Comtech EF Data SNM-1001 - Manual (Page 53)

Maintenance SNM-1001 Network Control Modem
5–8 Rev. 1
5.2 Fault Isolation
The modem has been designed so that a qualified technician may isolate fault conditions
without removing the modem from its location. The fault monitoring capability of the
modem is designed to aid the operator in determining the cause of a failure.
System faults are reported in the Fault menu. Stored faults are reported in the StFaults
menu. The following list is to be used in isolating the problem and deciding the
appropriate action to be taken. Figure 5-4 and Figure 5-5 are diagrams of the SNM-1001
fault tree in the Burst mode and Continuous mode, respectively.
FAULT TREE
SNM-1001
1 TX INTF FLT TX CLK ACTIVITY
INTERFACE FAULTS
1 1 1
1 1 1
IF SYNTHESIZER
DATA CLOCK SYN
MOD FAULTS
AGC
MODULE
1
1 1 1
1 1
DEMOD FAULTS
IF SYNTHESIZER 1 1
BATTERY/CLOCK
-12V POWER SUPPLY
+12V POWER SUPPLY
COMMON EQUIPMENT FAULTS
1
1
1
1
1
1 1
1
1 1
1
+5V SUPPLY
CONTROLLER
INTERFACE MODULE 1 1 MODULE
TX
F
A
U
LT L
E
D
T
X
IF
O
U
T
P
U
T
O
F
F
TX
F
A
U
LT R
E
L
A
Y
RX
F
A
UL
T
RE
LA
Y
CO
M
E
Q
F
A
UL
T
LE
D
RX
F
A
UL
T
LE
D
CO
M
E
Q
F
A
UL
T
RE
L
A
Y
T
X
AL
AR
M L
E
D
RX
A
L
A
R
M
LE
D
T
X
IF
O
U
T
P
U
T
O
F
F
TX
F
A
U
LT L
E
D
TX
F
A
U
LT R
E
L
A
Y
RX
F
A
UL
T
LE
D
RX
F
A
UL
T
RE
LA
Y
CO
M
E
Q
F
A
UL
T
LE
D
CO
M
E
Q
F
A
UL
T
RE
L
A
Y
T
X
AL
AR
M L
E
D
RX
A
L
A
R
M
F
A
U
LT
L
E
D
Figure 5-4. SNM-1001 Fault Tree (Burst Mode)