Loss of the BUS 1 Signal for the SEC 3

TASK 27-94-00-810-877-A
Loss of the BUS 1 Signal for the SEC 3

1. Possible Causes

SEC-3 [1CE3]
wiring of the DGO1 signal from the SEC 3 (1CE3) COM part to the first terminal block
wiring of the DGO1 signal from the SEC 3 (1CE3) MON part to the first terminal block

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 31-32-00-810-934-A	Failure of the Digital Links
ASM 279255
AMM 27-94-34-000-001	Removal of the SEC
AMM 27-94-34-400-001	Installation of the SEC
AMM 27-96-00-740-001	BITE Test of the EFCS (Ground Scanning)

3. Fault Confirmation
Subtask 27-94-00-740-122-A

A. Test
(1) Do the BITE test of the EFCS (ground scanning) AMM 27-96-00-740-001.

4. Fault Isolation
Subtask 27-94-00-810-114-A

A. If the BITE test gives the maintenance message:
SEC3 COM BUS1
or
SEC3 MON BUS1

(1) If the fault continues:

do the trouble shooting procedure (Ref. TSM TASK 31-32-00-810-934) related to the DGO digital output signal of the SEC 3 ASM 279255.

(2) If the fault continues:

do a check and repair the wiring of the DGO1 signal from the SEC 3 (1CE3) COM part to the first terminal block if the maintenance message is SEC 3 COM BUS 1 ASM 279255
or
do a check and repair the wiring of the DGO1 signal from the SEC 3 (1CE3) MON part to the first terminal block if the maintenance message is SEC 3 MOM BUS 1 ASM 279255.

Subtask 27-94-00-740-123-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:28:18 UTC