(NOTE 5) (NOTE 3) (NOTE 4) (NOTE 1) RESERVED

NOTE 2: LABEL 043 (01110000) REPRESENTS THE TRANSPONDER CODE. 11
NOTE 1: ALT. REP. ON

ALT. REP. OFF NOTE 3: ALWAYS 00 (NORM) FOR THIS PANEL.
12
IDENT. OFF IDENT. ON NOTE 4: PANEL DISPLAY WOULD SHOW '3620'

NOTE 5: BIT WILL SET TO A LOGIC 1 TO MAKE PARITY ODD
A
737-300/400/500MAINTENANCE MANUAL
 ATC SYSTEM - TROUBLE SHOOTING
_____________________________
 1.  General_______
 A.  The trouble shoting procedures make use of the self-test features of the ATC transponder and ATC system test to isolate problems. These procedures is in a tree-type format.
 B.  If the procedure does not correct the problem examine and repair if necessary, the circuit between the equipment.
 C.  The trouble shooting procedures are applicable ATC system No. 1 and ATC system No. 2.
 2.  References__________
 A.  24-22-00/201, Manual Control
 B.  34-53-02/501, ATC System - Adjustment/Test
 C.  34-53-11/201, ATC Antenna - Removal/Installation
 D.  34-53-21/201, ATC Transponder - Removal/Installation
 E.  34-53-31/201, ATC Control Panel - Removal/Installation
 3.  Prepare for Trouble Shooting____________________________
 A.  Supply the electrical power (Ref 24-22-00).
 B.  Make sure the ATC, interphone and air data system circuit breakers on P18 and P6 panels are closed.
 C.  On the ATC control panel, set the ATC select switch to the transponder to be tested (L - No. 1 or R - No. 2).
 NOTE: Let the transponder warmup for at least one minute.
____
 D.  Do the operational or system test (Ref. 34-53-02/501).
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A 737-300/400/500MAINTENANCE MANUAL

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A 737-300/400/500MAINTENANCE MANUAL

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A
737-300/400/500MAINTENANCE MANUAL
 ATC SYSTEM - ADJUSTMENT/TEST
____________________________
 1.  General_______
 A.  The ATC system adjustment/test procedure contain two tasks. One is an operational test; the other is a system test. The operational test is a fast check of the ATC system and no test equipment is needed. The system test first does the operational test. Then it uses test equipment to examine the ATC code reception, altitude reporting, transponder sensitivity, side lobe suppression and transmitter frequency.
 B.  The system test uses the Instrument Flight Research 601 ATC ramp test sets or the TIC T-48 or T-49 ramp test set.
 C.  Because the ATC transponder responds to signals from the antenna with the strongest signal strength, it is necessary to put the test set antenna close to the airplanes antenna to do a proper test. The test set antenna should be put near the bottom ATC antenna on the airplane to examine the bottom transponder circuitry and the same for the top ATC antenna.
 TASK 34-53-02-715-003
 2.  Operational Test - ATC System_____________________________
 A.  General
 (1)  
The operational test is a fast check of the ATC system. It uses only the system's BITE function. No special test or ground equipment is necessary.

 (2)  
The ATC transponder internal BITE circuitry do a self-test on all internal circuitry. This includes the injection of Mode S signals into the receiver unit to examine if the signals are processed properly. If the Mode S function fails, the red TPR FAIL LED indicator comes on.
　
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