missing, check the front-panel monitor jacks. If the front mon-
itor connections are OK, check the signal connections from the rear of the unit to
the destination. If an audio is missing from the rear-panel outputs and cannot be
detected at the front-panel monitors, check that a valid audio stream is selected
for that port and that the network provider has supplied non-quiet programming on
that audio.
2. If the ASI output is missing, check the signal connections from the rear of the unit
to the destination. If okay, check with the network provider to verify what Program
Mapping (Release 2 or later) may be in effect.