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TM 11-5820-890-20-2
2-107
2.2.
TROUBLESHOOTING FLOWCHARTS. Continued
Chart 30
NO RT-B MONITORING AT COMMANDER'S C 2298.
MONITOR SWITCH AT C.
(Sheet 1 of 4)
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.
NOTE:
Remove each cable one at a time
and check for rushing noise. The
rushing noise will return once the
short has been removed.
V
U
T
S
R
P
N
M
L
K
J
H
F
E
D
C
B
A
AM 1780 J504
NO
YES
3.0 TO 8.0
V ac
?
1. REMOVE COMMANDER'S CX 4723 FROM
AM 1780 J504.
2. MEASURE AC VOLTAGE AT AM 1780 J504 PIN
J TO PIN A (GND).
NO
YES
RUSHING
NOISE
?
1. REMOVE A CX 4723/7060 FROM AM 1780
J505, J506, OR J507.
2. LISTEN AT COMMANDER'S C 2298.
1
SH 2
2
SH 3
1
SH 2
NO
YES
ALL
CX 4723/7060
REMOVED
?
NOTE:
The driver's C 2297 is unable
to monitor or key RT-B in the
C position. The slip ring
assembly does not have the
proper connections.
START
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