Comtech EF Data SDM-2020 - Manual (Page 97)

SDM-2020 Satellite Demodulator Revision 4
Front Panel Operation MN/SDM2020D.IOM
6–33
COMMON
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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.
-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. 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. 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.
6.1.8 Function Select: Stored FLTS/ALMS
FUNCTION SELECT