Comtech EF Data SDM-9000 - Manual (Page 173)

SDM-9000 Satellite Modem Maintenance
Rev. 4 6–15
Table 6-4. SDM-9000 Modem Fault Tree
MODULATOR 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
IF SYNTHESIZER X X X X
DATA CLOCK ACT X X X
DATA CLOCK SYN X X X X
I CHANNEL X X X X
Q CHANNEL X X X X
AGC X X X X
INTERNAL SCT SYN X X X X
EXT REF ACT X X X
MODULE X X X X
PROGRAMMING X X X X
CONFIGURATION X X X X
DEMODULATOR FAULTS
CARRIER DETECT X X X
IF SYNTHESIZER X X X
RX CLOCK SYN X X X
I CHANNEL X X X
Q CHANNEL X X X
DESCRAMBLER X X X
BER THRESHOLD X X X
MODULE X X X
PROGRAMMING X X X
CONFIGURATION X 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.