Comtech EF Data SDM-9000 - Manual (Page 183)

SDM-9000 Satellite Modem Maintenance
Rev. 4 6–25
6.2.2.2.5 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 this will be
active when a modem has been hard reset, the firmware has been
changed, and the modem is first turned on. If the fault occurs without
a firmware change or hard reset of the modem, replace the
display/M&C card.
-12 VOLT SUPPLY -12 VDC power supply fault.
Indicates a high or low voltage condition. Level is
±
5%. Check for a
short on the -12 VDC line from the power supply or on any of the
plug-in boards. Check TP2 on the display/M&C card to verify the
proper -12 VDC monitor voltage (1.06 VDC). If this voltage is not
correct, it will verify that the -12 VDC supply is not at the proper level.
Try isolating the fault to a single board. If removing each of the
boards does not fix the problem, then the power supply is faulted.
Return the faulty plug-in board or replace the chassis power supply.
+12 VOLT SUPPLY +12 VDC power supply fault.
Use the same procedure as with -12V fault. To verify the +12 VDC
power supply voltage, check TP4 on the display/M&C card. A
voltage of 3.81 VDC will be monitored when the +12 VDC is at the
proper level.
+5 VOLT SUPPLY +5 VDC power supply fault.
Use the same procedure as with a -12 VDC fault. The +5 VDC
supply requires a minimum load of 1A. This is accomplished with the
display/M&C card and one other card being plugged into the
chassis. To verify the +5 VDC power supply voltage, check TP5 on
the display/M&C card. A voltage of 2.5 VDC will be monitored when
the +5 VDC is at the proper level.
-5 VOLT SUPPLY -5 VDC power supply fault.
To verify the -5 VDC power supply voltage, check TP3 on the
display/M&C card. A voltage of 2.03 VDC will be monitored when the
-5 VDC is at the proper level.
CONTROLLER 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 Interface module fault.
Indicates a problem in programming the interface card. Ensure the
interface card is present and properly seated. If the card is properly
seated, this could indicate a problem in the M&C card or in the
interface between the interface card and M&C card. Return the
defective card for repair.