S 864-083

 (7)  
If electrical power is not necessary, do this task to remove electrical power: Manual Control (AMM 24-22-00/201).

 TASK 34-31-71-004-084
 4.  VHF NAV Transfer Relay Removal______________________________
 A. General
 (1)  The VHF NAV transfer relays are installed on shelf 4 of the electronic equipment rack (E3).
 B. References
 (1)  AMM 34-31-41/401, Navigation Unit
 C. Access
 (1)  
Location Zone
 205 Electronic Compartment

 (2)  
Access Panel
 1201L Electronic Equipment Access Door

 D. Procedure
 S 864-085
 (1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P18 Load Control Center - Left
 1) G/S-1
 2) INSTR XFMR-1
 3) INSTR XFR

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 4) VOR/LOC-1

 (b)  P6 Load Control Center - Right
 1) G/S-2
 2) INSTR XFMR-2
 3) VOR/LOC-2

 S 014-088
 (2)  
Do this task to remove the navigation units to get access to the transfer relay: Navigation Unit Removal (Ref 34-31-41/401).

 S 024-089

 (3)  
Remove the VHF NAV transfer relay:

 (a)  
Disconnect the coaxial cables and electrical cables from the relay.

 (b)  
Remove the screws that attach the relay to the shelf.

 (c)  
Remove the VHF NAV transfer relay from the shelf.

 TASK 34-31-71-404-090
 5.  VHF NAV Transfer Relay Installation___________________________________
 A. General
 (1)  The VHF NAV transfer relays are installed on shelf 4 of the electronic equipment rack (E3).
 B. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 34-31-00/501, VOR/ILS Navigation System

 (3)  
AMM 34-31-41/401, Navigation Unit

 C. Access
 (1)  
Location Zone
 205 Electronic Compartment

 (2)  
Access Panel
 1201L Electronic Equipment Access Door

 D. Procedure
 S 864-091
 (1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P18 Load Control Center - Left
 1) G/S-1

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (b)  2) INSTR XFMR-1 3) INSTR XFR 4) VOR/LOC-1P6 Load Control Center - Right 1) G/S-2 2) INSTR XFMR-2 3) VOR/LOC-2
 S 424-094
 (2)  Install the VHF NAV transfer relay: (a) Align the relay to the holes in the shelf. (b) Install the screws to attach the relay to the shelf. (c) Connect the coaxial cables and electrical cables to the relay and tighten with your hand.
 S 414-095
 (3)  Do this task to install the navigation unit: Navigation Unit Installation (Ref 34-31-41/401).
 S 864-096
 (4)  Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P18 Load Control Center - Left 1) G/S-1 2) INSTR XFMR-1 3) INSTR XFR 4) VOR/LOC-1 (b) P6 Load Control Center - Right 1) G/S-2 2) INSTR XFMR-2 3) VOR/LOC-2
 S 714-099
 (5)  Do the VHF NAV Transfer Switch Test part of the VOR/ILS Operational Test (Ref 34-31-00/501).
 S 864-105
 (6)  If electrical power is not necessary, do this task to remove electrical power: Manual Control (AMM 24-22-00/201)

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