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TM 11-5820-890-20-2
4-12
4.2.
TROUBLESHOOTING FLOWCHARTS. Continued
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/J7 OR J2
CHART 1
RCU DISPLAY READS •OPEN" DURING SELF TEST.
(Sheet 8 of 8)
1. REMOVE RCU VAA OR PSA FROM MB.
2. IF RCU-A, THEN CHECK CONTINUITY AT
RCU VAA E1A TO E2A.
3. IF RCU-B, THEN CHECK CONTINUITY AT
RCU VAA E1B TO E2B.
4. IF RCU IS INSTALLED IN A PSA, THEN
CHECK CONTINUITY AT RCU PSA E1 TO E2.
NO
YES
OPEN
?
REPLACE RCU.
REPLACE VAA OR PSA.
NO
YES
OPEN
?
1. IF RCU-A, THEN CHECK CONTINUITY AT
RCU VAA J8, PIN Y TO PIN a.
2. IF RCU-B, THEN CHECK CONTINUITY AT
RCU VAA J7, PIN Y TO PIN a.
3. IF RCU IS INSTALLED IN A PSA, THEN
CHECK CONTINUITY AT PSA
J2, PIN Y TO PIN a.
REPLACE VAA OR PSA.
7
SH 8
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