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TM 11-5820-890-20-2
2-111
2.2.
TROUBLESHOOTING FLOWCHARTS. Continued
Chart 31
RT-B WILL NOT KEY FROM COMMANDER'S C 2298.
MONITOR SWITCH SET TO C.
(Sheet 1 of 2)
This step checks for an open
in the commander's RT-B
keying line.
This voltage is present from a
biasing circuit in the 1 watt
audio board of the VAA.
V
U
T
S
R
P
N
M
L
K
J
H
F
E
D
C
B
A
AM 1780 J504
V
U
T
S
R
P
N
M
L
K
J
H
F
E
D
C
B
A
1. CONNECT COMMANDER'S CX 4723 TO J504.
2. REMOVE THE CX 4723 FROM C 2298
J801/J804.
3. MEASURE VOLTAGE AT CX 4723,
PIN F TO PIN A (GND).
REPLACE COMMANDER'S
C 2298.
NO
YES
1.0 TO 2.5
V dc
?
REPLACE CX 4723.
1. REMOVE COMMANDER'S CX 4723 FROM
J504 OF AM 1780.
2. MEASURE VOLTAGE AT AM 1780 J504,
PIN F TO PIN A (GND).
NO
YES
1.0 TO 2.5
V dc
?
1
SH 2
START
CX 4723
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