Wegener UNITY4650, Руководство пользователя

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Unity 4650 User’s Manual
800034-01 Rev. A 74 wegener.com
No audio or
video output LEDS:
ALARM
ON and
CARRIER
OFF
The U4650 is unable to lock to an RF carrier at the selected RF port:
a) If the first front-panel alarm message is "No RF Signal", then: (1) either
the outdoor antenna LNB is not operating or is not connected to the
IRD at the selected RF port; or (2) the selected IRD RF port has failed;
or (3) the IRD receiver card has failed. To rule out (1), verify that the
LNB (and any 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). To rule out (2), try connecting
the RF cable to another RF port and select that port (or use RF Switch
Bypass to force that other port). To rule out (3), try using another IRD.
b) 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.
c) If the alarm message is “RF signal overload”, then reduce the carrier
power entering the U4650. Either add in-line attenuation (a splitter will
do) or remove line amplification in the RF circuit between the LNB and
the IRD.
LEDS:
ALARM
ON and
CARRIER
ON
The U4650 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 network provider to gain authorization in its Conditional Access
database.
Missing an
audio or
video output
while others
are okay LEDS:
ALARM
or
WARNING
ON
Check the front-panel display for alarm or warning messages. Table 8: Alarm
and Warning Descriptions on page 75 describes U4650 alarm and warning
messages. If the message definitions are too technical to help debug the prob-
lem, report the messages to your network provider.