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TM 11-5820-890-20-2
2-67
2.2.
TROUBLESHOOTING FLOWCHARTS. Continued
Chart 22
PSA DS1 IS NOT LIT WITH AM 1780 MAIN PWR SET TO NORM.
(Sheet 1 of 5)
NOTE:
Make sure VAA DS1 is set
full ccw.
NOTE:
When operating PSA switch S1, the
PSA CB1 must be set to OFF and the
AM 1780 MAIN PWR switch must be set
to OFF. Switch S1 could be damaged if
power is not removed.
NO
YES
PSA
DS1 LIT
?
1. SET AM 1780 MAIN PWR TO OFF.
2. SET PSA CB1 TO OFF.
3. REMOVE RT.
4. SET PSA SWITCH S1 TO LCL.
5. SET PSA CB1 TO ON.
NO
YES
RT
DISPLAY
LIT
?
SET RT FCTN TO SQ ON.
1
SH 2
REPLACE PSA DS1.
1. REMOVE PSA FROM MB.
2. MEASURE VOLTAGE AT MB J5, PIN B,
TO PIN A (GND).
NO
YES
22 TO 32 V dc
?
REPLACE PSA.
J
H
P
K
S
R
N
M
L
F
E
D
B
A
C
V
U
T
MB J5
REPLACE MB.
START
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