TM 11-6625-1702-35
Nomenclature
Technical manual
Common name
the value, voltage rating, and tolerance of
resistors and capacitors.
TM 11-6625-
ME-26B/U. a
200-12
2-3. Test Equipment Required
TM 11-6625-
AN/USM-140A. a
535-15
The chart in c below lists the test equipment
TM 11-6625-
and associated technical manuals required for
AN/URM-120.
446-15
troubleshooting the test set.
Radio Set
TM 11-5820-
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
___________
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
power supply must be connected for all tests.
The AN/ARC131 must be connected only in
the test set.
b. Connect all other test equipment (antenna
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-
2-5. Localizing Troubles
a. General. The troubleshooting chart (b b e -
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
p o w e r supply with an output current rating
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