Comtech EF Data SNM-1001 - Manual (Page 57)

Maintenance SNM-1001 Network Control Modem
5–12 Rev. 1
5.2.5 Common Equipment Faults
Fault/Alarm Possible Problem and Action
BATTERY/CLOCK M&C battery voltage or clock fault.
Indicates a low voltage in the memory battery. Typically will be active when a
modem has been hard reset, or the firmware has been changed. When a hard
reset has been executed or the firmware has been changed, this fault may be
active when the modem is first turned ON. It should clear automatically as the
battery charges up.
-12V -12V power supply fault.
Indicates a high or low voltage condition. Level is ± 5 % . Check for a short on
the -12V line from the power supply or on the board. Check TP 2 on the M&C
section to verify the proper -12V monitor voltage (1.06V). If this voltage is not
correct, the modem will verify that the -12V supply is not at the proper level.
This would indicate the power supply is faulted. Return modem for repair.
+12V +12V power supply fault.
Use the same procedure as with -12V fault. To verify the +12V power supply
voltage, check TP 4 on the M&C. A voltage of 3.81V will be monitored when
the +12V is at the proper level.
+5V +5V power supply fault.
Use the same procedure as with -12V fault. To verify the +5V power supply
voltage, check TP 5 on the M&C section. A voltage of 2.5V will be monitored
when the +5V is at the proper level.
CONTROLR Controller fault.
Indicates loss of power in the M&C card. Typically indicates the controller has
gone through a power ON-OFF cycle.
INTERFACE Interface module fault.
Indicates a problem in programming the interface. This could indicate a
problem in the M&C or in the interface between the interface section and
M&C. Return the modem for repair.