AR 10013130, Operating And Service Manual

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Model 2000TP2G8B
18 Rev -
Event Screen - From MENU 5, S2 (labeled EVENT) provides a display of events logged by the control
system. These events include AC power-up, heater warm-up, change from standby to operate, faults, and
resets. The events are stored in a first-in-first-out (FIFO) software buffer that has room for 100 events; as
new events are logged, the older ones are discarded.
System Shutdown Screen - In the event of a system shutdown due to a fault (refer to Table 3-5) the MENU
screen is replaced by a screen indicating the nature of the fault. Softkey S4 (labeled OK) is implemented as a
reset key; pressing S4 brings back the MENU screens. Line 3 of MENU 1, which normally displays the
operational state of the TWTA, is used as a fault display line until the fault is cleared. Most faults will turn
HV off, unless otherwise specified in Table 3-5. When these faults are cleared the system will automatically
resume the standby state and operate on will be enabled once again.
Some faults (O/PLS WIDTH, OVER DUTY, and EXTERNAL INHIBIT) will turn off RF while the fault is
being displayed on the screen. HV will remain on during these faults. Once the fault is corrected the fault
will clear and the system will turn RF back on automatically.
Factory Service Screens - A number of screens intended for factory service and calibration are behind
passwords and are not accessible to the user.
System Malfunction Screens - A number of screens are reserved to display error messages. These messages
are not normally seen and indicate a malfunction of the TWTA. System malfunction messages include the
following:
•
Database corrupt
•
Communication failure
•
Cannot restore
•
CU line voltage too low to operate. System shutdown
In the event that one of these appears, shut off the TWTA and contact an authorized service representative
before proceeding.
CAUTION:
Attempts to operate the TWTA despite control unit problems may result
in loss of the static RAM database and calibration information.