Loss of the DSDL PFD MASTER or DSDL PFD FDBK Bus Detected by the DMC1

TASK 31-63-81-810-825-A
Loss of the DSDL PFD MASTER or DSDL PFD FDBK Bus Detected by the DMC1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-60-00-740-002	Perform Electronic Instrument System (EIS) Input Test
ASM 316104
AMM 31-63-22-000-001	Removal of the Display Unit
AMM 31-63-22-400-001	Installation of the Display Unit
AMM 31-63-34-000-001	Removal of the DMC
AMM 31-63-34-400-001	Installation of the DMC

3. Fault Confirmation
Subtask 31-63-81-740-098-A ** ON A/C NOT FOR ALL

A. Test
Do the EIS input test AMM 31-60-00-740-002.

4. Fault Isolation
Subtask 31-63-81-810-079-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message DMC1 : NO CHECK ATT MSG:

on the panel 301VU, push the CAPT PFD/ND XFR pushbutton switch (9WT1) to get the PFD image on the CAPT ND
do the test given in Para. 3.

(1) If this test gives the maintenance message DMC1 : NO CHECK ATT MSG:

(a) If the fault continues:

do a check of the wiring from the DMC1 (1WT1) pins AB/9B, 9C to the first terminal block ASM 316104.

1 If there is no continuity:

2 If there is continuity:

do a check and repair the wiring from the DMC1 (1WT1) pins AB/9D, 9E to the first terminal block ASM 316104.

(2) If this test gives no maintenance message:

(a) If the fault continues:

do a check of the wiring from the CAPT PFD (2WT1) pins AA/35, 36 to the first terminal block ASM 316104.

1 If there is no continuity:

2 If there is continuity:

do a check and repair the wiring from the CAPT PFD (2WT1) pins AA/38, 39 to the first terminal block ASM 316104.

Subtask 31-63-81-740-099-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:56 UTC