888-2406-002 4-31
WARNING: Disconnect primary power prior to servicing.
Overall System Theory
The Controller functions include:
• Transmitter Control Functions
• Automatic Power Control, or APC
• VSWR Monitoring and Overload Protection
• Power Supply Monitoring and Protection
• Power Amplifier Monitoring and Protection
• Automatic power foldback for VSWR, Over-temperature and Over-current con-
ditions.
• AC Restart
• System Calibration and Configuration
• Detailed Status, Metering, Configuration and Fault Diagnostics display screens.
4.7.1 Master Controller
The Master Controller is responsible for primary transmitter control and is the
summary point for all of the information gathering. It controls and/or receives
information from the PA Controllers, Power Supply Controllers and Life Support
Board and takes action appropriate to the operating conditions of the transmitter. It
is also responsible for the transmitter power control, system configuration,
calibration, VSWR protection and the Transmitter and Diagnostics displays on the
front panel.
However, the rest of the control system is designed to operate with the Master
Controller removed from the system in what is called Life Support Mode. The PA
and PS Controllers report to the Master Controller but operate independently to
allow them to continue operating even if the Master is removed. In the event of a
Master Controller failure the Life Support Board disconnects all Master Controller
control functions from the transmitter and initiates minimal protection and control
to keep the transmitter on the air. For more information on Life Support Mode, refer
to the Life Support Board description later in this section.
4.7.1.1 EEPROM U39
The Master Controller has 3 memories, ROM (firmware), RAM (volatile) and an
EEPROM (non-volatile) U39. When the low voltage is applied to the controller it
loads up the program from ROM to RAM and then goes to the EEPROM for all of
the transmitter configuration, calibration settings, power levels, fault limits etc..
Basically EEPROM U39 stores any settings that can be changed in the Diagnostics
Display. Any changes made in the Diagnostics Display will be either automatically
saved in the EEPROM or is saved when the [BACK] button is pressed (ie. Back to
Update).
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