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TM 11-5820-890-20-2
2-117
2.2.
TROUBLESHOOTING FLOWCHARTS. Continued
Chart 32
NO RT-B MODULATION AT COMMANDER'S C 2298.
MONITOR SWITCH AT C.
(Sheet 5 of 5)
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 the ac
voltage. The change
indicates the presence of the
talk signal. The reading will
be less than 1 volt.
V
U
T
S
R
P
N
M
L
K
J
H
F
E
D
C
B
A
C 2298 J801, J804
NO
YES
SIDETONE
HEARD
?
1
SH 2
1. SET AM 1780 RAD TRANS TO CMDR AND
CREW.
2. AT CREWMEMBER C 2298, PRESS PTT AND
COUNT INTO HS WITH MONITOR AT C.
1. REMOVE CX 4723 FROM COMMANDER'S
C 2298 J801/J804.
2. CHECK CONTINUITY AT J801, PIN V
TO J804, PIN V.
NO
YES
OPEN
?
REPLACE COMMANDER'S
C 2298.
NO
YES
AC VOLT
CHANGE
?
REPLACE COMMANDER'S
C 2298.
1. OBSERVE CHANGE IN AC VOLTAGE AT
COMMANDER'S C 2298 J801/J804, PIN V TO
PIN A (GND) (SEE NOTE).
2. PRESS PTT AND WHISTLE SHARPLY
INTO HS.
REPLACE CX 4723.
4
SH 5
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