Printing of the ACARS (or ATSU) Data not possible from the MCDU1

TASK 31-35-00-810-812-A
Printing of the ACARS (or ATSU) 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
AMM 23-24-34-000-001	Removal of the ACARS Management Unit (MU)
AMM 23-24-34-400-001	Installation of the ACARS Management Unit (MU)
ASM 313501
AMM 31-35-22-000-001	Removal of the Printer
AMM 31-35-22-400-001	Installation of the Printer
AMM 46-21-34-000-001	Removal of the Air Traffic Service Unit (ATSU)
AMM 46-21-34-400-001	Installation of the Air Traffic Service Unit (ATSU)

3. Fault Confirmation
Subtask 31-35-00-865-061-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
121VU	PTR/SPLY	6TW	J21
121VU	CFDS/CFDIU/SPLY	2TW	J18
121VU	CFDS/CFDIU/BACK/UP	8TW	J17
121VU	ATSU 1	3TX1	L16
121VU	ATSU 1/SWTG	5TX1	L15

Subtask 31-35-00-710-072-A

B. On the MCDU1, get the ACARS (or ATSU) page on the MCDU MENU and then push the line key adjacent to the PRINT indication.

4. Fault Isolation
Subtask 31-35-00-810-061-A

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

(1) If the fault continues (with ACARS-MU installed)

(a) If the fault continues:

do a check of the wiring from ACARS MU (1RB) pins AB/15E, 15F to printer (4TW) pins A/T, U 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 ACARS MU (1RB) pins AB/14A, 14B ASM 228604.

a If there is no continuity:

b If there is continuity:

(2) If the fault continues (with ATSU installed)

(a) If the fault continues:

do a check of the wiring from ATSU (1TX1) pins AA/1E, 1F to printer (4TW) pins A/T, U 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 ATSU (1TX1) pins AA/7E, 7F ASM 228604.

a If there is no continuity:

b If there is continuity:

Subtask 31-35-00-710-073-A

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

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