|
| |
TM 11-5820-890-20-2
2-105
2.2.
TROUBLESHOOTING FLOWCHARTS. Continued
Chart 29
NO RT-B MONITORING AT COMMANDER'S C 2298.
MONITOR SWITCH IN THE ALL POSITION.
(Sheet 1 of 2)
The RT in the SQ OFF
position is used to provide an
ac signal in the system. The
fixed audio line will produce
1.5 to 3.5 V ac.
Set up multimeter as an ac
voltmeter. Use the 20 V
range. Connect meter probes
between test points and
chassis ground.
V
U
T
S
R
P
N
M
L
K
J
H
F
E
D
C
B
A
MB J4
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
NO
YES
1.5 TO 3.5
V ac
?
1. REMOVE VAA FROM MB.
2. REMOVE CX 13300 FROM MB J4.
3. CHECK CONTINUITY AT MB J4, PIN K
TO J2 PIN A (GND).
REPLACE AM 1780.
1. REMOVE CX 13300 FROM AM 1780 J503.
2. MEASURE AC VOLTAGE AT CX 13300, PIN K
TO PIN A (GND).
CHECK CONTINUITY AT MB J4, PIN K
TO J5, PIN P.
NO
YES
SHORT
TO
GROUND
?
REPLACE MB.
NO
YES
OPEN
?
1
SH 2
REPLACE MB.
START
D
C
B
A
MB J2
CX 13300
|
