|
| |
TM 11-5820-890-20-2
2-36
2.2.
TROUBLESHOOTING FLOWCHARTS. Continued
Chart 6
AM 1780 RELAYS DO NOT CLICK AND SIDETONE IS HEARD.
INTERCOM CONTINUOUSLY KEYED WHILE CHECKING A C 2298 OR C 2297.
(Sheet 1 of 2)
NOTE:
Remove cables one at a time to
ensure isolation of the short. The
intercom stops keying once the
short is removed.
The short In the intercom keying
line is now isolated to either the
C 2297 and its associated wiring,
or C 2298 and its associated
cable.
V
U
T
S
R
P
N
M
L
K
J
H
F
E
D
C
B
A
C 2298 J801, J804
REMOVE CX 4723/7060 ONE AT A TIME FROM
J504, J505, J506, OR J507 OF AM 1780.
NO
YES
SHORT TO
GROUND
?
REPLACE C 2298.
NO
YES
C 2297
ISOLATED
?
1
SH 2
NO
YES
INTERCOM
STILL KEYED
?
REPLACE AM 1780.
NO
YES
ALL
CX 4723/7060
REMOVED
?
1. REMOVE CX 4723 FROM C 2298 J801/J804.
2. CHECK CONTINUITY AT J801/J804,
PIN H TO PIN A (GND).
REPLACE CX 4723.
START
|
