GTX 327 MAINTENANCE MANUAL
Page 5-7
190-00187-05
Rev. B
•
START/ STOP
Starts and stops the Count Up and Count Down timers.
•
CRSR
Activates the change fields for the Count Down timer when selected by the FUNC key.
•
CLR
Resets the Count Up and Count Down timers.
•
8
Reduces screen Contrast and display Brightness. Enters the number eight into the Count Down
timer.
•
9
Increases screen Contrast and display Brightness. Enters the number nine into the Count Down
timer.
5.11.1
Timer Function Test
Press the FUNC key and verify proper operation of the count up and count down timers.
5.11.2
Code Selector Pushbutton Switches
The code selector consists of eight push button (0 – 7) switches that provide 4,096 active identification codes.
Pushing one of these buttons begins the code selection sequence. The new code will not be activated until the
fourth button is pressed. While changing codes, pressing the CLR button moves the cursor to the previous digit.
When on the first digit, pressing CLR restores the last active code. Pressing the CRSR button when data entry
has begun will remove the cursor and cancel data entry. If an identification code entry is not completed the last
active code is restored.
Check all eight code selection digits and code entry into the display. When checking the EXTERNAL SWITCH
Page, verify the appropriate test harness switch operation.
5.11.3
Configuration Pages
Holding down the FUNC key and pressing the ON key provides access to the configuration pages. The FUNC
key will sequence through the configuration pages. The CRSR key will highlight selectable fields on each page.
When a field is highlighted, numeric data entry will be performed with the 0-9 keys, and list selections will be
performed with the 8 or 9 keys. Press the CRSR key to accept changes. Pressing the FUNC key moves on to the
next configuration page without saving the changes. Changes made through the configuration pages are stored in
EEPROM memory. To exit the configuration pages, turn the power off and then on again (without holding the
FUNC key).
Check each configuration page for proper data entry and display. Refer to the GTX 327 Installation Manual,
190-00187-02 for each configuration page detail.
5.12
FUNCTIONAL TEST
This section contains information for functional testing of the GTX
327 Transponder. Functional testing is used
to troubleshoot a suspected faulty unit and to verify proper operation after board replacement. Perform
functional testing before returning a repaired unit to service. These measurements are applicable after a
ten-minute warm-up period under standard conditions.
The document reference is online, please check the correspondence between the online documentation and the printed version.
