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190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 7 Page 7-11
7.4.1.1.1.1 Main Indicator OBS Resolver Calibration
To calibrate the OBS resolver, touch the Calibrate key from the Main Indicator Configuration page. Next,
select 150˚ on the External CDI/HSI then touch the OK key, as prompted on the display. After the OBS
resolver is finished calibrating, the GTN will display “OBS Resolver Calibration Complete!” Touch OK
after the calibration is complete. Verify OBS operation by checking that the selected course displayed at
the top of the page is within 2° of the selected course.
The Main Indicator (Analog) Configuration page allows the CDI connected to the NAV board (P1001) to
be ground checked and allows the NAV indicator interface to be verified. See Section 7.4.1.2.1 for the
ground check.
7.4.1.1.2 VOR/LOC/GS Configuration Page
(GTN 650/750 Only)
Select the VOR/LOC/GS key on the GTN Setup page. This
page allows you to verify the CDI outputs from the
VOR/LOC/GS receiver as well as the OBS resolver input to
the VOR receiver. It also allows you to select the format for
the DME tuning data.
7.4.1.1.2.1 Calibrate OBS Resolver
To calibrate the OBS resolver, touch the Calibrate key from
the VOR/LOC/GS Configuration page. Next, select 150˚ on
the external CDI/HSI, then touch the OK key when
prompted by the display. Touch OK after calibration is
complete. Verify OBS operation by checking that the
selected course displayed at the top of the page is within 2°
of the selected course.
Figure 7-3. VOR/LOC/GS
Configuration Page