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 B.  If the procedure does not correct the problem, examine and repair, if necessary, the circuit between equipments.
 C.  The trouble shooting procedures are applicable for ATC system No. 1 and ATC system No. 2.
 2.  Prepare for Trouble Shooting____________________________
 A.  Supply the electrical power.
 B.  Make sure the ATC, interphone and air data system circuit breakers on P18 and P6 panels are closed.
 C.  Select the transponder to be tested.
 NOTE: Let the transponder warmup for at least one minute.
____
 D.  Do the operational or system test (34-53-00/501).
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A
737-300/400/500MAINTENANCE MANUAL
 ATC SYSTEM - ADJUSTMENT/TEST
____________________________
 1.  General_______
 A.  This procedure contains two tasks. One is an operational test; the other is a system test. The operational test is a fast check of the ATC system. The system test first does the operational test. Then it uses test equipment to examine th e ATC code reception altitude reporting, transponder sensitivity, side to be suppression, and transmitter frequency.
 B.  These ramp test set can be used to do the system test:
 Collins 476X-3 test set

 Tel-Instrument Electronics Corp. T-33B test set
 Instrument Flight Research ATC-600A test set.
 Instrument Flight Research ATC 601 ramp test set.
 TASK 34-53-00-715-001
 2.  Operational Test - ATC System_____________________________
 A.  General
 (1)  This test examines the ATC system for proper operation. It uses only the system's BITE function. No special test or ground equipment is necessary.
 B.  References
 (1)  24-22-00/201, Maintenance Practices
 C.  Access
 (1)  
Location Zones
 101/102 Flight Compartment
 205 Electronic Compartment

 (2)  
Access Panels
 1201 Electronics Equipment Access Door

 

 D.  Procedure
 S 865-002
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 865-003

 (2)  
Make sure these circuit breakers are closed:

 (a)  P18 Load Control Center - Left
 1) ATC 1

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 2) DADC LEFT
 3) ALTM CAPTAIN

 (b)  P6 Load Control Center - Right
 1) ATC 2
 2) DADC RIGHT
 3) ALTM FIRST OFFICER

 S 865-004
 (3)  
Set the transponder select switch on the ATC control panel to STBY.

 S 865-005

 (4)  
Let the ATC system warmup for one minute.

 S 865-006

 (5)  
Set the transponder select switch on the ATC control panel to the L or 1 position.
　
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