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 is satisfactory. 3) If the quality of the received voice is not satisfactory, adjust the RF SENS knob on the HF control panel.
 4)  If the quality of the received voice is not satisfactory, adjust the HF volume control on the audio selector panel. a) Make sure you hear the sidetone when you transmit.
 (d)  Set the mode select switch on the HF communication control panel to the OFF position.
 F.  Put the Airplane Back to Its Initial Condition
 S 864-010
 (1)  Remove the electrical power if it is no longer necessary
 (AMM 24-22-00/201).

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 ALL  ú ú 04 Page 403 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 HF COMMUNICATION CONTROL PANEL - REMOVAL/INSTALLATION
_____________________________________________________
 1.  General
_______
 A.  Two tasks are in this procedure. The first task is the removal of the HF communication control panel. The second task is the installation of the HF communication control panel.
 B.  The HF communication control panel is installed on the aft electronics panel, P8.
 TASK 23-11-31-004-001
 2.  HF Communication Control Panel Removal
______________________________________
 A.  Access
 (1)  Location Zone
 101/102 Control Cabin, left/right

 B.  Procedure
 S 864-030
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
P18 Circuit Breaker Panel
 1) HF-1 AC
 2) HF-1 DC

 (b)  
P6 Circuit Breaker Panel
 1) HF-2 AC (if installed)
 2) HF-2 DC

 

 S 424-034
 CAUTION: CLEARLY IDENTIFY THE CONNECTOR FOR THE PANEL POSITION
_______ (LEFT, RIGHT OR CENTER) DURING REPLACEMENT. THERE IS A CROSS-CONNECTION POSSIBILITY DURING INSTALLATION.
 (2) Do these steps to remove the HF communication control panel:
 (a)  
Loosen the four quarter-turn fasteners.

 (b)  
Lift the HF communication control panel to get access to the electrical conntector.

 (c)  
Disconnect the electrical connector.

 (d)  
Put protective covers on the electrical connector.

 TASK 23-11-31-404-005
 3.  HF Communication Control Panel Installation
___________________________________________
 A.  General
 (1)  When you do the HF communication system test, make sure the airplane is not in or near any large metal structures. HF communications while the airplane is on the ground can be degraded by airplane orientation of by rf signal attenuation. If the transmitted and received voice is not satisfactory, move the airplane to a better position.
 B.  References
 (1)  AMM 24-22-00/201 Electrical Power - Manual Control
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 23-11-31
 ALL  ú ú 07 Page 401 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 C. Access
 (1)  Location Zone
 101/102 Control Cabin, left/right

 D. Procedure
 S 434-031
 CAUTION: CLEARLY IDENTIFY THE CONNECTOR FOR THE PANEL POSITION
_______ (LEFT, RIGHT OR CENTER) DURING REPLACEMENT. THERE IS A CROSS-CONNECTION POSSIBILITY DURING INSTALLATION.
 (1)  Do these steps install the HF communication control panel:
 (a)  
Remove the protective covers from the electrical connector.

 (b)  
Examine the electrical connector for bent or broken pins, dirt, and damage.

 (c)  
Connect the electrical connector.

 (d)  
Put the HF communication control panel into its position on the panel (P8 or P9).

 (e)  
Tighten the four quarter-turn fasteners.

 S 864-021
 (2)  Remove the DO-NOT-CLOSE tag and close the circuit breaker for the HF panel that you installed:
　
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