Specifications

1-18 Transmitters 4000326 Rev A
Troubleshoot Alarm Conditions
Introduction
The following tables provide information about transmitter and power supply
alarms. If the amber FAULT indicator is illuminated or blinking, check the
transmitter display to determine the cause of the alarm.
Troubleshooting Transmitter Alarms
The following table shows the possible causes of transmitter alarms and their
solutions.
Note: The Laser Temperature parameter is not available in the 6473-NC Overlay
transmitter.
Alarm Status Possible Causes Possible Solutions
OK No alarms. No action required.
One or more power supply
voltages are out of
specification.
Refer to Troubleshooting
Power Supply Alarms later in
this chapter.
RF Input level is out of
specification.
See RF Level alarm later in
this table.
Software
self test
Failed
Laser temperature out of
specification.
See Laser Temperature alarm,
later in this table.
Laser or module
temperature could be too
high.
See Laser Temperature alarm
or Module Temperature alarm
later in this table.
Laser power
level
High or Low
RF level could be out of
specification.
See RF Level alarm, later in
this table
Laser bias
current
High or Low
Automatic power control
circuit failure.
Telephone the Scientific-
Atlanta assistance center in
your area.
Laser
temperature
High or Low Cooling fan failure.
Verify that the fans inside the
chassis are working.
Continued on next page