Comtech EF Data SLM-5650B - System Faults;Alarms; Table A-2. SLM-5650 B Fault Tree

SLM-5650B Satellite Modem
Revision 2
Appendix A A–11 MN-SLM-5650B
A.4 System Faults/Alarms
System faults are reported in MONITOR: Alarms from the front panel menu, and stored faults are
reported in the MONITOR: Event-Log menu. To determine the appropriate action for repairing
the modem, refer to Table A-2 and the list of possible problems.
Table A-2. SLM-5650B Fault Tree
FAULT TYPE
TX IF
OUTPUT
OFF
TX
STATUS
LED
TX FAULT
RELAY (1)
RX
STATUS
LED
RX FAULT
RELAY (2)
UNIT
STATUS
LED
UNIT FAULT
RELAY (3)
AUDIBLE
ALARM
TX
AIS
RX
AIS
MODULATOR
FAULTS
NONE GREEN
MOD SYMBOL
CLOCK PLL
X RED X X X
MOD RF
SYNTHESIZER
PLL
X RED X X X
MOD I/Q
ACTIVITY
X RED X X X
MOD FILTER
CLIPPING
X RED X X X
TXINTF DATA
CLK NOT
LOCKED
RED X X X
TXINTF TX-TERR
CLK ACTIVITY
ORANGE X X
TXINTF SCT PLL
NOT LOCKED
RED X X X
TXINTF DATA/AIS ORANGE X
DEMODULATOR
FAULTS
NONE GREEN
DEMOD CARRIER
LOCK
RED X X X
DEMOD DATA
LOCK
RED X X X
DEMOD
SYNTHESIZER
PLL
RED X X X
DEMOD I/Q
ACTIVITY
RED X X X
COMPOSITE
RED X X X