TM 11-6625-928-35
Item
No.
Trouble symptom
Probable trouble
Checks and corrective measures
1 + 27.5 volts not available at RADIO a. Defective circuit breaker CB2.
a. Check continuity of circuit breaker
SET NO. 1 connector J1 or RADIO
CB2 and replace if necessary (fig.
SET NO. 2 connector J2 with DC
POWER input circuit breaker CB2 b. Defective wiring.
b. Check continuity of associated
set to ON.
wiring and replace if necessary (fig.
c. Defective DC POWER connector
J28, connector Jl, or connector J2.
Jl, and J2; replace if necessary
W2, W3, W5 and W6; replace if
or W6.
necessary (para 3-7p, b, and d).
2 Tone not heard in HEADSETS 1
a. Defective COMM CONT NO. 1.
Headset-Microphone H-101A/U
with l audio input applied to RADIO
System Control C-6533/ARC if
SET NO. 1 connector J1- d.
necessary.
b. Defective wiring.
b. Check continuity of associated
wiring l nd replace if necessary (C,
c. Defective cable W20, W21, W2,
W3, W5 or W6.
W21, W2, W3, W5 and W6. Replace
if necessary (para 3-7o, b, and d).
d. Defective Headset-Microphone
d. Check H-101A/U and replace if
H-101A/U.
necessary (C, fig. 5-2).
e. Defective HEADSETS 1 connector e. Check continuity of connector J 15
and replace if necessary (C, fig. !&2).
J15.
3 No transmit audio output at RADIO a. Defective COMM CONT NO. 1.
SET NO. 1 connector J1-K. Audio
input to maintenance kit from Head-
System Control C-6533/ARC if
set-Microphone H-101A/U con-
necessary.
nected to HEADSETS 1 conneotor b. Defective wiring.
b. Check continuity of associated
J15, HEADSETS 1 switch S6 held
wiring and replace if necessary
to TRANSMIT, and RADIO AN-
(B, D, fig. 5-2).
TENNA FUNCTION switch S1 set c. Defective switch S6.
c. Check continuity of switch S6
to XCRV.
and replace if necessary (B, fig.
d. Defective switch S1.
d. Check continuity of switch S1
and replace if necessary (B, fig.
e. Defective cable W20, W21, W2,
W3, W5 or W6.
W21, W2, W3, W5 and W6;
replace if necessary (para 3-7o,
b, and d).
f . Defective relay Kl or
replace as required
related diodes.
(fig. 3-0, 3 of
5-2).
If transmit audio output is present at Check continuity from connector
4 No transmit control output signal (grd)
Pi-J, N, T and X to TB3-11.
RADIO SET NO. 1 connector J1-K
at RADIO SET NO. 1 connector Jl-h
Check continuity between TB3-11
(Item No. 3), trouble is in switch-
with RADIO ANTENNA FUNC-
and RADIO SET NO. 1 connector
ing circuit of COMM CONT NO. 1,
TION switch S1 set to XCVR, and
J1-h (B, fig. 5-2). If wiring is all
or associated wiring in maintenance
HEADSETS 1 switch S6 held to
right, replace Communication
kit.
TRANSMIT.
System Control C-6533/ARC.
a . See 3 f a b o v e .
a . See 3 f a b o v e .
5 Am or fm signal generator output
applied to maintenance kit SIGNAL
b. Defective coaxial adapter CP1,
INPUT connector J12 not present
CP6, or CP7. Defective attenuator
or of improper amplitude, at T/R
trouble. Relpace if necessary (A,
AT5.
ANTENNA connector J11 with
RADIO ANTENNA FUNCTION
c. Check continuity of associated
switch S1 set to XCVR, and RADIO c. Defective wiring.
wiring l nd replace if necessary (A
TEST switch S2 set to 1.
and B, fig. 5-2).
3-2
Change 6
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