Table of Contents
Advertisement
SLM-7650 Satellite Modem
Maintenance
5.2.5.5
Common Equipment Faults
Fault/Alarm
MODULE
BATTERY
-12 Vdc SUPPLY
+12 Vdc SUPPLY
+5 Vdc SUPPLY
+3.3 Vdc SUPPLY
+2.5 Vdc SUPPLY
+1.8 Vdc SUPPLY
TEMPERATURE
Modem Reference PLL
Modem Reference
Activity
Table 5-6. Common Equipment Fault Information
M&C/Interface section summary fault.
Typically indicates that the interface module will not program or the M&C has failed.
Return the modem for repair.
M&C battery voltage fault.
Indicates a low voltage in the memory battery.
Check the modem configurations if the modem was just powered because the modem
configuration may not have been retained in the memory chip. Let the modem run for
24 hours to see if the alarm clears. Replace the battery (HW/M4T28) if the alarm does
not clear. Refer to paragraph 5.2.2.
-12 Vdc ± 5% power supply fault.
Indicates a high or low voltage condition for the -12 Vdc power supply.
Return to modem for repair.
+12 Vdc ± 5% power supply fault.
Indicates a high or low voltage condition for the +12 Vdc power supply.
Return to modem for repair.
+5 Vdc ± 5% power supply fault.
Indicates a high or low voltage condition for the +5 Vdc power supply.
Return to modem for repair.
+3.3 Vdc ± 5% power supply fault.
Indicates a high or low voltage condition for the +3.3 Vdc power supply.
Return to modem for repair.
+2.5 Vdc ± 5% power supply fault.
Indicates a high or low voltage condition for the +2.5 Vdc t power supply.
Return to modem for repair.
+1.8 Vdc ± 5% power supply fault.
Indicates a high or low voltage condition for the +1.8 Vdc power supply.
Return to modem for repair.
Over/Under Temperature Fault. Indicates that the internal temperature of the modem
has exceeded +75 degrees C or is below -10 degrees C.
Could indicate that the fan is not operating properly. Also assure the proper operating
temperature environment for the modem.
Modem Reference lock fault.
The internal modem reference has failed to lock to the selected reference.
Return the modem for repair.
External modem reference activity fault.
Indicates the external modem reference signal is not detected at CP3 on the rear
panel.
Possible Problem and Action
5–13
Revision 4
MN/SLM7650.IOM
Advertisement
Table of Contents
