FDIMU Receives No Data from the CFDS

TASK 31-36-00-810-908-A
FDIMU Receives No Data from the CFDS

1. Possible Causes

wiring
CFDIU [1TW]
DMU/FDIU (FDIMU) [10TV]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-32-00-740-002	BITE Test of the Centralized Fault Display Interface Unit (CFDIU)
AMM 31-36-00-740-012	Test of the Flight Data Interface and Management Unit (FDIMU)
ASM 313601
AMM 31-36-34-000-002	Removal of the FDIU/DMU (FDIMU)
AMM 31-36-34-400-002	Installation of the FDIU/DMU (FDIMU)

3. Fault Confirmation
Subtask 31-36-00-740-188-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, 2TW, 8TW on the panel 121VU are closed during the test.

4. Fault Isolation
Subtask 31-36-00-810-122-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message:

CFDIU (1TW) / FDIMU (10TV)

(1) Do the BITE test of the Central Fault Display Interface System (CFDIU) AMM 31-32-00-740-002.

(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 CFDIU [1TW] and the DMU/FDIU (FDIMU) [10TV] ASM 313601:

CFDIU Connector AA/2B to FDIMU Connector AB/5C
CFDIU Connector AA/2C to FDIMU Connector AB/5D
CFDIU Connector AB/3F to FDIMU Connector AA/11E
CFDIU Connector AB/3G to FDIMU Connector AA/11F
CFDIU Connector AB/11D to FDIMU Connector AB/4C
CFDIU Connector AB/11E to FDIMU Connector AA/4D

(3) If the fault continues:

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

Subtask 31-36-00-740-189-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