888-2408-002
4-31
WARNING: Disconnect primary power prior to servicing.
Overall System Theory
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).
All the individual bits or bytes of information stored here have a default setting
which is stored in the firmware ROM. When the information in U39 is uploaded to
RAM it is checked against the default values. If it is considered to be out of
tolerance (or invalid data) it will automatically be replaced with the default value
from the ROM. When this happens the fault “EEPROM_DEF” (Default) will be
placed in the fault log. The only time this should happen is when a new EEPROM,
U39 is installed in the Master Controller. Since it is basically blank, all of the
default settings from the ROM will be written to U39 one at a time as it finds they
are out of tolerance. After this has happened, the EEPROM_DEF fault should never
happen again. If it does, U39 should be replaced since a memory location is
probably bad. For information on replacing EEPROM U39 see Section V,
Maintenance and Alignments
Summary of Contents for Z5 CD
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Page 192: ...6 40 888 2408 002 WARNING Disconnect primary power prior to servicing Troubleshooting...
Page 194: ...7 2 888 2408 002 WARNING Disconnect primary power prior to servicing Parts List...
