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SNM-1001L Satellite Modem
Fault Isolation
BATTERY/CLOCK
-12V POWER SUPPLY
+12V POWER SUPPLY
INTERFACE MODULE
Test Note
*
**
***
****
*****
+
T
T
T
X
X
X
I
F
F
F
A
A
U
U
O
L
L
U
T
T
T
P
L
R
U
E
E
T
D
L
A
O
Y
F
F
1
+5V SUPPLY
CONTROLLER
SELF TEST
Fault/Alarm Relay
1
TX FAULT
2
RX FAULT
3
COM EQ FAULT
4
TX ALARM #2
5
RX ALARM #3
6
PRIMARY ALARM
7
SECONDARY ALARM
8
DEF MAINT ALARM
A connection between the common and N.C. contacts indicate fault.
Signal is open collector high impedance if faulted.
A connection between the common and N.O. contacts indicate alarm.
Figure 9-1. SNM-1001L Fault Tree (Continued)
R
R
C
C
T
T
X
X
O
O
X
X
M
M
F
F
A
A
A
A
E
E
L
L
U
U
Q
Q
A
A
L
L
R
R
T
T
F
F
M
M
A
A
L
R
U
U
L
R
E
E
L
L
E
E
D
L
T
T
D
L
A
A
Y
L
R
Y
E
E
D
L
#
A
2
Y
2
3
4
X
X
X
X
X
X
X
X
X
X
X
X
Test Points Connector/Pins
Pin 4 (NO), 5 (COM), 6 (NC) ****
Pin 7 (NO), 8 (COM), 9 (NC) ****
Pin 1 (NO), 2 (COM), 3 (NC) ****
Pin 4 (NO), 5 (COM), 6 (NC) +
Pin 7 (NO), 8 (COM), 9 (NC) +
Pin 43 (NO), 10 (COM), 27 (NC) +
Pin 44 (NO), 11 (COM), 28 (NC) +
Pin 17 *****
IDR only.
IBS only.
D&I only.
9–4
MN/SNM1001L.IOM
R
R
S
P
S
D
X
X
P
R
E
E
A
I
C
F
A
A
R
M
O
E
L
L
E
A
N
R
A
A
R
D
R
R
R
R
Y
A
E
M
M
E
R
D
L
A
Y
L
R
A
L
M
E
E
Y
A
A
A
D
L
R
L
I
A
A
M
A
N
Y
L
R
A
R
M
A
#
R
E
L
3
M
L
R
A
A
E
R
#
Y
L
M
1
A
Y
5
6
7
8
**
**
*
***
***
X
X
X
X
X
X
X
Revision 1
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