Comtech EF Data SDM-9000 - Manual (Page 175)

SDM-9000 Satellite Modem Maintenance
Rev. 4 6–17
Table 6-4. SDM-9000 Modem Fault Tree (Continued)
COMMON EQUIPMENT
FAULTS
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
(1)
R
X
F
A
U
L
T
L
E
D
R
X
F
A
U
L
T
R
E
L
A
Y
(2)
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
(3)
T
X
A
L
A
R
M
L
E
D
T
X
A
L
A
R
M
R
E
L
A
Y
#
2
(4)
R
X
A
L
A
R
M
L
E
D
R
X
A
L
A
R
M
R
E
L
A
Y
#
3
(5)
D
E
F
E
R
R
E
D
M
A
I
N
A
L
A
R
M
(6)
T
X
A
I
S
R
X
A
I
S
BATTERY/CLOCK X X
-12V POWER SUPPLY X X
+12V POWER SUPPLY X X
+5V SUPPLY X X
-5V SUPPLY X X
CONTROLLER X X X X
INTERFACE MODULE X X X X
BACKWARD ALARMS
(IDR ONLY)
BW ALARM RX #4 X X X
BW ALARM RX #3 X X X
BW ALARM RX #2 X X X
BW ALARM RX #1 X X X
BW ALARM TX #4 X X
BW ALARM TX #3 X X
BW ALARM TX #2 X X
BW ALARM TX #1 X X
Legend
Test Note Fault/Alarm Relay Test Points Connector/Pins
1 TX FAULT J7/Pin 4 (N.O.), 5 (COM), 6 (N.C.) *
2 RX FAULT J7/Pin 7 (N.O.), 8 (COM), 9 (N.C.) *
3 COM EQ FAULT J7/Pin 1 (N.O.), 2 (COM), 3 (N.C.) *
4 TX ALARM #2 J10/Pin 4 (N.O.), 5 (COM), 6 (N.C.) *
5 RX ALARM #3 J10/Pin 7 (N.O.), 8 (COM), 9 (N.C.) *
6 DEF MAINT ALARM J8/Pin 17 **
* A connection between the common and N.O. contacts indicate no fault/alarm.
** Signal is open collector high impedance if faulted.