757 AMM 飞机维护手册 COMMUNICATIONS 通讯(17)

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 23-51-00/501).
 S 864-011
 (5)  Connect the headset-boom microphone to the captain's jack panel
 (P13).
 S 864-012
 (6)  Push the L HF or R HF MIC 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.
 (c) Set the mode selector switch to the AM or USB position on the
 HF communication control panel (P5).
 (d) Set the frequency select switches to an approved test
 frequency.
 (e) Set the RF SENS control to an applicable level.
 S 864-016
 (7)  Push and release the captain's PTT switch.
 (a) Listen for a 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.

 S 864-017
 (8) Push and hold the PTT switch.
 (a)
Speak into the microphone.

 (b)
Listen for the sidetone in the headset.

 S 864-020
 (9)
Release the PTT switch.

 S 864-018

 (10)
 Set the mode selector switch to the OFF position on the HF communication control panel (P5).

 S 864-032

 (11)
 Remove the DO-NOT-CLOSE tag and close the last circuit breaker (if installed), on the P11 panel, for the HF communication control panels:

 (a) 11G8, HF COMM LEFT
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MAINTENANCE MANUAL

 (b)  11G34, HF COMM RIGHT (if installed)
 S 714-033
 (12) If a second HF system is installed, do these steps:
 (a)  
Use the applicable HF communication control panel to set the HF communication system to a test frequency.

 (b)  
Repeat the communication test for the applicable HF communication control panel, and make sure the HF communication system operates satisfactorily.

 S 864-019
 (13) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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 HF COMMUNICATION TRANSCEIVER - REMOVAL AND INSTALLATION
_______________________________________________________
 1.  General
_______
 A.  The left HF communication transceiver, M152 and the right HF communication transceiver, M153, (if installed), is located in the main equipment center on the E3 or E4 rack or in the aft equipment center on the E6 rack.
 TASK 23-11-03-024-001
 2.  Remove the HF Communication Transceiver
_______________________________________
 A.  References
 (1)  AMM 20-10-01/401, E/E Rack Mounted Components - Standard Practices
 B.  Access
 (1)  
Location Zones
 153 Aft Cargo Compartment (Left)
 154 Aft Cargo Compartment (Right)
 119 Main Equipment Center (Left)
 120 Main Equipment Center (Right)
 211 Control Cabin (Left)
 212 Control Cabin (Right)

 (2)  
Access Panel
 822 Aft Cargo Compartment Door
 119BL Main Equipment Center Access

 

 C.  Procedure
 S 864-002
 (1)  Open the applicable circuit breakers on the overhead circuit breaker panel, P11, and attach DO-NOT-CLOSE tags:
 (a)  
11G8, HF COMM LEFT

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

 S 024-008
 (2) Remove the HF communication transceiver (AMM 20-10-01/401).
 TASK 23-11-03-424-009
 3.  HF Communication Transceiver Installation
　
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