C.  Procedure
 S 864-002
 (1)
Open these circuit breakers for the applicable ADF receiver:

 (a)  P7 Overhead Circuit Breaker Panel
 1) 7B9 NAV RADIO ADF L
 2) 7B20 NAV RADIO ADF R

 (2)  
Loosen the rack door fasteners, and open the door.

 S 014-011
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747-400 MAINTENANCE MANUAL
 S 024-003
 CAUTION: DO NOT TOUCH THE ADF RECEIVER BEFORE YOU DO THE PROCEDURE FOR
_______ DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROCSTATIC DISCHRAGE CAN CAUSE DAMAGE TO THE ADF RECEIVER.
 (3)  Remove the ADF receiver (AMM 20-11-22/401).
 TASK 34-57-01-404-004
 3. Install the ADF Receiver
________________________
 A. References
 (1)  
20-11-22/401, E/E Rack Mounted Components

 (2)  
20-41-02/201, Electrostatic Discharge Sensitive Devices

 (3)  
24-22-00/201, Manual Control

 (4)  
IPC 34-57-10, Fig. 1

 B. Access
 (1)  
Location Zone
 129 Keel Beam

 (2)  
Access Panel
 125B Center Electronics Access Door

 C. Procedure
 S 864-005
 (1)  Make sure these circuit breakers are open, for the applicable ADF receiver:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7B9 NAV RADIO ADF L
 2) 7B20 NAV RADIO ADF R

 S 214-006
 CAUTION: DO NOT TOUCH THE ADF RECEIVER BEFORE YOU DO THE PROCEDURE FOR
_______ DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROCSTATIC DISCHRAGE CAN CAUSE DAMAGE TO THE ADF RECEIVER.
 (2)  
Make sure the receiver and rack connectors do not have loose, dirty, or broken pins.

 S 424-007

 (3)  
Install the ADF receiver (AMM 20-11-22/401).

 D. ADF Receiver Test
 S 864-007
 (1)  Supply electrical power (Ref 24-22-00/201).
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 (2)  S 864-008Close these circuit breakers for the applicable ADF receiver: (a) P7 Overhead Circuit Breaker Panel 1) 7B9 NAV RADIO ADF L 2) 7B20 NAV RADIO ADF R 3) 7C1 FMCS FMC L 4) 7C2 FMCS CDU L 5) 7C4 FMCS A/T SERVO L
 (3)  S 714-009Do the self-test on the ADF receiver. (a) Use the FMC to tune the ADF receiver to a local broadcast station's frequency. (b) Push and Release the TEST switch on the ADF receiver. (c) Make sure this sequence occurs on LCD of the ADF receiver: 1) The LCD screen displayes "Test in progress". 2) The LCD screen displayes "Test complete, No Failures".
 (4)  S 864-010Remove electrical power if it is not necessary (Ref 24-22-00/201).

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747-400 MAINTENANCE MANUAL
 AUTOMATIC DIRECTION FINDER (ADF) ANTENNA - REMOVAL/INSTALLATION
_______________________________________________________________
 1.  General_______
 A.  This procedure has two tasks. One is the removal of the ADF antenna; the other is the installation of the ADF antenna.
 B.  The left and right ADF antennas are installed on the centerline of airplane at stations 1300 and 1340, respectively.
 TASK 34-57-02-004-001
 2.  Remove the ADF Antenna______________________
 A.  Standard Tools and Equipment
 (1)  Sealant Removal Tool - hardwood or plastic
　
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