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TM 11-5820-890-20-2
2-75
2.2.
TROUBLESHOOTING FLOWCHARTS. Continued
Chart 25
NO RT-A MONITORING AT COMMANDER'S C 2298.
MONITOR SWITCH AT ALL POSITION.
(Sheet 1 of 7)
NOTE:
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 from
the radio.
Set up multimeter as an ac
voltmeter. Connect meter probes
between test points and chassis
ground.
NOTE:
Remove each cable 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
J504
NO
YES
RUSHING NOISE
HEARD
?
1. REMOVE A CX 4723/7060 FROM AM 1780
J505, J506, OR J507.
2. LISTEN AT COMMANDER'S C 2298.
NO
YES
ALL CONTROL
CABLES
REMOVED
?
1
SH 2
1. REMOVE COMMANDER' S CX 4723 FROM
AM 1780 J504.
2. MEASURE AC VOLTAGE AT AM 1780 J504,
PIN L TO PIN A (GND).
NO
YES
2.0 TO 5.0
V ac
?
2
SH 4
3
SH 3
START
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