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TM 11-5820-890-20-2
2-89
2.2.
TROUBLESHOOTING FLOWCHARTS. Continued
Chart 27
NO RT-A MODULATION FROM COMMANDER'S C 2298.
(Sheet 5 of 14)
Set up multimeter as an ac
voltmeter. Use the lowest range.
Connect meter probes between
signal line or a test point and
chassis ground. Key the handset
and whistle into the mic. Look at
the meter and note any change
in ac voltage. The change
indicates the presence of the talk
signal. The reading will be less
than 1 volt ac.
V
U
T
S
R
P
N
M
L
K
J
H
F
E
D
C
B
A
C 2298 J801, J804
V
U
T
S
R
P
N
M
L
K
J
H
F
E
D
C
B
A
AM 1780 J504, J505, J506, J507
1. CONNECT A CREWMEMBER C 2298 BACK
TO AM 1780 J505, J506, OR J507.
2. SET AM 1780 RAD TRANS SWITCH TO CDR
AND CREW.
3. SET CREWMEMBER MONITOR TO ALL.
4. PRESS CREWMEMBER PTT AND COUNT
INTO THE HS.
NO
YES
AC VOLT
CHANGE
?
6
SH 11
1. OBSERVE CHANGE IN AC VOLTAGE AT
COMMANDER'S C 2298 J801/J804, PIN K TO
PIN A (GND) (SEE NOTE).
2. PRESS PTT AND WHISTLE SHARPLY INTO
HS.
NO
YES
SIDETONE
HEARD
?
7
SH 6
1. REMOVE CREWMEMBER CX 4723 FROM
AM 1780 J505, J506, OR J507.
2. REMOVE COMMANDER'S CX 4723 FROM
AM 1780 J504.
3. CHECK CONTINUITY AT AM 1780 J505, J506,
OR J507, PIN K TO J504, PIN K.
8
SH 8
3
SH 5
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