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FAULT DESCRIPTION  FAULT ORIGIN  FAULT MEANING  LCD FAULT CODE 
ANT MONITOR PROGRAM  EXTERNAL TO LRU SYSTEM  PRGM PIN (MP8A) IS CONNECTED TO A/C GND. IT SHOULD BE CONECTED TO ANT MONITOR COMON PIN (MP10A).  Ag 
RX MKR ANT MON  EXTERNAL TO LRU SYSTEM  MARKER ANTENNA/CABLE IS OPN, SHORTED, OR DISCONNECTED  Eg 
RX VOR ANT MON  EXTERNAL TO LRU SYSTEM  VOR ANTENNA/CABLE IS OPN, SHORTED, OR DISCONNECTED  Eh 
NO PORT “A” TUNING DATA  EXTERNAL TO LRU SYSTEM  NO 429 TUNING DATA AVAILABLE AT FREQ/FUNCTION SELECT DATA INPUT “A.” PINS (MP9B AND MP9C).  Qe 
NO PORT “B” TUNING DATA  EXTERNAL TO LRU SYSTEM  NO 429 TUNING DATA AVAILABLE AT FREQ/FUNCTION SELECT DATA INPUT “B.” PINS (MP11B AND MP11C).  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 
- 273 -

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 
- 274 -

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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