SLM-3650 Satellite Modem
Revision 3
Maintenance
MN/SLM3650.IOM
5–9
Table 5-2. SLM-3650 Fault Tree
T
X
I
F
O
U
T
P
U
T
O
F
F
T
X
F
A
U
L
T
L
E
D
T
X
F
A
U
L
T
R
E
L
A
Y
R
X
F
A
U
L
T
L
E
D
R
X
F
A
U
L
T
R
E
L
A
Y
C
O
M
E
Q
F
A
U
L
T
L
E
D
C
O
M
E
Q
F
A
U
L
T
R
E
L
A
Y
T
X
A
L
A
R
M
L
E
D
T
X
A
L
A
R
M
R
E
L
A
Y
#
2
R
X
A
L
A
R
M
L
E
D
R
X
A
L
A
R
M
R
E
L
A
Y
#
3
S
P
A
R
E
R
E
L
A
Y
A
L
A
R
M
#
1
P
R
I
M
A
R
Y
A
L
A
R
M
R
E
L
A
Y
S
E
C
O
N
D
A
R
Y
A
L
A
R
M
R
E
L
A
Y
I
B
S
B
A
C
K
W
A
R
D
A
L
A
R
M
D
E
F
E
R
R
E
D
M
A
I
N
A
L
A
R
M
T
X
A
I
S
R
X
A
I
S
D
&
I
T
E
R
R
B
W
A
MODULATOR FAULTS
(1)
(2)
(3)
(4)
(5)
(6)
**
***
(7)
**
***
**
***
(8)
*
*
**
***
*
**
***
***
IF
SYNTHESIZER
X X X X
X X
DATA
CLOCK
SYN
X X X X
X X
I
CHANNEL
X X X X
X X
Q
CHANNEL
X X X X
X X
AGC
X X X X
X X
MODEM REF ACT
X
X
X
MODEM
REF
PLL
X X X X
X X
MODULE
X X X X
X X
CONFIGURATION
X
X
X
DEMODULATOR FAULTS
CARRIER
DETECT
X
X
X
X X
IF
SYNTHESIZER
X
X
X
X X
I CHANNEL
X
X
X
X
X
Q CHANNEL
X
X
X
X
X
BER
THRESHOLD
X
X
X X
MODULE
X
X
X
X
X
CONFIGURATION
X
X
Legend
Note
Fault/Alarm Relay
Test Points Connector/Pins
1
TX FAULT
Pin 4 (NO), 5 (COM), 6 (NC) ****
2
RX FAULT
Pin 7 (NO), 8 (COM), 9 (NC) ****
3
COM EQ FAULT
Pin 1 (NO), 2 (COM), 3 (NC) ****
4
TX ALARM #2
Pin 4 (NO), 5 (COM), 6 (NC) ****
5
RX ALARM #3
Pin 7 (NO), 8 (COM), 9 (NC) ****
6
PRIMARY ALARM
Pin 43 (NO), 10 (COM), 27 (NC) ****
7
SECONDARY ALARM
Pin 44 (NO), 11 (COM), 28 (NC) ****
8
DEF MAINT ALARM
Pin 17 *****
*
IDR only.
**
IBS only.
***
D&I only.
****
A connection between the common and N.O. contacts indicate no fault/alarm.
*****
Signal is open collector high impedance if faulted.
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