SDM-2020 Satellite Demodulator
Operation
Rev. 3
3–27
3.3.3.4
Common Equipment Faults Menu
Refer to Figure 3-9.
Fault/Alarm
Possible Problem and Action
BATTERY/CLOCK
M&C battery voltage or clock fault. Indicates a low voltage in the memory
battery.
Note:
Typically will be active when a demodulator has been Hard Reset, or
the firmware has been changed, and the demodulator is first turned On. If the
fault occurs without a firmware change or hard reset of the demodulator,
replace the battery on the demodulator board (PL/5746).
-12 VOLT SUPPLY
-12V power supply fault. Indicates a high or low voltage condition. Level is
±
5%.
Check the -12V line from the power supply or on the board. Check TP17 on
the demodulator board (PL/5746), to verify the proper -12V monitor voltage.
If this voltage is not at the proper level, this would indicate the power supply
is faulted. Return demodulator for repair.
+12 VOLT SUPPLY
+12V power supply fault.
Use the same procedure as with -12V Supply fault. To verify the +12V power
supply voltage, check TP19 on the demodulator board (PL/5746). A voltage
of 12V (± 5%), will be monitored when the +12V is at the proper level.
+5 VOLT SUPPLY
+5V power supply fault.
Use the same procedure as with -12V fault. To verify the +5V power supply
voltage, check TP5 on the demodulator board (PL/5746). A voltage of 5V (±
5%), will be monitored when the +5V is at the proper level.
CONTROLLER
Controller fault. Indicates loss of power in the M&C card.
Note:
Typically indicates the controller has gone through a power On-Off
cycle.
LNB
LNB fault. Indicates loss of LNB during operation
Note:
Typically indicates the LNB has gone through a power On-Off cycle.
Summary of Contents for SDM-2020
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Page 212: ...SDM 2020 Satellite Demodulator Glossary Rev 2 g 3 W Watt...
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