Specifications

1-32 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.
Alarm Status Possible Causes Possible Solutions
OK No alarms. No action required.
Software
self test
Failed
One or more power supply
voltages are out of
specification.
Refer to Troubleshooting
Power Supply Alarms later in
this section.
Laser power
level
High or Low
RF level at the input is out
of specification.
Verify the input RF level is
within specification.
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