TM 9-4120-385-14
Disconnect all leads to capacitors (C2) (67) and (C4) (55) and relay (K10) (68)
8.
and remove bracket.
9.
Remove screw (53) to remove relay (68).
10. Remove screw (53) and nut (12), each securing one of two clamps (54) and
capacitor (C4) (55).
11. Remove resistor (56) from capacitor (55).
12. Remove four screws (3) and nuts (19) securing clamp (66) and capacitor (C2)
(67).
13. Floating nuts (52) may be removed by removing two rivets (51).
b.
INSPECTION.
1.
2.
Check relays for external damage.
Check brackets for damage.
3.
Check capacitors, clamps, and resistor for external damage.
4.
TESTING.
c.
Apply 28 Vdc to terminals X1 and X2, positive to X1, negative to X2.
1.
Check continuity of pairs A1A2, B1B2, and C1C2. Continuity should be
2.
indicated.
Remove the 28 Vdc from terminals X1 and X2. Continuity should not be
3.
indicated.
4.
Again, apply 28 Vdc to terminals X1 and X2.
Check continuity of pairs B2-B3 and C2-C3. Continuity should not be
5.
indicated.
Remove the 28 Vdc from terminals X1 and X2. Continuity should be indicated.
6.
7.