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| TM 11-5820-401-35-1/NAVELEX 0967-432-3020
Figure 3-6. Microphone amplifier A80, printed circuit board assembly A 80A1, parts location; earlier version.
(1) Adjust the output of the PP-1104/G to
(3) The level of the output signal should be
22 volts. Adjust the output of the AN/URM-127
0.22 volt ac 2 db and the signal distortion should
to 500 Hz and then 3,000 Hz. Adjust the output
be no more than 2 percent. The sine wave indi-
of each frequency to 0.007 volt ac as measured on
cation on the oscilloscope should be undistorted.
the ME-30(*)/U. At each frequency, observe the
(4) If the required indications in (3) above
output voltage by connecting the TS-723B/U
are normal, the A80 is acceptable.
METER terminals across the 150-ohm output
c. Trouble Isolation.
load resistor (a (3) above), and observe the output
(1) Remove the cover from the A80, Figures
distortion by connecting the TS-723B/U AF IN-
PUT terminals across the 150-ohm resistor. Also
3-6 and 3-7 show parts location.
observe the sine wave indication of the signal on
(2) Connect the PP-1104/G, AN/URM-127,
the AN/USM-281A.
ME-30 (*) /U, and load resistors as explained in
a above.
(2) Repeat the operations in (1) above, ex-
cept set the output of the PP-1104/G to 25.5 and
(3) Adjust the output of the AN/URM-
30.0 volts, in turn.
127U to 1,000 Hz and the signal level at 0.007 as
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