(f)  
Push the PTT switch on the captain's or first officer's control wheel.

 (g)  
Make sure the BIT (DISCRETE) 1 shows a 0.

 (h)  
Release the PTT switch.

 (i)  
On the audio selector panel, put the switch to the R VHF position.

 (j)  
Push the PTT switch on the control wheel.

 (k)  
Make sure the BIT (DISCRETE) 2 shows a 0.

 (l)  
Release the PTT switch.

 (m)  
On the tester, set the SUBFRAME to 0 and the WORD to 5.

 (n)  
Make sure the BIT (DISCRETE) 1 shows a 1

 (o)  
On the audio selector panel, put the switch to the C VHF position.

 
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757 MAINTENANCE MANUAL
 (p)  
Push PTT switch on the captain's or first officer's control wheel.

 (q)  
Make sure the BIT (DISCRETE) 1 shows a 0.

 S 865-878-001
 (2)  Release the PTT switch.
 U. HF Test
 S 735-640-001
 (1)  Do the HF test that follows:
 (a)  
Make sure the HF communication systems are operational (Ref 23-11-00).

 (b)  
Tune the left and right HF transceiver to an approved test frequency.

 (c)  
On the tester, set the SUBFRAME to 0 and the WORD to 6.

 (d)  
Make sure the BIT (DISCRETE) 1 and 2 shows a 1.

 (e)  
On the audio selector panel, put the switch to the L HF position.

 (f)  
Push the PTT switch on the captain's or the first officer's control wheel.

 (g)  
Make sure the BIT (DISCRETE) 1 shows a 0.

 (h)  
Release the PTT switch.

 (i)  
On the audio selector panel, set the switch to the R HF position.

 (j)  
Push the PTT switch on the control wheel.

 (k)  
Make sure the BIT (DISCRETE) 2 shows a 0.

 S 865-879-001
 (2)  Release the PTT switch.
 V. AIR/GROUND Discrete Signal Test
 S 735-650-001
 (1)  Do the air/ground test that follows:
 (a)  On the tester, set the SUBFRAME to 0.
 
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757 MAINTENANCE MANUAL
 WARNING: DO THE DEACTIVATION PROCEDURE FOR FLIGHT MODE SIMULATION
_______ BEFORE YOU OPEN THE AIR /GROUND CIRCUIT BREAKER. WHEN YOU OPEN THE AIR/GROUND CIRCUIT BREAKER THE AIRPLANE IS IN FLIGHT MODE. IN FLIGHT MODE, MANY OF THE AIRPLANE SYSTEMS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
　
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本文鏈接地址：757 AMM 飛機維護手冊 儀表 CHAPTER 31 - INSTRUMENTS 1(73)