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TM 11-5820-890-20-2
2-156
2.2.
TROUBLESHOOTING FLOWCHARTS. Continued
Chart 43
NO RT MODULATION AT SRM FROM COMMANDER'S C 2298.
(Sheet 5 of 12)
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
AM 1780 J801, J804
1. CONNECT A CREWMEMBER C 2298 BACK
TO AM 1780 J505, J506, OR J507.
2. SET THE AM 1780 RAD TRANS TO
CDR AND CREW.
3. SET THE CREWMEMBER MONITOR TO ALL.
4. PRESS CREWMEMBER PTT AND COUNT
INTO HS.
NO
YES
AC
VOLTAGE
CHANGE
?
6
SH 10
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 7
8
SH 6
2
SH 5
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