(b)  
P6 Load Control Center - Right
 1) OVERHEAD 28V PRIMARY

 S 424-006
 (2)  Install the instrument switching module:
 (a)  
Make sure the electrical connectors on the module are not loose, bent, or broken.

 (b)  
Connect the electrical connectors to the module.

 (c)  
Put the module into the panel.

 (d)  
Install the screws into the front of the module.

 (e)  
Install the edge light panel.

 S 864-007
 (3) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  
P18 Load Control Center - Left
 1) INSTR XFR

 (b)  
P6 Load Control Center - Right
 1) OVERHEAD 28V PRIMARY

 S 714-008
 (4)  
Do the VHF NAV Transfer Switch Test part of the VOR/ILS Operational Test (Ref 34-31-02/501).

 S 864-011

 (5)  
If electrical power is not necessary, do this task to remove electrical power: Manual Control (AMM 24-22-00/201).

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 34-31-82

 ú ú 04 Page 402 ú Nov 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 RF ATTENUATOR - REMOVAL/INSTALLATION
____________________________________
 1.  General_______
 A.  This subject has two tasks. The first task is the removal of the RF attenuator. The second task is the installation of the RF attenuator and a test of the attenuator.
 TASK 34-31-91-004-003
 2.  RF Attenuator Removal_____________________
 A.  General
 (1)  The RF attenuators are installed on the ILS transfer relays. The ILS transfer relays are installed on shelf No. 4 of the electronics equipment rack, E3 (Fig. 401).
 B.  Access
 (1)  
Location Zone
 205 Electronic Compartment

 (2)  
Access Panels
 1201L Electronic Equipment Access Door

 C.  Procedure
 S 024-002
 (1)  Remove the RF attenuator:
 (a)  
Disconnect the coaxial cable from the RF attenuator.

 (b)  
Disconnect the RF attenuator from the ILS transfer relay.

 TASK 34-31-91-404-005
 3.  RF Attenuator Installation__________________________
 A.  General
 (1)  The RF attenuators are installed on the ILS transfer relays. The ILS transfer relays are installed on shelf No. 4 of the electronics equipment rack, E3 (Fig. 401).
 B.  References
 (1)  
24-22-00/201, Manual Control

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

 (3)  
34-31-02/501, VOR/ILS Navigation System

 C.  Access
 (1)  
Location Zone
 205 Electronic Compartment

 (2)  
Access Panels
 1201L Electronic Equipment Access Door

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

 34-31-91
 ú ú 13 Page 401 ú Jul 15/92

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 D. Procedure
 S 424-004
 (1)  Install the RF attenuator:
 (a)  
Connect the RF attenuator to the ILS transfer relay.

 (b)  
Connect the coaxial cable to the RF attenuator.

 S 714-007
 (2)  
Do the LOC Test part of the VOR/ILS System Test
 (Ref 34-31-00/501, 34-31-02/501).

 S 864-012

 (3)  
If electrical power is not necessary: Do this task to remove electrical power: Manual Control (Ref 24-22-00/201).

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