Printing of the DMU (or FDIMU) Data not possible from the MCDU1

TASK 31-35-00-810-811-A
Printing of the DMU (or FDIMU) Data not possible from the MCDU1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 22-82-12-000-001	Removal of the MCDU
AMM 22-82-12-400-002	Installation of the MCDU
ASM 228604
ASM 313501
AMM 31-35-22-000-001	Removal of the Printer
AMM 31-35-22-400-001	Installation of the Printer
AMM 31-36-34-000-001	Removal of the Data Management Unit (DMU)
AMM 31-36-34-000-002	Removal of the FDIU/DMU (FDIMU)
AMM 31-36-34-400-001	Installation of the Data Management Unit (DMU)
AMM 31-36-34-400-002	Installation of the FDIU/DMU (FDIMU)

3. Fault Confirmation
Subtask 31-35-00-865-060-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AUTO FLT/MCDU/1	11CA1	B01
** ON A/C NOT FOR ALL
121VU	AIDS/DMU	4TV	K15
** ON A/C ALL
121VU	PTR/SPLY	6TW	J21
121VU	CFDS/CFDIU/SPLY	2TW	J18
121VU	CFDS/CFDIU/BACK/UP	8TW	J17
** ON A/C NOT FOR ALL
121VU	AIDS & RCDR/FDIMU	5TV	K15

Subtask 31-35-00-710-070-A

B. On the MCDU1, get the DMU page on the MCDU MENU and then push the line key adjacent to the PRINT indication.

4. Fault Isolation
Subtask 31-35-00-810-060-A

A. If it is not possible to print the DMU (or FDIMU) data on the printer (4TW):

(1) If the fault continues (with DMU installed):

(a) If the fault continues:

do a check of the wiring from DMU (1TV) pins AA/11E, 11F to printer (4TW) pins A/C, D ASM 313501.

1 If there is no continuity:

2 If there is continuity:

do a check of the wiring from MCDU1 (3CA1) pins A/27, 28 to DMU (1TV) pins AA/11A, 11B ASM 228604.

a If there is no continuity:

b If there is continuity:

(2) If the fault continues (with FDIMU installed):

(a) If the fault continues:

do a check of the wiring from FDIMU (10TV) pins AA/11E, 11F to printer (4TW) pins A/C, D ASM 313501.

1 If there is no continuity:

2 If there is continuity:

do a check of the wiring from MCDU1 (3CA1) pins A/27, 28 to FDIMU (10TV) pins AA/11A, 11B ASM 228604.

a If there is no continuity:

b If there is continuity:

Subtask 31-35-00-710-071-A

B. Do the action given in Para. 3.B.

[Rev.8 from Aug 2018] 2026.04.04 04:30:02 UTC