TM 1-1520-238-T-7
11–120
11–15.
FORCE TRIM – DOES NOT ENGAGE (cont)
11–15
7. With relay (A402)XK1–9/10 installed, detach
P488. Check for 28 VDC at (A402)J18–A13.
Is voltage present?
YES
Go to step 8.
NO
Repair open wire between
(A402):
J18–A14 and K1–9/10–C3,
J18–A13 and K1–9/10–B3.
Go to paragraph 11–12.
8. Check for open between (A402):
J24–A14 and J24–B10.
Does open exist?
YES
Repair open wire between
(A402):
J24–A14 and K1–9/10–A3,
J24–B10 and TB3–9–K.
Go to paragraph 11–12.
NO
Go to step 9.
9. Attach P488 and P441. Check for 28 VDC at:
J1047–A,
J1048–A,
J1049–A.
Are all voltages present?
YES
Go to step 10.
NO
Repair open wire between:
P488–A14 and J1047–A,
P488–A13 and J1049–A,
P441–A14 and J1048–A.
Go to paragraph 11–12.
10. Check for open between:
J1047–B and ground,
J1048–B and ground,
J1049–B and ground.
Does open exist?
YES
Repair open wire between:
J1047–B and (A402)GS7–B,
J1048–B and (A402)GS7–C,
J1049–B and (A402)GS7–A. Go
to paragraph 11–12.
NO
Replace appropriate magnetic
brake:
Lateral = J1047–A,
Directional = J1048–A,
Longitudinal = J1049–A.
Go to paragraph 11–12.
11. Check for short between P423–B7 and
P423–B15.
Does short exist?
YES
Go to step 18.
NO
Go to step 12.
12. Check for short between P423–B7 and
P423–B16.
Does short exist?
YES
Go to step 17.
NO
Go to step 13.
13. Check for short between P423–B6 and
P423–B14.
Does short exist?
YES
Go to step 15.
NO
Go to step 14.
14. Check for short between P686–116 and
P686–117.
Does short exist?
YES
Repair shorted wire between
P686–116 and
(A402)TB2–29–H.
Go to paragraph 11–12.
NO
Replace DASEC
(TM 1-1520-238-23).
