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Page Title:
Chapter 3. GENERAL SUPPORT MAINTENANCE |
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 TM 11-6625-601-34
CHAPTER 3
GENERAL SUPPORT MAINTENANCE
Section I. INTRODUCTION
3-1. Scope of General Support Main-
(3) Adjustment
tenance
(4) Testing
a. General support maintenance includes all
3-2. Test Equipment Required
t h e techniques o u t l i n e d for direct support
maintenance plug any special or additional
general support maintenance of Maintenance
techniques required to isolate a defective part.
Kit, Electronic Equipment MK-733/ARC-54 and
The maintenance consists of replacing piece
also lists the associated technical manuals.
parts on audio amplifier Al boards, replacement
of RF power meter Ml, directional coupler DC1,
Table 3-1. Test Equipment Required for General
attenuator/dummy load AT1, blower B1, and
Support Maintenance
repair of the counter assembly. In some cases,
Test Equipment
Technical Manual
a trouble can be localized by the general support
Generator, Signal AN/URM-127.
TM
11-6625-683-15.
repairman to a particular functional circuit in
TM
11-6625-573-15.
the test set or simulator by use of the operating
Multimeter TS-352B/U.
TM
11-6625-366-15.
procedures in the monthly preventive mainte-
Power Supply PP-351/U.
TM
11-5121.
Test Set, Transistor TS-1836/U.
nance c h e c k s and services c h a r t i n T M
TM
11-6625-539-15.
Voltmeter, Electronic AN/URM-
TM
11-6625-524-14.
116625-601-12. In other cases, however, a trou-
145.
ble
is
localized
while
performing
the
Voltmeter, Electronic ME-30/U.
TM 11-6625-320-12.
AN/ARC-54 unit test procedures.
Tool Kit, Electronic Equipment
SB 11-604.
b. This chapter contains sections concerning:
TK-105/G.
Wattmeter AN/URM-120.
(1) Troubleshooting
TM 11-6625-446-15.
Radio Set AN/ARC-54.
TM 11-5821-244-12.
(2) Repairs and Replacement
Section Il. General Support Troubleshooting
3-3. Troubleshooting Procedures
a. Voltage Measurements. The voltage read-
ings in table 32 were obtained under the condi-
For troubleshooting procedures at the general
tions specified below. A l w a y s make voltage
support maintenance category, follow the steps
measurements under these same conditions or
outlined in chapter 2, paragraph 2-3.
the readings obtained may be inaccurate. Make
3-4. Voltage and Resistance Measure-
all voltage measurements with a vtvm that has
ments
an input impedence of at least 10 megohms
(Voltmeter, Meter ME-30A/U, or equivalent).
Normal voltage and resistance measurements
Connect the dc common clip to the ac ground
taken at the base, collector and emitter of the
clip of the vtvm to chassis ground of the unit
b l o w e r inverter (part of Test Set, Radio
under test. Voltage measurements for blower
TS-967/ARC-54), are presented in the table in
inverter
(part
of
Test
Set,
Radio
TS-1967/ARC-54) are taken by following the
ments of the audio amplifiers in the test set and
procedures outlined below:
simulator are presented in the tables in parag-
raph 25.
(1) Apply +27.5 volts dc to POWER jack J32.
CAUTION
(2) Set the POWER circuit breaker to ON.
When measuring voltages, use tape or
( 3 ) Set XMIT-RCVR-PTT switch S6 to
s l e e v i n g (spaghetti) to insulate the
XMIT.
entire test prod, except for the extreme
( 4 ) Set TEST FUNCTION SELECTOR
tip. A momentary short circuit can ruin
switch S11 to TEST SET.
a transistor.
3-1
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