LCD FAULT CODES IN THE TABLE ARE FOR EXTERNAL FAULTS, INTERNAL LRU FAULT CODES ARE NOT LISTED.
A23-12-00-018a.fm 
January 2005 
23-12
SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
A23-12-00-018a.fm 
SOUTHWEST AIRLINES. 
737-700 MAINTENANCE TRAINING MANUAL
VOR/MB/MMR/DME/RA/VHF COMM - FAULT CODE TABLES MMR ILS/GPS RECEIVER RMA-55B 
FAULT DESCRIPTION  FAULT ORIGIN  FAULT MEANING  LCD FAULT CODE  
SDI 1 PROGRAM  EXTERNAL TO LRU SYSTEM  PRGM PIN (MP-H4) IS CONNECTED TO A/C GND. IT SHOULD BE CONECTED TO SDI COMMON PIN (MP-K4).  Aa  
SDI 2 PROGRAM  EXTERNAL TO LRU SYSTEM  PRGM PIN (MP-J4) IS CONNECTED TO A/C GND. IT SHOULD BE CONECTED TO SDI COMMON PIN (MP-K4).  Eg  
NO PORT “A” TUNING DATA  EXTERNAL TO LRU SYSTEM  NO 429 TUNING DATA AVAILABLE AT FREQ/FUNCTION SELECT DATA INPUT “A.” PINS (MP-C1 AND MP-D1). *NOT USED*  Qe  
NO PORT “B” TUNING DATA  EXTERNAL TO LRU SYSTEM  NO 429 TUNING DATA AVAILABLE AT FREQ/FUNCTION SELECT DATA INPUT “B.” PINS (MP-J1 AND MP-K1)  Qf  
INVALID TUNING “A”  EXTERNAL TO LRU SYSTEM  DATA IS AVAILABLE AT PORT “A” BUT IT IS NOT VALID.  Qg  
INVALID TUNING “B”  EXTERNAL TO LRU SYSTEM  DATA IS AVAILABLE AT PORT “B” BUT IT IS NOT VALID.  Qh  
LOC ANT FAILURE  EXTERNAL TO LRU SYSTEM  LOCALIZER ANTENNA/CABLE IS OPEN, SHORTED, OR DISCONNECTED  Eh  
GS ANT FAILURES  EXTERNAL TO LRU SYSTEMS  GLIDESLOPE ANTENNA/CABLE IS OPEN, SHORTED, OR DISCONNECTED  En  
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LCD FAULT CODES IN THE TABLE ARE FOR EXTERNAL FAULTS, INTERNAL LRU FAULT CODES ARE NOT LISTED. 
January 2005 
23-12
SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved 
SOUTHWEST AIRLINES. 
737-700 MAINTENANCE TRAINING MANUAL
VOR/MB/MMR/DME/RA/VHF COMM - FAULT CODE TABLES DME INTERROGATOR DMA-37B 
FAULT DESCRIPTION  FAULT ORIGIN  FAULT MEANING  LCD FAULT CODE  
ANT MONITOR PROGRAM  EXTERNAL TO LRU SYSTEM  PRGM PIN (MP6H) IS CONNECTED TO A/C GND. IT SHOULD BE CONECTED TO ANT MONITOR COMON PIN (MP6J).  Ag  
ANT  EXTERNAL TO LRU SYSTEM  DME ANTENNA/CABLE IS OPN, SHORTED, OR DISCONNECTED  En  
INDICATOR FAILURE  EXTERNAL TO LRU SYSTEM  INDICATOR #1 (MP5E) AND/OR #2 (MP5E) ARE OPN TO GND.  Je  
NO PORT “A” TUNING DATA  EXTERNAL TO LRU SYSTEM  NO 429 TUNING DATA AVAILABLE AT FREQ/FUNCTION SELECT DATA INPUT “A.” PINS (MP3A AND MP3B).  Qe  
 
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