the value, voltage rating, and tolerance of
resistors and capacitors.
2-3. Test Equipment Required
The chart in c below lists the test equipment
and associated technical manuals required for
troubleshooting the test set.
a. Make test equipment connections with
care so that short circuits will not be caused
b y exposed test equipment connectors. Tape
o r sleeve (spaghetti) test prods or clips as
necessary to leave as little exposed metal as
needed to make contact to the test set.
b. Observe polarity; a negative ground is
required on the 28-volt dc line.
d. T h e f o l l o w i n g
c. The following test equipment is required:
ment is required.
National/NATO stock No.
Cable Assembly, Radiofrequency
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.
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.