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TM 11-5820-890-20-2
2-132
2.2.
TROUBLESHOOTING FLOWCHARTS. Continued
Chart 37
NO RT-A MONITORING. CREWMEMBER C 2298
MONITOR SWITCH SET TO ALL.
(Sheet 1 of 3)
The RT in the SQ OFF position is used to
provide an ac signal in the system. The fixed
audio line will produce 1.5 TO 3.5 V ac.
Set up multimeter as an ac voltmeter. Use the
20 V range. Connect meter probes between
test points and chassis ground.
V
U
T
S
R
P
N
M
L
K
J
H
F
E
D
C
B
A
AM 1780 J505, J506, J507
P
N
M
L
B
C
D
E
F
G
H
J
K
A
NO
YES
2.0 TO 5.0
V ac
?
REPLACE AM 1780.
1. CONNECT SUSPECT CX 7060 TO AM 1780
J505 J507.
2. REMOVE CX 7060 FROM HULL BENDIX
CONNECTOR.
3. MEASURE AC VOLTAGE AT HULL BENDIX
CONNECTOR FROM PIN B TO PIN N (GND).
NO
YES
2.0 TO 5.0
V ac
?
1. REMOVE ALL CX 4723/7060 CABLES FROM
AM 1780 J504 J507.
2. MEASURE AC VOLTAGE AT PIN L OF AM 1780
J505 J507.
NO
YES
C 2297
SUSPECT
?
1
SH 2
2
SH 2
3
SH 3
START
HULL BENDIX
CONNECTOR
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