|
| |
TM 11-5820-890-20-2
2-55
2.2.
TROUBLESHOOTING FLOWCHARTS. Continued
Chart 13
RT DISPLAY DOES NOT LIGHT WITH AM 1780 MAIN PWR SWITCH SET TO NORM.
(Sheet 3 of 3)
MEASURE VOLTAGE AT MB J5, PIN B
TO PIN A (GND).
NO
YES
22 TO 32
V dc
?
REPLACE MB.
2
SH 3
NO
YES
12 TO 14
V dc
?
3
SH 3
1. INSTALL VAA IN MB.
2. REMOVE RT-A FROM VAA.
3. SET VAA CB1 TO ON.
4. MEASURE VOLTAGE AT VAA
J8, PIN F TO PIN A (GND).
REPLACE VAA.
REPLACE RT.
NO
YES
AM 7239
PRESENT*
?
3
SH 3
3
SH 3
* NOT AM 7239A OR AM 7239B.
J
H
P
K
S
R
N
M
L
F
E
D
B
A
C
V
U
T
MB J5
Z
Y
d
b
a
S
R
X
W
V
T
U
Q
P
N
M
L
K
J
F
E
D
C
B
A
G
H
VAA J8
|
