(2)  
AMM 24-22-00/201, Electrical Power - Manual Control

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A
757
MAINTENANCE MANUAL

 D. Access
 (1)  
Location Zones
 119 Main Equipment Center (LH)
 120 Main Equipment Center (RH)
 211 Control Cabin (LH)
 212 Control Cabin (RH)
 153 Aft Cargo Compartment (LH)
 154 Aft Cargo Compartment (RH)

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

 E. Prepare for Test
 S 865-085
 WARNING: DO NOT OPERATE THE HF COMMUNICATIONS SYSTEM WHILE PERSONS
_______ REFUEL OR DEFUEL THE AIRPLANE. AN EXPLOSION CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE AIRPLANE.
 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 865-016

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

 S 865-018

 (3)  
Make sure the applicable circuit breakers on the overhead circuit breaker panel, P11, are closed:

 (a)  
11G8, HF COMM LEFT

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

 F. HF System Test
 S 735-050
 (1)  Do the HF System test as follows:
 (a)  
Connect the headset/boom microphone to the captain's jack panel (P13).

 (b)  
Push the L HF MIC SELECTOR switch on the captain's ASP (P8).

 (c)  
Adjust the L HF listen switch.

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

 (e)  
Set the mode selector switch to the AM position on the left HF communication control panel (P5). 1) Make sure the left HF communication transceiver internal

 blower fan operates during the test.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 757 MAINTENANCE MANUAL
 (f) (g)  Push and hold the SQL/LAMP TEST switch on the left transceiver front panel. 1) Make sure all three status lights on the transceiver front panel come on and stay on. 2) Make sure the squelch is removed and you can hear background noise.Release the SQL/LAMP TEST switch and make sure all status lights go off.
 NOTE:____ If a status light stays on after the SQL/LAMP TEST switch is released, a fault condition is set.
 (h) (i)  Turn the RF SENS control fully clockwise on the HF comm control panel (P5).GUN 001-050,052-999; Set the frequency selectors to an AM frequency between 2.8 MHz and 23.999 MHz.
 (j)  GUN 051; Set the frequency selectors to an AM frequency between 2.0 MHz and 29.999 MHz.
 (k)  Push and release the captain's PTT switch. 1) Listen for a 1 kHz tune-in-progress tone 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 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.
 (l)  2) Make sure none of the status lights on the left transceiver front panel come on.Push and hold the PTT switch. 1) Make sure none of the status lights on the left transceiver front panel come on.
 NOTE:____ A 1 kHz tone will be heard while the PTT switch is pushed if an out of band frequency is set.
　
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