TB 9-6625-2171-24
a. Performance Check
(1) Connect measuring receiver power sensor module to TI J3. Position measuring
receiver controls to measure AM. Set LEFT-OC-RIGHT switch to OC.
(2) Press and hold LOC 90 Hz pushbutton. If measuring receiver does not indicate
an amplitude modulation between 18 and 22 percent, perform b below. Release LOC 90
Hz pushbutton.
(3) Press and hold LOC 150 Hz pushbutton. If measuring receiver does not
indicate an amplitude modulation between 18 and 22 percent, perform b below. Release
LOC 150 Hz pushbutton.
(4) Set LOC 1020 Hz switch to ON and press and hold both 90 Hz and 150 Hz
pushbuttons. Measuring receiver will indicate an amplitude modulation between 5 and 15
percent. Release 90 Hz and 150 Hz pushbuttons.
(5) Press and hold both LOC 90 Hz and 150 Hz pushbuttons. Measure distortion.
Measuring receiver will indicate less than 10 percent. Release LOC 90 Hz and 150 Hz
pushbuttons.
(6) Set LOC 1020 Hz switch to OFF.
(7) Press and hold LOC 90 Hz pushbutton. Measure distortion.
Measuring
receiver will indicate less than 5 percent. Release LOC 90 Hz pushbutton.
(8) Press and hold LOC 150 Hz pushbutton. Measure distortion.
Measuring
receiver will indicate less than 5 percent. Release LOC 150 Hz pushbutton.
(9) Press and hold LOC 150 Hz pushbutton. Measure modulation rate. Measuring
receiver will indicate between 89.1 and 90.9 Hz. Release LOC 150 Hz pushbutton.
(10) Press and hold LOC 90 Hz pushbutton. Measuring receiver will indicate
between 149.85 and 150.15 Hz. Release LOC 90 Hz pushbutton.
(11) Set LOC 1020 Hz switch to ON.
(12) Press and hold both LOC 90 Hz and 150 Hz pushbuttons. Measuring receiver
will indicate between 994.5 and 1045.5 Hz. Release both LOC 90 Hz and 150 Hz
pushbuttons.
(13) Set LOC 1020 Hz switch to OFF.
b. Adjustments. Adjust A6R51 (fig. 3) for measuring receiver indication of 20 percent.
Repeat a (2) and (3) above for best compromise of adjustment (R).
a. Performance Check
(1) Set LOC PWR switch to OFF and GLIDE SLOPE PWR switch to ON. If
VAR light is illuminated, press light to extinguish.
(3) Press and hold GLIDE SLOPE 150 Hz pushbutton.
indication.