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 C.  To prevent trouble-shooting that is not necessary, make sure the specified problem continues to occur. If the flight report says that the HF system does not operate on one or two specific frequencies, operate the HF system at those frequencies. Airplane location or other conditions in the area at the time possibly caused the problem to occur. Make sure the problem occurs at your location. Also make sure the flight interphone system operates correctly. A problem with the HF system can be the result of a defective component in an audio selector panel.
 D.  Before you operate the HF system, make sure all HF circuit breakers on load control center(s) P18, (and P6, if HF-2 is installed), are closed (pushed in). Make sure the power is supplied. Wait approximately 15 seconds for the HF system to be at the correct operation temperature before you do trouble-shooting.
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 ALL  ú ú 02 Page 101 ú Nov 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL 
2.  _____________________Troubleshooting Chart 

PROBLEM POSSIBLE CAUSE  PROCEDURE TROUBLESHOOTING  PROCEDURE CORRECTION 
The HF system does not receive or transmit. Intermittent or unsatisfactory received and transmitted voice  supplied to the HF transceiver, or the HF trans-ceiver is defective. The power is not does not tune to the set frequency. The HF control panel is defective. The HF transceiver  possibly bent. HF control panel arePush and hold the SQL/LAMP TEST switch on the HF transceiver. Make sure the LRU FAIL, CONTROL INPUT FAIL, and KEY INTERLOCK lights come on. If the lights do not come on, make sure the applicable closed on P6 or P18. Make sure power is supplied to P6 or P18. If the problem continues, replace the lights. If the problem continues, the HF transceiver is defective. Set the HF control panel two or three times to the unsatisfactory frequency from above the unsatisfac-tory frequency. Set the HF control panel two or three times to the unsatis-factory frequency from below the unsatisfactory frequency. If the CONTROL INPUT FAIL light on the HF transceiver comes on, the HF control panel is defective. If the HF system receives unsatis-factorily when set from only one direction, the switch contacts in the HF circuit breakers are  Replace the HF transceiver. control panel. Replace the HF 

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 ALL  ú ú 01 Page 102 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
PROBLEM  POSSIBLE CAUSE  TROUBLESHOOTING PROCEDURE  CORRECTION PROCEDURE
(Continued) transmitted voice received and unsatisfactory Intermittent or transmitted voice Intermittent or Intermittent or unsatisfactory unsatisfactory received voice  possibly defec-coupler is set frequency. not tune to the The HF system does tive. transceiver Defective HF Defective HF HF control panel transceiver or The HF antenna  coupler tunes to the set tune the HF system cor-HF antenna coupler did not INTERLOCK light is on, the is off. If the KEY light on the HF transceiver Make sure the KEY INTERLOCK different test frequencies. and tune the HF system to tune the HF system. Set a push-to-talk switch to to a test frequency. Push Set the HF control panel rectly. Push momentarily a push-to-talk (PTT) switch. Wait while the HF antenna frequency. Then push and hold the PTT switch. Make sure the LRU FAIL light on the HF transceiver does not come on. Make sure the LRU FAIL light does not flash. Speak into the microphone and listen to the sidetone. If the LRU FAIL light comes on or flashes, the HF transceiver is defective. If the sidetone is unsatisfactory, the HF transceiver is defective. Connect a headphone to the PHONE jack on the HF transceiver. Listen to the received voice. If the received voice is satis-factory, the HF control panel is defective. If the received voice is unsatis-factory, the HF transceiver is defective.  antenna coupler. Replace the HF transceiver. Replace the HF Replace the HF transceiver or the HF control panel. 

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