User's Manual Part 2

3EM21522AAAA Appen
d
ix C
Issue 1, March 2008 DTR-0200-SA-SIRIUS
C-7
Satellite Receiver Comm
Error
VSAT Receiver problem No VSAT input signal Check VSAT input signal
level. If good VSAT sig-
nal is present, replace
SPU
SFN Timing Error Synchronization problem This alarm is typically
raised in the beginning of
the synchronization
stage and shall disap-
pear within 16 sec.
Refer to Section 5, Fig-
ure 5-12. If the alarm is
raised persistently and
accompanied with re
synchronization – check
the delays preset in the
system. The target delay
should be more than 1
second, but less than 6
seconds.
SPU Over Temperature
Fault
SPU temperature above
the threshold
SPU temperature is too
high, or Operating Tem-
perature Threshold is not
set
Refer to Section 5, Fig-
ure 5-18. Check for valid
Operating Temperature
Threshold.
Supervisor Controller
Comm Error
I
2
C communication error
No communication with
Supervisor Processor in
Main Controller
Replace SPU
Sync 1PPS Fault 1PPS signal is not
detected by the modula-
tor
Intermittent connection
on the backplane, Main
Controller, Modulator
Replace the SPU
Sync 10MHz Fault 10MHz signal is not
detected by the modula-
tor
Intermittent connection
on the backplane, Main
Controller, Modulator
Replace the SPU
Sync Lost GPS signal lost, or prob-
lem with Modulator or
Main Controller modules
GPS signal lost, or prob-
lem with Modulator or
Main Controller modules
Check GPS input. If GPS
is present, replace SPU.
Up-converter Fault Up-converter PLL
unlocked
Up-converter PLL
unlocked
Up-converter Comm
Error
Communication error
with up-converter in SPU
Communication error
with up-converter in SPU
Replace SPU
VCXO Unlocked 10 MHz not locked to
1PPS
10 MHz not locked to
1PPS
Replace SPU
VSAT Comm Error Error communicating with
VSAT Receiver located in
the SPU
Possible SPU backplane
or VSAT Receiver fault
Replace SPU
VSAT LNB Power Fault LNB Power block hard-
ware failure
Power block hardware
failure
Check voltage to LNB. If
good, replace LNB.
Table C-1 Alarms, Possible Causes, and Suggested Response (Continued)
Alarm Description Possible Cause Operator Response