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TM 11-5820-890-20-2
2-39
2.2.
TROUBLESHOOTING FLOWCHARTS. Continued
CHART 8
AM 1780 RELAYS CLICK AND NO SIDETONE HEARD
AT A PARTICULAR POSITION OF MONITOR SWITCH.
(Sheet 1 of 4)
POSITION
PIN
ALL
A
INT
C
L
M
E
B
B
A
G
J
GND
A
N
NOTE:
Circuit disturbing is used to induce
noise into the system. To circuit disturb,
set up the multimeter as an ohmmeter.
Use the digital multimeter in the 200
range.
Connect the ground probe to the
indicated pin. Then, quickly lift the
probe.
Repeat as needed and listen for the
clicking sound in the handset. Only the
200 scale has an adequate voltage
to cause the clicking sound.
This chart checks for opens on the
listen lines.
CX 4723/7060
V
U
T
S
R
P
N
M
L
K
J
H
F
E
D
C
B
A
1. SET FAULTY C 2297/C 2298 MONITOR
SWITCH TO POSITION THAT FAILED.
2. REMOVE THE CX 4723/7060 FROM AM 1780
J504, J505, J506, OR J507.
3. DETERMINE APPROPRIATE PIN FROM
CHART FOR CIRCUIT DISTURBING.
4. CIRCUIT DISTURB PIN AT CX 7060
CONNECTOR.
NO
YES
CLICKING
SOUND HEARD
IN HS
?
1
SH 2
REPLACE AM 1780.
NO
YES
C 2297
FAILED
?
2
SH 3
START
CX 4723/7060
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