System Faults/Alarms; Table A-2. Slm-5650B Fault Tree - Comtech EF Data SLM-5650B Installation And Operation Manual

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.
FAULT TYPE
MODULATOR NONE
FAULTS
MOD SYMBOL
CLOCK PLL
MOD RF
SYNTHESIZER
PLL
MOD I/Q
ACTIVITY
MOD FILTER
CLIPPING
TXINTF DATA
CLK NOT
LOCKED
TXINTF TX-TERR
CLK ACTIVITY
TXINTF SCT PLL
NOT LOCKED
TXINTF DATA/AIS
DEMODULATOR
NONE
FAULTS
DEMOD CARRIER
LOCK
DEMOD DATA
LOCK
DEMOD
SYNTHESIZER
PLL
DEMOD I/Q
ACTIVITY
COMPOSITE
Appendix A

Table A-2. SLM-5650B Fault Tree

TX
TX IF
TX FAULT
OUTPUT
STATUS
RELAY (1)
OFF
LED
GREEN
X RED X
X RED X
X RED X
X RED X
RED X
ORANGE X
RED X
ORANGE X
RX
UNIT
RX FAULT
STATUS
STATUS
RELAY (2)
LED
LED
GREEN
RED X
RED X
RED X
RED X
RED X
A–11
SLM-5650B Satellite Modem
Revision 2
UNIT FAULT AUDIBLE TX
RELAY (3) ALARM AIS
X X
X X
X X
X X
X X
X
X X
X
X
X
X
X
MN-SLM-5650B
RX
AIS
X
X
X
X
X