Removal of the System Control Unit (SCU)

TASK 23-36-34-000-001-A
Removal of the System Control Unit (SCU)

ZONE: 220
FIN: 11MH ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
220	FWD CAB UTILITY AREAS

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
Control Panel ** ON A/C NOT FOR ALL
System Control Unit ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 23-36-34-861-050-A ** ON A/C NOT FOR ALL

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 23-36-34-010-051-A ** ON A/C NOT FOR ALL

B. Get Access

Control Panel ** ON A/C NOT FOR ALL

(1) Open the doors of the overhead stowage compartment and the Video Control Center (VCC) (8).
(2) Remove the closeout panel (2):
(a) Hold the panel (2).
(b) Release the captive screws (3).
(c) Remove the panel (2) from the VCC (8).

Subtask 23-36-34-865-062-A ** ON A/C NOT FOR ALL

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
2000VU	PES-VIDEO-CABIN-RH AFT	25MH	C06
2000VU	PES-VIDEO-CABIN-LH	23MH	C05
2000VU	PES-VIDEO-CABIN-RH FWD	24MH	C04
2000VU	PES-VIDEO-CABIN-LH FWD	22MH	C03
2000VU	PES-VIDEO-CONTROL-VCC	21MH	C02
** ON A/C NOT FOR ALL
2000VU	PES-VIDEO-CONTROL-MAIN	20MH	C01
** ON A/C NOT FOR ALL
2000VU	PES-VIDEO-CABIN AFT-RH	25MH	C06
2000VU	PES-VIDEO-CABIN AFT-LH	23MH	C05
2000VU	PES-VIDEO-CABIN FWD-RH	24MH	C04
2000VU	PES-VIDEO-CABIN FWD-LH	22MH	C03
2000VU	PES-VIDEO-CONTROL-VCC-DS/C	21MH	C02

4. Procedure
Subtask 23-36-34-020-050-K ** ON A/C NOT FOR ALL

A. Removal of the System Control Unit (SCU)

System Control Unit ** ON A/C NOT FOR ALL

(1) Open the doors of the left forward stowage compartment between FR20 and FR23.
(2) Open the flap on the front end of the left overhead stowage compartment for access to the video control center.
(3) Remove the cover (5) to get access to the electrical connectors (6).
(4) Disconnect the electrical connectors (6).
(5) Loosen the knurled screws (2).
(6) Carefully remove the SCU (3) together with the adaptor plate (4) out of the rack (1).
(7) Loosen the screws (7) and remove the SCU (3) from the adaptor plate (4).
(8) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.

Subtask 23-36-34-020-050-T ** ON A/C NOT FOR ALL

A. Removal of the Control Panel (CP)

Control Panel ** ON A/C NOT FOR ALL

(1) Remove the nut (10) and the bonding cable (9) from the mounting plate (4).
(2) Release the captive screws (7) that attach the mounting plate (4) to the VCC (8).

CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE COMPONENT DURING THE PROCEDURE. IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO COMPONENT.

(3) Carefully lift the CP (1) assembly and disconnect the electrical connectors (6).
(4) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(5) Remove the screws (5) that attach the CP (1) to the mounting plate (4).
(6) Remove the mounting plate (4) from the CP (1).
(7) Keep the parts for the subsequent installation procedure.

[Rev.10 from 2021] 2026.04.01 05:25:50 UTC