TM 11-6625-928-35
Item
Checks and corrective measures
Probable trouble
Trouble
symptom
No.
6 With COMM CONT TEST switch S3
a. Defective light DS2.
a. Check light DS2 and replace if
set to 2, and HEADSETS 2 switch
necessary (fig. 5-3).
S7 set to TRANSMIT, CONTROL
b. Check continuity of switch S3 and
b. Defective switch S3.
SIGNAL light DS2 fails to light.
replace if necessary (fig. 5-3).
c. Defective switch S7.
c. Check continuity of switch S7 and
replace if necessary (fig. 5-3).
d. Check continuity of associated
d. Defective wiring.
wiring and replace if necessary
e. Defective cable W9
replace if necessary (para 3-7f).
a. Check continuity of switch S3 and
a. Defective switch S3.
7 With COMM CONT TEST switch S3
replace if necessary (fig. 5-4).
set to 3, Headset-Microphone
H-101A/U (headset) connected to
b. Check continuity of associated
b. Defective wiring.
wiring and replace if necessary
HEADSETS 2 connector J16, a
l-k Hz signal of 2.7.5 volts rms
c. Defective cable W9.
amplitude applied to COMM
replace if necessary (para 37f).
CONT TEST INPUT connector
J19, and COMM CONT NO. 2
selector switch rotated to 1, 2, 3, 4,
and 5, no l-k Hz audio tone is heard
in Headset-Microphone H-101A/U
(headset).
a. Check continuity of switch S3 and
a. Defective switch S3.
8 With COMM CONT TEST switch
replace if necessary (fig. 54 ).
S3 set to 3, 4, 5, 6, 7, 8, 9, or 10,
b. Defective wiring.
b. Check continuity of associated
Headset-Microphone H-101A/U
wiring and replace if necessary
connected to HEADSETS 2 con-
nector J16, and a l-k Hz signal of
c. Defective cable W9.
2.75-volt rms amplitude applied
replace if necessary (para 3-7f).
to COMM CONT INPUT con-
nector J19, no l-k Hz audio tone is
heard in Headset-Microphone
H-101A/U (headset).
Note. COMM CONT NO. 2 AUX and NAV switches set to ON for COMM CONT TEST switch S3 positions 3, 5, and 6.
Item
No.
Checks and corrective measures
Trouble
symptom
Probable trouble
a. Check circuit breaker CB2 and
a. Defective DC POWER input
1 +27.5 volts not available at ADF/
replace if necessary (fig. 5-1).
circuit breaker CB2.
GYRO connector, J4.
b. Perform voltage and continuity
b. Defective wiring.
checks on associated wiring and
replace if necessary (fig. 5-1).
c. Check continuity of cable W22;
c. Defective interconnecting cable
replace if necessary (para 3-7p).
W22.
2 26 volts rms, 400 Hz not available at a . Defective AC POWER input
CB1 and replace if necessary (B,
ADF TEST RCVR connector J21
circuit breaker CB1.
with ADF TEST switch S4 set to 6.
b. Perform voltage and continuity
b. Defective wiring.
checks on associated wiring and
replace if necessary (B, fig. 5-5).
checks on transformer T1 and
replace if necessary (fig. 5-6).
d. Check continuity of switch S4 and
d. Defective switch S4.
replace if necessary (B, fig. 5-5).
e. Defective interconnecting cable
replace if necessary (para 3-7d).
W23.
3 Absence of either of following signals a . Defective wiring.
a. Check continuity of associated
wiring and replace if necessary (B,
at ADF/GYRO connector J4:
26 volts rms, 400 Hz.
Audio output.
b. Defective interconnecting cable
b. Check continuity of cables W4,
W4, W7, or W8.
W7, and W8. Replace if necessary
3-6
Change 3
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