Common Equipment Faults - Comtech EF Data SDM-300L3 Installation And Operation Manual

SDM-300L3 Satellite Modem
Fault Isolation
9.1.3.4 Outdoor Unit
Fault/Alarm
CURRENT
VOLTAGE
TEMPERATURE
PLL LOCK
CHECKSUM
9.1.3.5

Common Equipment Faults

Fault/Alarm
BATTERY/CLOCK
-12 VOLT SUPPLY
+12 VOLT SUPPLY
+5 VOLT SUPPLY
CONTROLLER
INTERFACE
Possible Problem and Action
ODU Current fault.
ODU Voltage fault.
ODU Temperature fault.
PLL Lock fault.
Indicates the PLL is not locked to the reference of the interface
transmit clock recovery oscillator. Contact the Comtech EF Data
Customer Support Department.
Checksum fault.
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.
9–8
Revision 1
MN/SDM300L3.IOM