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TM-11-6625-564-45 Maintenance Kits Electronic Equipment MK-731/ARC-51X Manual
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Section II. TROUBLESHOOTING SIMULATOR-TEST SET, RADIO SM-348/ARC-51X
C2, TM 11-6625-564-45
CHAPTER 2
TROUBLESHOOTING
Section I. GENERAL TROUBLESHOOTING TECHNIQUES
Warning: During servicing of the maintenance kit, be careful when working with the +225-
and +175-volt dc plate supply circuits.  The +175-volt dc plate supply voltage is not used in
the MK-731A/ARC-51X except at power converter 1A3 output.
(1) Visual inspection. The purpose of
2-1.
Introduction
visual inspection is to locate faults
Troubleshooting at general support and de-
without testing or measuring circuits.
pot maintenance levels includes all the techni-
All meter readings, lamp indications,
ques outlined for organizational maintenance
or other visual signs, should be ob-
and any special or additional techniques re-
served,  a n d a n a t t e m p t m a d e t o
quired to isolate a defective part. The general
localize the fault to a particular
support maintenance and depot procedures
circuit.
are not complete in themselves but supplement
(2) Operational tests. Operational tests
the procedures described in TM 11-6625-564-
frequently indicate the general lo-
12. The systematic troubleshooting procedure,
calization of trouble. In many cases,
which begins with the operational checks that
the tests will help in determining
can be performed at an organizational level,
the exact nature of the fault.
must be completed by means of localizing and
(3) V o l t a g e a n d r e s i s t a n c e m e a s u r e -
isolating techniques. Paragraphs 2-2 through
ments.  T h i s e q u i p m e n t i s p a r t i a l l y
2-9 provide intraunit (within the unit) trou-
transistorized. Observe all precau-
bleshooting procedures and describe the lo-
tions given to prevent transistor
calizing and isolating techniques that must be
damage. Make voltage and resistance
performed at general support level.
measurements in this equipment only
as specified. When measuring volt-
2-2. Organization of Troubleshooting
ages, use tape or sleeving to insu-
Procedures
late the test probe except for the
a. General. The first step in servicing a
extreme tip. A momentary short cir-
defective maintenance kit is to localize the
cuit can ruin a transistor. Use the re-
fault. Localization means tracing the fault to
sistor and capacitor color code charts
a defective stage or circuit responsible for the
and
4-5)
to
find
the
abnormal condition. Some faults, such as
value of the parts. Use the voltage
burned-out resistors, arcing, and
shorted
and resistance diagrams (fig. 2-13
transformers, can often be located by sight,
through 2-16, and 4-13) to compare
smell, and hearing. The majority of faults,
normal values with readings taken.
however, must be localized by voltage and re-
(4) Troubleshooting chart. The trouble
sistance checks.
symptoms listed in the charts (para
2-5 and 2-8) will aid in localizing
b. Localization. The tests listed below will
trouble to a part or circuit.
aid in isolating the trouble. First, localize the
trouble to a single stage or circuit, and then
(5) I n t e r m i t t e n t t r o u b l e s . I n a l l t h e s e
isolate the trouble within that circuit by volt-
tests, the possibility of intermittent
age, resistance, and continuity measurements.
troubles should not be overlooked.
19

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