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Maintenance
5.2.3.5
Common Equipment Faults
Fault/Alarm
BATTERY/CLOCK
-12 VOLT SUPPLY
+12 VOLT SUPPLY
+5 VOLT SUPPLY
CONTROLLER
INTERFACE
5–18
Possible Problem and Action
M&C battery voltage or clock fault.
Indicates a low voltage in the memory battery. Typically, this fault 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 will typically be active when the modem is first
turned on.
-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 any of
the plug-in boards.
+12 VDC power supply fault. Use the same procedure as with -12V
fault.
+5V power supply fault. Use the same procedure as with a -12V fault.
The +5V supply requires a minimum load of 1A.
Controller fault.
Indicates a loss of power in the M&C card. Typically indicates the
controller has gone through a power on/off cycle.
Interface module fault.
Indicates a problem in programming the interface card.
SDM-300A Satellite Modem
Rev. 4
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