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TM 11-5820-890-20-2
2-135
2.2.
TROUBLESHOOTING FLOWCHARTS. Continued
Chart 38
NO RT-B MONITORING. CREWMEMBER C 2298
MONITOR SWITCH SET TO C.
(Sheet 1 of 1)
The RT in the SQ OFF position is used
to provide an ac signal in the system.
The variable audio line 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
V
U
T
S
R
P
N
M
L
K
J
H
F
E
D
C
B
A
NO
YES
3.0 TO 8.0
V ac
?
REPLACE AM 1780.
1. CONNECT THE SUSPECT CX 4723 TO
AM 1780 J505 J507.
2. REMOVE CX 4723 FROM CREWMEMBER
C 2298 J801/J804.
3. MEASURE AC VOLTAGE AT CX 4723,
PIN J TO PIN A (GND).
1. REMOVE ALL CX 4723 FROM AM 1780
J504 J507.
2. MEASURE AC VOLTAGE AT AM 1780
J505 J507, PIN J TO PIN A (GND).
NO
YES
3.0 TO 8.0
V ac
?
REPLACE CX 4723.
REPLACE C 2298.
START
CX 4723
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