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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 424-044
 (4)  Do this task to install the applicable navigation unit: Install the Rack-Mounted E/E Box (Ref 20-10-07/201).
 S 864-068
 (5)  For the No. 1 navigation unit, remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P18 Load Control Center - Left 1) VOR/LOC-1 2) GS-1 3) INSTR XFMR-1
 S 864-069
 (6)  For the No. 2 navigation unit, remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P6 Load Control Center - Right 1) VOR/LOC-2 2) GS-2 3) INSTR XFMR-2
 S 864-049
 (7)  Do this task to supply electrical power: (Ref 24-22-00/201). Manual Control
 S 714-072
 (8)  Do a check of the navigation unit: (a) Set the mode-selector on the DFCS mode control panel to the HDG position. (b) For the No. 1 or the No. 2 navigation unit, set the VHF NAV transfer switch on the instrument switching module to the NORMAL position. (c) Tune the VOR/ILS navigation system to a local VOR station. 1) Listen for the local VOR station sound on the flight interphone (Ref 23-51-00/501).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 864-060
 (9)  If electrical power is not necessary, do this task to remove electrical power: Manual Control (AMM 24-22-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 NAVIGATION UNIT - REMOVAL/INSTALLATION
______________________________________
 1.  General_______
 A.  This subject has two tasks. The first task is the removal of the navigation unit. The second task is the installation of the navigation unit and a test of the navigation unit.
 TASK 34-31-42-004-068
 2.  Navigation Unit Removal_______________________
 A.  General
 (1)  The navigation units are installed in the electronics equipment rack. The No. 1 navigation unit (M154) and the No. 2 navigation unit (M155) are on shelf 4 of the E3 rack.
 B.  References
 (1)  20-10-07/201, E/E Rack-Mounted Components
 C.  Access
 (1)  
Location Zone
 205 Electronic Compartment

 (2)  
Access Panels
 1201L Electronic Equipment Access Door

 D.  Procedure
 S 864-032
 (1)  For the No. 1 navigation unit, open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P18 Load Control Center - Left
 1) VHF NAV-1 VOR/ILS
 2) INSTR XFMR-1

 S 864-062
 (2)  For the No. 2 navigation unit, open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6 Load Control Center - Right
 1) VHF NAV-2 VOR/ILS
 2) INSTR XFMR-2

 S 024-036
 CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE
_______ NAVIGATION UNIT. IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE FROM YOUR BODY CAN CAUSE DAMAGE TO THE NAVIGATION UNIT.
 (3)  Do this task to remove the applicable navigation unit: Remove the Rack-Mounted E/E Box (Ref 20-10-07/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 034-038
 (4)  Install dust caps on the electrical connectors.
　
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