S 414-043

 (2)  
Install the HF comm antenna coupler (AMM 20-10-01/401).

 S 414-011

 (3)  
Install the access panel, 322 CL, on the left side of the vertical stabilizer (AMM 6-42-00/201).

 S 864-008

 (4)  
Remove the DO-NOT-CLOSE tags and close the applicable circuit breakers on the overhead circuit breaker panel, P11:

 (a)  
11G8, HF COMM LEFT

 (b)  
11G34, HF COMM RIGHT (if installed)

 D. Installation Test - HF Communication Antenna Coupler
 S 864-012
 WARNING: DO NOT OPERATE THE HF SYSTEM WHILE FUEL IS PUT INTO THE
_______ AIRPLANE. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 WARNING: MAKE SURE PERSONNEL STAY A MINIMUM OF 6 FEET AWAY FROM THE
_______ VERTICAL STABILIZER WHEN THE HF SYSTEM TRANSMITS. RF ENERGY FROM THE HF COMMUNICATION ANTENNA CAN CAUSE INJURIES TO PERSONNEL.
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-014

 (2)  
Make sure the captain's audio selector panel operates
 (AMM 23-51-00/501).

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757
MAINTENANCE MANUAL

 S 864-015
 (3)  Set the mode selector switch to the AM or USB position on the HF communication control panel, (P5).
 (a)  
Set the frequency display to an approved test frequency.

 (b)  
Set the RF SENS control to an applicable level.

 S 864-017
 (4)  
Connect the headset-boom microphone to the captain's jack panel (P13).

 S 864-018

 (5)  
Push the L HF (or R HF), microphone selector switch, as applicable, on the captain's audio selector panel (P8).

 (a)  
Adjust the L HF, (or R HF), listen switch as applicable.

 (b)  
Set the BOOM/OXY (or BOOM/MASK) switch to the BOOM position.

 S 864-022
 (6)  Push and release the captain's PTT switch.
 (a) Listen for 1 KHz tune-in-progress sound in the headset.
 NOTE: A continuous or pulsed tone indicates that the coupler
____ is tuning to a new frequency. The coupler tune tone will sound no longer than 15 seconds. The average coupler tune time is approximately 1 to 7 seconds.
 NOTE: Some coupler types are able to tune quickly when
____ previously used frequencies are selected, in which case the tune tone may be only a momentary beep.
 S 864-023
 (7)  Push and hold the PTT switch.
 (a)  
Speak into the microphone.

 (b)  
Listen for the sidetone in the headset.

 S 864-035
 (8)  Release the PTT switch.
 E. Put the airplane back to its usual condition.
 S 864-048
 (1)  
Set the mode selector switch to the OFF position on the HF
 communication control panel (P5).

 (2)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 864-025
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757 MAINTENANCE MANUAL
 HF COMMUNICATIONS CONTROL PANEL - REMOVAL AND INSTALLATION
__________________________________________________________
 1.  General
_______
 A.  The control panel for the left HF communication system, M82, is installed on the left side of pilots' overhead panel, P5. The control panel for the right HF communication system, M83, (if installed), is on the right side of pilots' overhead panel, P5.
 TASK 23-11-02-004-034
 2.  Remove the HF Communication Control Panel
_________________________________________
　
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