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Page Title:
Section Il. TROUBLESHOOTING PROCEDURES |
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  TM 11-6625-1702-35
Nomenclature
Technical manual
Common name
the value, voltage rating, and tolerance of
resistors and capacitors.
Multimeter
TM 11-6625-
Multimeter
ME-26B/U. a
200-12
2-3. Test Equipment Required
Oscilloscope
TM 11-6625-
Oscilloscope
AN/USM-140A. a
535-15
The chart in c below lists the test equipment
Wattmeter
TM 11-6625-
Wattmeter
and associated technical manuals required for
AN/URM-120.
446-15
troubleshooting the test set.
Radio Set
TM 11-5820-
Fm transmitter
a. Make test equipment connections with
AN/ARC-131.
670-12
care so that short circuits will not be caused
Dummy Load,
RF load
___________
b y exposed test equipment connectors. Tape
Electrical
DA-75/U.
o r sleeve (spaghetti) test prods or clips as
Antenna Coupler,
Antenna coupler
___________
necessary to leave as little exposed metal as
437S-1/1A.
needed to make contact to the test set.
a
b. Observe polarity; a negative ground is
Or
equivalent
required on the 28-volt dc line.
d. T h e f o l l o w i n g
additional
equip-
c. The following test equipment is required:
ment is required.
National/NATO stock No.
Equipment
Cable Assembly, Radiofrequency
6625-00-935-0332
CG3375/U.
Power supply, 28-volts dc
Section Il. TROUBLESHOOTING PROCEDURES
2-4. Bench Test Setup
(2) Radio Set AN/ARC-131 or equivalent
Bench testing requires that a power supply
is capable of being tuned to 30 and 76 mega-
a n d a Radio Set AN/ARC131 or equivalent
hertz (MHz). With Cable Assembly, Radio
b e connected to the test set. The 28-volt dc
Frequency CG-3375/U, connect the RF output
power supply must be connected for all tests.
o f the fm transmitter to the RF INPUT of
The AN/ARC131 must be connected only in
the test set.
specific instances. Refer to figures 4-1 through
b. Connect all other test equipment (antenna
4 - 6 for test setups. Figures 2-1 through 2-3
c o u p l e r , multimeter, wattmeter, oscilloscope,
provide parts location.
a n d RF load) to the test set as specified in
Caution: Do not attempt to remove or re-
the particular troubleshooting procedure.
place any components before reading the in-
structions in paragraph 3-1. Do not make
2-5. Localizing Troubles
resistance measurement with power applied
a. General. The troubleshooting chart (b b e -
to the test set. Do not make resistance meas-
l o w ) provides tests to determine the section
urements that would place the multimeter
o r stage of the test set that is causing the
across the test set meter M1.
malfunction.
After the trouble has been
a. Power Supply Connections.
localized, follow the appropriate isolation pro-
(1) The power supply should be a 28-volt
c e d u r e listed in paragraph 2-7 to locate the
p o w e r supply with an output current rating
defective component. Refer to figure 2-1, 2-2,
of 0 to 3 amperes. With the 28-volt power source
a n d 2-3 for location of parts, controls, and
cables, that are provided with the test set, con-
component of the test set.
nect the power supply to the 28V INPUT of
the test set.
2-2
Change 3
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