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Page Title:
Isolating Trouble in Module A23 |
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|  given above for 300 cps, 2 kc, and
3 kc. Normal test results for each
setting is 3.5 percent. Normal out-
put signal level for each setting is
1.4 volts rms.
(4) If the audio distortion output level
is found to be greater than the pre-
scribed levels, proceed to c below.
c. Faulty Part Isolation.
(1) Set the TS-382F/U to 1 kc, and ad-
just its output for a l-millivolt rms
indication on the ME-30A/U.
(2) With the push-to-talk switch pres-
sed, measure the voltages at the
points listed in the charts in a and
b below. Compare them with the
normal signal and dc vo1tages
listed.
Note: Measure all voltages to ground.
(a) Signal voltage chart.
Figure 74. Module A22, parts location.
(b) Multimeter ME-26B/U.
(c) Handset H-138/U.
(2) Connect AN/URM-43A to ANT con-
(b) Dc voltage chart.
nector J2.
(3) Set the front panel controls of the
receiver-transmitter as follows:
(a) BAND switch at 30-52.
(b) Tuning knobs for 30.00 mc.
(c) Function switch at ON.
(4) Connect the H-138/U to an AUDIO
connector.
(5) Press the push-to-talk switch.
b. 150-CVS Tone Test.
(1) Connect the ME-26B/U between
A23J3 and ground.
(3) After replacing a faulty part, re-
(2) Adjust R12 for an ME-26B/U indi-
peat the procedure given in b above.
cation of 0.8 volt.
(4) Replace A23.
(3) Adjust the AN/USM-26 to indicate
150 cps and connect it between
A23J3 and ground.
(4) Adjust R3 to obtain a 150-cps indi-
cation on the AN/USM-26.
a. Preparation.
(5) If the prescribed levels are not ob-
(1) Prepare the following equipment:
tained, proceed to c below.
(a) Frequency Meter AN/USM-26.
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