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TM 11-5820-890-20-2
2-99
2.2.
TROUBLESHOOTING FLOWCHARTS. Continued
Chart 28
NO RT-A MONITORING AT COMMANDER'S C 2298.
MONITOR SWITCH AT A.
(Sheet 1 of 6)
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
FROM PIN M TO PIN A (GND).
NO
YES
RUSHING
NOISE
?
1. REMOVE A CX 4723/7060 FROM THE AM 1780
J505, J506, OR J507.
2. LISTEN AT COMMANDER'S C 2298.
1
SH 2
2
SH 4
3
SH 3
NO
YES
ALL
CX 4723/7060
REMOVED
?
START
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