Loss of the Servo Motor 2 Signal on the THS Actuator for the SEC 1

TASK 27-94-00-810-838-A
Loss of the Servo Motor 2 Signal on the THS Actuator for the SEC 1

1. Possible Causes

SEC-1 [1CE1]
wiring of the K12-1 and 2 signal from the SEC 1 (1CE1) to the SEC 1 (1CE1)
wiring of the K12-1B and 2B signal from the SEC 1 (1CE1) to the first terminal block

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 279412
AMM 27-94-34-000-001	Removal of the SEC
AMM 27-94-34-400-001	Installation of the SEC
AMM 27-96-00-710-022	Operational Test of the THS Actuator Electrical Control (Activation for BITE Test)
AMM 27-96-00-740-001	BITE Test of the EFCS (Ground Scanning)

3. Fault Confirmation
Subtask 27-94-00-700-092-A

A. Test
(1) Do the operational test of the THS actuator electrical control AMM 27-96-00-710-022.

NOTE: Do the ground setting only with the SEC 1.

(2) Do the BITE test of the EFCS (Ground Scanning) AMM 27-96-00-740-001.

4. Fault Isolation
Subtask 27-94-00-810-087-A

A. If the BITE test gives the maintenance message:
SEC1 OR WIRING TO THS ACTR SERVO MOT2 9CE

(1) If the fault continues:

do a check of the wiring of the K12-1 and 2 signal from the SEC 1 (1CE1) to the SEC 1 (1CE1), ASM 279412.

(a) If there is no continuity, repair the wiring.
(b) If there is continuity:

do a check and repair the wiring of the K12-1B and 2B signal from the SEC 1 (1CE1) to the first terminal block, ASM 279412.

Subtask 27-94-00-700-093-A

B. Do the tests given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:28:14 UTC