(c)  
Set the mode select switch to the applicable mode (AM or USB/LSB) on the HF-2 communication control panel.

 (d)  
On the first officer's audio selector panel (ASP), push and release the HF-2 switch. 1) Make sure the HF-2 switch light comes on.

 (e)  
On the first officer's ASP, set the HF-2 sound control to the middle position.

 (f)  
Set the frequency display on the HF-2 control panel to an approved test frequency.

 (g)  
Turn the RF SENS control clockwise to the maximum position on the HF-2 control panel.

 CAUTION: SET THE HF COMMUNICATION SYSTEM TO OFF, IF THE HF
_______ TRANSCEIVER BLOWER FAN DOES NOT OPERATE. HEAT CAN CAUSE DAMAGE TO THE EQUIPMENT.
 (h)  
Make sure the HF-2 transceiver blower operates when you transmit.

 (i)  
Speak with the tower radio operator. 1) Push and release a push-to-talk (PTT) switch.

 a)  Make sure you hear a 1-kilohertz sound from the headset.
 NOTE: You hear a 1-kilohertz sound, while the
____ antenna coupler tunes to the test frequency. If you hear a 1-kilohertz sound for more than 10 seconds, the test frequency is possibly out of range for HF communication.
 2) Push and hold the PTT switch while you transmit. a) Make sure the quality of the transmitted and received voice is satisfactory. b) Make sure you hear the sidetone when you transmit.
 3)  Turn the HF-2 sound control slowly counterclockwise on the first officer's ASP. a) Make sure the sound of the received voice decreases
 slowly, while you turn the control.
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 4)  Turn the HF-2 sound control slowly clockwise on the first officer's ASP. a) Make sure the sound of the received voice increases
 slowly, while you turn the control.
 5)  Turn the RF SENS control slowly counterclockwise on the HF-2 control panel. a) Make sure the sound of the received voice decreases
 slowly, while you turn the control.
 6)  Turn the RF SENS control slowly clockwise on the HF-2 control panel. a) Make sure the sound of the received voice increases
 slowly, while you turn the control.
 (j)  
If it is applicable at your location, do a test of the other mode(s) of operation (AM or USB/LSB/SSB). 1) Set the mode select switch to AM or USB/LSB/SSB on the HF-2

 control panel. 2) Set the frequency display to a different approved test frequency. 3) Speak with the tower radio operator. a) Make sure the quality of the transmitted and received voice is satisfactory.

 (k)  
Set the mode select switch to the OFF position on the HF-2 communication control panel.

 (l)  
Remove the headphone from the jack panel.

 (m)  
Remove the hand microphone from the jack panel.

 F.  Put the Airplane Back to Its Initial Condition
 S 865-018
 (1)  Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

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 HF COMMUNICATION TRANSCEIVER - REMOVAL/INSTALLATION
___________________________________________________
 1.  General_______
 A.  Two tasks are in this procedure. The first task is the removal of the HF transceiver. The second task is the installation of the HF transceiver.
 B.  Each HF transceiver is installed in the main equipment center on
 electronic equipment rack E1, E2, E3, or E5 or in the aft cargo
 compartment on electronic equipment rack E6.

 TASK 23-11-21-004-001
 2.  HF Transceiver Removal______________________
 A.  References
 (1)  AMM 20-10-07/201, E/E Rack-Mounted Components
　
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