No Data from a Light Unit

TASK 33-21-00-810-807-A
No Data from a Light Unit

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 23-73-00-740-012	Ground Scanning of the Cabin Intercommunication Data System (CIDS)
AMM 23-73-46-000-001	Removal of the Decoder/Encoder Unit A (200RH)
AMM 23-73-46-400-001	Installation of the Decoder/Encoder Unit A (200RH)
ASM 332101
ASM 332102
ASM 332103
AMM 33-21-11-000-001	Removal of the Ballast Unit, Lampholder and Fluorescent Tube
AMM 33-21-11-000-802	Removal of the Cabin LED Unit (CLEDU)
AMM 33-21-11-400-001	Installation of the Ballast Unit, Lampholder and Fluorescent Tube
AMM 33-21-11-400-802	Installation of the Cabin LED Unit (CLEDU)

3. Fault Confirmation
Subtask 33-21-00-710-068-A ** ON A/C NOT FOR ALL

A. Do the CIDS Ground Scanning AMM 23-73-00-740-012.

4. Fault Isolation
Subtask 33-21-00-810-063-A ** ON A/C NOT FOR ALL

A. If the Ground Scanning gives the maintenance message:

BU<APPL.AREA>SRXX X/DEU A (200RHYY)

(1) If the fault continues:

do a check of the WIRING between the Ballast Unit and the related DEU A
ASM 332101, ASM 332102 or ASM 332103.

(a) If the fault continues:

Subtask 33-21-00-810-063-B ** ON A/C NOT FOR ALL

A. If the Ground Scanning gives the maintenance message:

BU<APPL.AREA>SRXX X/DEU A (200RHYY)

(1) If the fault continues:

do a check of the WIRING between the CLEDU and the related DEU A
ASM 332101, ASM 332102 or ASM 332103.

(a) If the fault continues:

Subtask 33-21-00-710-069-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:31:55 UTC