Table A-2. Slm-5650A Fault Tree - Comtech EF Data SLM-5650A 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
TX Interface Clock
PLL
TX INTF Clock
Activity
TX Interface SCT
PLL
TX Interface Data
As Is
DEMODULATOR
None
FAULTS
DEMOD Carrier
Lock
DEMOD Decoder
Lock
DEMOD
Synthesizer PLL
DEMOD I/Q
Activity
DEMUX Lock
Buffer
Buffer Fill
Buffer Overflow
Buffer Underflow
Buffer PLL
Buffer CLK REF
Activity
RX Interface Data
As Is
Appendix A

Table A-2. SLM-5650A Fault Tree

TX IF TX
TX FAULT
OUTPUT STATUS
RELAY (1)
OFF LED
Green
X Red X
X Red X
X Red X
X Red X
Red X
Amber X
Red X
Amber X
A–10
RX UNIT
RX FAULT
STATUS STATUS
RELAY (2)
LED LED
Green
Red X
Red X
Red X
Red X
Red X
Red X
Amber X
Amber X
Amber X
Red X
Amber X
Amber X
SLM-5650A Satellite Modem
Revision 10
UNIT
AUDIBLE
FAULT TX AIS
ALARM
RELAY (3)
X X
X X
X X
X X
X X
X
X X
X
X
X
X
X
X
X
MN-SLM-5650A
RX AIS
X
X
X
X
X
X
X