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TM 11-5820-890-20-2
2-115
2.2.
TROUBLESHOOTING FLOWCHARTS. Continued
Chart 32
NO RT-B MODULATION AT COMMANDER'S C 2298.
MONITOR SWITCH AT C.
(Sheet 3 of 5)
J
H
P
K
S
R
N
M
L
F
E
D
B
A
C
V
U
T
MB J5
V
U
T
S
R
P
N
M
L
K
J
H
F
E
D
C
B
A
MB J4,
AM 1780 J504
A
D
B
C
E
F
K
S
U
T
L
H
M
V
R
P
VAA P1
N
J
3
SH 4
1. REMOVE CX 13300 FROM MB J4.
2. CHECK CONTINUITY AT MB, J4, PIN U
TO J5, PIN U.
NO
YES
OPEN
?
REPLACE MB.
NO
YES
SHORT
TO
GROUND
?
REPLACE AM 1780.
NO
YES
20 TO 28
KOHMS
?
REPLACE VAA.
1. CONNECT ALL CABLES TO AM 1780 J503,
J504 J507.
2. REMOVE VAA FROM MB.
3. MEASURE RESISTANCE AT VAA
J4, PIN D TO P1, PIN U.
CHECK CONTINUITY AT AM 1780 J504, PIN V
TO PIN A (GND).
2
SH 3
F
E
D
C
B
A
VAA J4
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