FDIMU Receives No Data from the DMC 1 or DMC 2

TASK 31-36-00-810-910-A
FDIMU Receives No Data from the DMC 1 or DMC 2

1. Possible Causes

wiring
DMC-1 [1WT1]
DMC-2 [1WT2]
DMU/FDIU (FDIMU) [10TV]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-36-00-740-012	Test of the Flight Data Interface and Management Unit (FDIMU)
AMM 31-36-34-000-002	Removal of the FDIU/DMU (FDIMU)
AMM 31-36-34-400-002	Installation of the FDIU/DMU (FDIMU)
ASM 313701
AMM 31-60-00-710-001	Operational Test of the EIS

3. Fault Confirmation
Subtask 31-36-00-740-192-A ** ON A/C NOT FOR ALL

A. Do the FDIMU (10TV) fault monitoring test (AIDS-part) AMM 31-36-00-740-012.

NOTE: Make sure that the circuit breakers 5TV, 10WT2, 21WT2 on the panel 121VU and 10WT1, 21WT1 on the panel 49VU are closed during the test.

4. Fault Isolation
Subtask 31-36-00-810-124-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message:

DMC1 (1WT1) / FDIMU (10TV) or
DMC2 (1WT2) / FDIMU (10TV)

(1) Do the operational test of the electronic instrument system AMM 31-60-00-710-001.

(a) If the test gives a different maintenance message, you can find the related trouble shooting procedure in the applicable Page Block 201.

(2) If the fault continues:

do a check and if necessary repair the wiring between the DMC-1 [1WT1] or DMC-2 [1WT2] and the DMU/FDIU (FDIMU) [10TV] ASM 313701:

DMC 1 Connector AB/1E to FDIMU Connector AA/6C
DMC 1 Connector AB/1F to FDIMU Connector AA/6D
or
DMC 2 Connector AB/1E to FDIMU Connector AB/6C
DMC 2 Connector AB/1F to FDIMU Connector AB/6D

(3) If the fault continues:

replace the FDIMU (10TV) AMM 31-36-34-000-002 and AMM 31-36-34-400-002.

Subtask 31-36-00-740-193-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:06 UTC