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TM 11-5820-890-20-2
2-53
2.2.
TROUBLESHOOTING FLOWCHARTS. Continued
Chart 13
RT DISPLAY DOES NOT LIGHT WITH AM 1780 MAIN PWR SWITCH SET TO NORM.
(Sheet 1 of 3)
V
U
T
S
R
P
N
M
L
K
J
H
F
E
D
C
B
A
AM 1780 J501
J
H
P
K
S
R
N
M
L
F
E
D
B
A
C
V
U
T
MB J5
NO
YES
OPEN
?
REPLACE AM 1780.
1. REMOVE CX 13300 FROM AM 1780 J501.
2. CHECK CONTINUITY AT AM 1780
J501, PIN B TO PIN D.
NO
YES
22 TO 32
V dc
?
1
SH 2
2
SH 3
1. CONNECT CX 13300 TO AM 1780 J501.
2. SET CB1 TO OFF.
3. REMOVE VAA FROM MB.
4. MEASURE VOLTAGE AT MB J5,
PIN E TO PIN A (GND).
START
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