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TM 11-5820-890-20-2
2-120
2.2.
TROUBLESHOOTING FLOWCHARTS. Continued
Chart 34
NO RT-A MONITORING. CREWMEMBER'S C 2298 MONITOR SWITCH TO A.
(Sheet 1 of 3)
The RT in the SQ OFF position is used to
provide an AC signal in the system. The
variable audio will produce 3.0 to 8.0 V ac
when the volume control is set full cw.
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
3.0 TO 8.0
V ac
?
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 A TO PIN N (GND).
REPLACE AM 1780.
NO
YES
C 2297
SUSPECT
?
1
SH 2
1. REMOVE ALL CX 4723/7060 FROM AM 1780
J504 J507.
2. MEASURE AC VOLTAGE AT AM 1780
J505 J507, PIN M.
NO
YES
3.0 TO 8.0
V ac
?
2
SH 2
3
SH 3
START
HULL BENDIX
CONNECTOR
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