Comtech EF Data SDM-650B - Manual (Page 158)

Maintenance SDM-650B Satellite Modem
6–14 Rev. 6
6.2.3 Common Equipment Faults (CEq_Flts Menu)
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 -12V power supply fault.
Indicates a high or low voltage condition. Level is
± 5%. Check for a short on
the -12V line on the motherboard, or a short on the -12V line of any of the
plug-in boards. To gain access to the rear of the motherboard, remove the
rear panel cover. Refer to Figure 6-10 for location of the -12V on the
motherboard. Return the faulty plug-in board or replace the chassis power
supply.
+12 Volt +12V power supply fault.
Indicates a high or low voltage condition. Level is
± 5%. Check for a short on
the +12V line on the motherboard, or a short on the +12V line of any of the
plug-in boards. To gain access to the rear side of the motherboard, remove
the rear panel cover. Refer to Figure 6-10 for location of the +12V on the
motherboard. Return the faulty plug-in board or replace the chassis power
supply.
+5V Volt +5V power supply fault.
Use the same procedure as with -12V fault.
Indicates a high or low voltage condition. Level is
± 5%. Check for a short on
the +5V line on the motherboard, or a short on the +5V line of any of the
plug-in boards. To gain access to the rear of the motherboard, remove the
rear panel cover. Refer to Figure 6-10 for location of the +5V on the
motherboard. Return the faulty plug-in board or replace the chassis power
supply.
The +5V supply requires a minimum load of 1A. This is accomplished with
the M&C card and one other card being plugged into the chassis.
TXC-LOSS This is an indicator for reporting the loss of incoming DS1 data.
This alarm is active only when the DS1 interface is installed.
CONTROLR Controller fault. Indicates a loss of power in the M&C card.
This fault is shown only in the StFaults 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 M&C card, or in
the interface between the interface card and M&C card. Return the defective
card for repair.