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A
747-400 MAINTENANCE MANUAL
 DC BUS ISOLATION RELAY - REMOVAL/INSTALLATION
_____________________________________________
 1.  General_______
 A.  This procedure has two tasks. One task is the removal of a DC bus isolation relay (DCIR) (R7219, R7220, R7221, or R7222). The other task is the installation of the relay.
 B.  The installation task includes an operational check of the relay.
 C.  The four DCIRs are installed in the P180 DC power distribution panel. The P180 panel is between the nose gear wheel well and the fuselage, on the right side. Access to the P180 panel is through an access opening, forward of the E/E compartment.
 TASK 24-32-03-004-001
 2.  DC Bus Isolation Relay Removal (Fig. 401)______________________________
 A.  References
 (1)  
24-22-00/201, Manual Control

 (2)  
IPC 24-32-02 Fig. 1

 (3)  
WDM 24-32-12, 24-32-21

 (4)  
SSM 24-32-02

 B.  
Access

 (1)  
Location Zone 116 Area Between Nose Gear Well and Fuselage, RH

 (2)  
Access Panel
 P180 DC Power Distribution Panel

 C.  
Procedure

 (1)
Make sure all electrical power is off (Ref 24-22-00/201).

 S 864-031

 (2)
Disconnect the electrical connectors from the batteries:

 (a)  
Turn the knob on the main battery connector (DM7423A) counterclockwise until the connector is free from the main battery receptacle.

 S 864-003
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 24-32-03
 ALL  ú ú 01 Page 401 ú Oct 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400 MAINTENANCE MANUAL
SEE A
SCREW (2 LOCATIONS)
DC BUS ISOLATION
DC BUS ISOLATION RELAY (R7222)RELAY (R7221)
DC BUS ISOLATION  SEE  B  SEE  B 
RELAY (R7219)  DC BUS ISOLATION 
SEE  B  RELAY (R7220) 
SEE  B 

P180 DC POWER DISTRIBUTION PANEL
DC BUS ISOLATION  A
RELAY (EXAMPLE)
TERMINAL NUT AND WASHER
COVER
SCREW (2 LOCATIONS) NOTE: THE TERMINAL LEADS ARE DELETED FOR CLARITY.
B
DC Bus Isolation Relays Installation Figure 401
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 24-32-03
 ALL  ú ú 01 Page 402 ú Oct 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)  Turn the knob on the APU battery connector (DM7432A) counterclockwise until the connector is free from the APU battery receptacle.
 S 014-004
 (3)  
Open the access doors for the P180 panel.

 S 034-025

 (4)  
Disconnect the electrical leads from the relay.

 (a)  
Remove the screws that attach the terminal cover to the relay.

 (b)  
Remove the terminal cover.

 (c)  
Remove the nuts and the washers that attach the leads to the terminal studs on the relay.

 (d)  
Attach an identification tag to each electrical lead.

 (e)  
Remove the electrical leads from the terminal studs.

 S 024-026
 (5)  
Remove the relay.

 (a)  
Remove the screws that attach the relay to the panel.

 (b)  
Remove the relay from the panel.

 (c)  
Install the nuts, the washers, and the terminal cover on the relay.

 TASK 24-32-03-404-011
 3.  DC Bus Isolation Relay Installation (Fig. 401)___________________________________
 A. References
 (1)  
24-22-00/201, Manual Control

 (2)  
AMM 45-10-00/201, Central Maintenance Computer System

 (3)  
IPC 24-32-02 Fig. 1

 (4)  
WDM 24-32-12, 24-32-21

 (5)  
SSM 24-32-02

 B.
Access

 (1)  
Location Zone 116 Area Between Nose Gear Well and Fuselage, RH

　
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