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Cable Assembly, Special Purpose, Electrical CS-4655/GRC
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TM-11-5820-498-35 Radio Sets AN/VRC-53 AN/VRC-64 AN/GRC-125 and AN/GRC-160 and Amplifier Power Supply GROUPS 0A-3633/GRC and 3633A/GRC Manual
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Connecting Dc Power to AM-2060(*) /GRC


TM 11-5820-498-35
CHAPTER 3
DS AND GS MAINTENANCE
AMPLIFIER-POWER SUPPLY GROUP OA-3633(*) /GRC
NOTE
Throughout these procedures, receiver-trans-
mitter refers to Receiver-Transmitter, Radio
RT­505/PRC-25 which is used in Radio Sets
AN/VRC-53 and AN/GRC-125, and to Re-
ceiver-Transmitter, Radio RT-841/PRC-77
which is used in Radio Sets AN/VRC-64 and
AN/GRC-160.  Both  receiver-transmitters
a r e used with Amplifier-Power Supply
Group OA-3633(*)/GRC which is also part of
these radio sets.
Section I. GENERAL TROUBLESHOOTING TECHNIQUES
3-1. Scope of DS and GS Maintenance
AM-2060(*)/GRC is covered in Paragraphs 3-8,
a. The maintenance procedures in this chapter
3-9, and 3-10. Some faults, such as burned out
are applicable to DS (direct support) and GS
resistors, arcing, and shorted relay coils and
(general support) maintenance facilities and sup-
transformer windings can often be located by
plement the organizational maintenance proce-
sight, smell, or hearing. The majority of the
dures described in TM 11-5820-498-12 for the
faults, however, must be isolated by checking
OA-3633(*)/GRC. The systematic troubleshoot-
voltages and resistances.
ing procedures which begin with the operational
b. Visual Inspection. The purpose of visual
and equipment performance checks that can be
inspection is to locate faults without testing or
performed at an organizational maintenance level
measuring circuits. All visual signs should be ob-
are carried to a higher level in this chapter.
served and an attempt made to localize the fault
b. Refer to paragraph 1-lb for a listing of
to a particular area.
publications that cover the DS and GS mainte-
c. Testing Procedure. After any repair of the
nance level of the components that are part of
CX-4655/GRC or AM-206(*)/GRC, always test
t h e AN/VRC-53, AN/VRC-64, AN/GRC-125,
it for satisfactory performance of all circuits be-
and AN/GRC­160.
fore returning the equipment to the user or plac-
c. Refer to paragraph 1-1c for a listing of pub-
ing it in repaired stock. Refer to paragaphs 3-16
lications that cover the DS and GS maintenance
through 8-21 for inspection and testing proce-
level of the equipment that is used in conjunction
dures. The procedures can also be used to check
with these radio sets.
the performance of the equipment before starting
to troubleshoot it.
3-2. Organization of Troubleshooting Proced-
ures
3-3. Test Equipment, Tools, Materials, and
a. General. The first step in servicing a defec-
Power Sources Required
tive OA-3633*/GRC is to localize the fault by
a. Test Equipment Required.
tracing the trouble to the CX-4655/GRC or to
Publication
Item
some part of the AM­2060(*)/GRC. The second
step is to isolate the fault. Isolation means trac-
Multimeter ME-26(*)/Ua . . . . . . .
TM  11-6625-200-15
TM 11-6625-683-15
Generator, Signal AN/URM-127
ing the fault to a defective part responsible for
Voltmeter, Electronic
the abnormal operation. Isolating a fault to a de-
M E - 8 0 ( * ) / U  b . . . . . . . . .  TM 11-6625-820-12
fective part on the plug-in assembly of the
Change 2
3-1


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