TM 11-6625-928-35
Itam
No.
Trouble symptom
Checks and corrective measures
Probable trouble
4.
Absence of any one of following signals a . Defective wiring.
a . Check continuity of associated
at ADF RCVR TEST connector J5:
wiring and replace if necessary (B,
+28 volts.
b . Defective interconnecting cable
+15 volts regulated.
T u n i n g meter input
W4, W7, or W8.
W7, and W8. Replace if necessary
a . Check continuity of associated wir-
a . Defective wiring.
Absence of any one of following sig-
5
ing and replace if necessary (B, fig.
nals, at ADF TEST RCVR con-
nector J21 with ADF TEST switch
b . Defective interconnecting cable
S4 in position shown:
and W8; replace if necessary (para
W4, W7, or W8.
Switch
S4
Signal
pos
c . Check continuity of switch S4 and
c . Defective switch S4.
1 +28 volts.
replace if necessary (B, fig. 55).
2 26 volts rms, 400 Hz.
3 +15 volts regulated.
4 Tuning meter i n p u t
5 Audio output.
a
Test ID1351/A and replace if nec-
a
Defective Heading-Radio Bearing
Absence of radio bearing meter indi-
6
essary (para 3 16c, step 3).
Indicator ID-1351A.
cation on HOMING/ADF/CYRO
b . Check continuity of associated wir-
b . Defective wiring.
indicator.
ing and replace if necessary (B, fig.
c . Defective interconnecting cable
and W8; replace if necessary (para
W4, W7, or W8.
Unable to hear audio tone in Headset- a Defective COMM CONT NO. 1.
7
Microphone H-101A/U (headset)
System Control C-6533/ARC if
connected to HEADSETS 1 con-
necessary.
nector J15 with audio signal present
b. Check continuity of associated wir-
b Defective wiring.
at ADF TEST RCVR connector
ing and replace if necessary (B, fig.
J21, ADF TEST switch S4 set to 5,
and COMM CONT NO. 1 receiver
c. Check continuity of cable W20 or
c . Defective interconnecting cable
monitor switch NAV set to ON.
W21 and replace if necessary (para
W20 or W21.
3-70).
d. Check H-101A/U and replace if
d . Defective Headset-Microphone
necessary.
H-101A/U (headset).
a. Check continuity of associated wir-
a . Defective wiring.
Absence of any one of following sig-
8
ing and replace if necessary (B, fig.
nals at ADF CONTROL TEST
connector J6:
b . Defective interconnecting cable
28 volts, switched, pin B
W7, and W8; replace if necessary
+15 volts, pin F.
W4, W7, or W8.
+15 volts, pin L.
+15 vo1ts, pin M.
+15 volts, pin S.
Gain control output.
a. Check continuity of associated
a . Defective wiring.
Absence of any one of following
9
wiring and replace if necessary
signals at ADF TEST CONTROL
(B, fig. 5-5).
connector J22 with ADF TEST
b . Defective interconnecting cable
switch S4 in position shown:
W7, and W8; replace if necessary
W4, W7, or W78.
Switch
S4
pos
Signal
c. Check continuity of switch S4 and
c . Defective switch S4.
1 +28 volts, pin B.
replace if necessary (B, fig. 5-5).
2 +15 volts, pin F.
3 +15 volts, pin L.
4 +15 volts, pin M.
5 +15 volts, pin S.
6 Gain control output.
a. Check capacitor Cl and replace if
a. Defective capacitor C 1.
RF test signal is not present at
10
necessary (A, fig. 5-5).
SENSE ANTENNA connector J26
with ADF antenna function selector
necessary (A, fig. 55).
switch S5 set to ANT or COMP.
c. Check attenuator AT4 and replace
c . Defective attenuator AT4.
if necessary (A, fig. 5-5).
Change 3
3-7
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