TM 11-6625-928-35
c. Communication System Control Test Circuit Troubleshooting Chart (fig. 5-1, 5-3, and 5-4).
Item
No.
Trouble
symptom
Probable trouble
Checks and corrective measures
a. Defective circuit breaker CB2.
1 +27.5 volts not available at COMM
CONT NO. 2 connector J3 with
CB2 and replace if necessary (fig.
with DC POWER input circuit
breaker CB2 set to ON.
b. Defective wiring.
wiring and replace if necessary (fig.
c. Defective DC POWER connectors
c. Check continuity of connectors
J28 and J3 and replace if necessary
J28 or connector J3.
d. Defective cable W22.
d. C h e c k c o n t i n u i t y o f
cable CX-10886/AR and
replace if necessary
a Test COMM CONT NO. 1 and re-
a . Defective COMM CONT NO. 1.
2 Sound not heard in Headset-Micro-
place Communication System Con-
phone H101A/U (headset), con-
trol C-6533/ARC if necessary
nected to HEADSETS 1 connector
J15, with an audio input applied to
b. Check continuity of switch S7 and
b . Defective switch S7.
Headset-Microphone H-101A/U
replace if necessary (fig. 5-3).
(microphone), connected to HEAD-
c . Defective wiring.
SETS 2 connector J16, and HEAD-
and replace if necessary (fig. 5-3).
SETS 2 switch S7 set to INTER-
d. Check continuity of cables W9,
d . Defective cable W9, W20, or W21
COM.
W20, and W21; replace if necessary
a. Test COMM CONT NO. 1 and
a . Defective COMM CONT NO. 1.
3 Sound not heard in Headset-Micro-
replace Communication System
phone H-101A/U (headset), con-
Control C-6533/ARC if necessary
nected to HEADSETS 2 connector
J16, with an audio input applied to
b. Check continuity of switch S6 and
b . Defective switch S6.
Headset-Microphone H-101A/U
replace if necessary (fig. 5-4).
(microphone), connected to HEAD-
c . Defective wiring.
SETS 1 connector J15, and HEAD-
wiring and replace if necessary
SETS 1 switch S6 set to INTER-
COM.
d. Check continuity of cables W9,
d . Defective cable W9, W20; or W21.
W20, and W21; replace if necessary
a. Check continuity of switch S7
4 With COMM CONT TEST switch S3
a . Defective switch S7.
and replace if necessary (fig. 5-3).
set to 1, HEADSETS 2 switch S7
b. Check continuity of switch S3
set to INTERCOM, and a reference
b . Defective switch S3.
and replace if necessary (fig. 5-3).
audio oscillator signal applied to
COMM CONT TEST INPUT
c . Defective wiring.
connector J19, internal microphone
wiring and replace if necessary
amplifier signals in C-6533/ARC
d. Check continuity of cable W9 and
under test are missing, or below,
d . Defective cable W9.
minimum tolerances.
replace if necessary (para 37f).
a. Check continuity of switch S7 and
a. Defective switch S7.
5 With COMM CONT TEST switch
rcplace if necessary (fig. 5-3).
S3 set to 2, HEADSETS 2 switch
S7 set to TRANSMIT, and a l-kHz
b. Check continuity of switch S3 and
b . Defective switch S3.
signal of 0.6-volt rms amplitude
replace if necessary (fig. 5-3).
c. Check continuity of cable W9 and
applied to COMM CONT TEST
c . Defective cable W9.
INPUJT connector J19, output at
replace if necessary (Pam 37f).
d. Check R2 and continuity of
C O M M CONT TEST OUTPUT
d . Defective wiring or resistor R2.
associatcd wiring; replace if
connector J20 is below 2.75 volts
rms. H-l01A/U
necessary (fig. 53).
is conn-
e. Disconnect H-101A/U W20 or
ected to HEADSETS 2
W21 when applying signal to
connector J16 by cable
connector J 19.
CX-10888/U. Disconnect
H-101A/U or CX-l0888/U
when applying signal to
connector J19.
Change 3
3-5
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