Comtech EF Data SDM-309B - Manual (Page 160)

SDM-309B Satellite Modem Maintenance
MN/U-SDM309B Rev. # 6-6–15
6.2.3 Common Equipment Faults
Refer to Section 3.1.6.3, 3.2.5.3, and Figures 3-3 and 3-6 in the O&I manual.
Fault Possible Problem And Action
BATTERY M&C battery voltage fault. Indicates a low voltage in the memory battery.
Typically will be active when a modem is first turned on. Allow the modem
to charge up the battery before any other action is taken. Charge time is 5
to 8 hours depending on how long the modem has been powered down.
-12 VOLT -12 volt power supply fault. Indicates a high or low voltage condition. Level
is ± 5%.
Check for a short on the -12 volt line on the mother board or a short on the
-12 volt line of any or the plug-in boards. To gain access to the rear side of
the mother board, remove the rear panel cover. Refer to Figure 6-10 for
location of the -12 V on the mother board. Return the faulty plug-in board or
replace the chassis power supply.
+12 VOLT +12 volt power supply fault.
Use the same procedure as with -12 volt fault.
+5 VOLT +5 volt power supply fault.
Use the same procedure as with -12 volt fault. The +5 volt supply requires
a minimum load of 1A. This is accomplished with the M&C card and one
other card being plugged into the chassis.
CONTROLR Controller fault. Indicates a loss of power in the M & C card. This fault is
shown only in the stored fault menu.
INTRFACE Interface module fault. Indicates a problem in programming the interface
card. Check to see that the interface card is present and is properly seated.
If the card is properly seated this could indicate a problem in the Monitor
and Control (M&C) card or in the interface between the interface card and
M&C card. Return the defective card for repair.
6.3 Interface Fault Isolation
Stored faults for the interface are reported in the ‘sTFAULTS” menu (Section 3.1.6) of
O&I manual. The following is a list of the interface faults listed in Section 3.1.6.4,
3.1.6.5, 3.2.4.4 and 3.2.4.5. All faults are discussed in the manual for the IBS/M1200P
and the D&I/M1200P interfaces. When a fault is unique to a given interface, it will be
designated as so.