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% The SENS button (4) selects either high or low sensitivity as indicated by the HI or LO LED % being lit. Low sensitivity is used on ILS approaches while high sensitivity allows operation over % airway markers or to get an earlier indication of nearing the outer marker during an approach.
% The marker audio is selected initially by pressing the MKR/MUTE button (2). If no marker % beacon signal is being received, then pressing again will deselect the marker audio.
Doc # 6.02.01 Page 11
Rev. 4 09 Jan 2003

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AMM

D. Marker Beacon Receiver Antenna
The Comant CI 102 marker beacon receiver antenna is located on the lower side of the fuselage, under the baggage compartment.
Page 12 Doc # 6.02.01 09 Jan 2003 Rev. 4
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Communications
AMM

Trouble-Shooting
1. General
The table below lists the defects you could have with the audio integrating system and the marker beacon receiver system. If you have the trouble detailed in the Trouble column read across to the Possible Cause column. Then do the repair given in the Repair column.
A. Intercom Functions
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Trouble  Possible Cause  Repair 
No voice modulation when transmitting from co-pilot's side on head-set. Pilot's side OK.  Faulty head-set. Open mic audio line. Faulty intercom or audio panel.  Replace head-set. Do a test of the mic audio wiring. Refer to Chapter 92 for the wiring diagrams. Replace the intercom or audio panel. 
No voice modulation when transmitting from pilot’s side on head-set. Co-pilot’s side OK.  Faulty head-set. Open mic audio line. Faulty intercom or audio panel.  Replace head-set. Do a test of the mic audio wiring. Refer to Chapter 92 for the wiring diagrams. Replace the intercom or audio panel. 
Cannot transmit. Transmit  Faulty mic PTT switch.  Replace the defective PTT 
annunciator (if available) not  switch. 
showing on COM display.  PTT wiring circuit open. Faulty COM unit. Faulty audio panel.  Do a test of the PTT wiring. Refer to Chapter 92 for the wiring diagrams. Replace the COM unit. Replace the audio panel. 
No intercom audio on pilot’s  ISO mode (PM 100 II or KMA)  Select ALL mode. 
head-set. Receives radio  or PILOT mode (GMA 340) 
transmissions correctly.  selected. Faulty intercom or audio panel.  Replace the intercom or audio panel. 

Doc # 6.02.01 Page 101
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DA 40 Series

Trouble  Possible Cause  Repair 
No audio on pilot’s head-set with the intercom or audio panel switched OFF.  Faulty head-set. Open audio line.  Replace head-set. Do a test of the head-set audio wiring. Refer to Chapter 92 for the wiring diagrams. 
No audio on co-pilot’s or passenger headsets.  Open audio line. Faulty intercom or audio panel.  Do a test of the head-set audio wiring. Refer to Chapter 92 for the wiring diagrams. Replace the intercom or audio panel. 

Page 102 Doc # 6.02.01 09 Jan 2003 Rev. 4
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Communications
AMM

B. Audio Selector Functions
% This paragraph applies to the KMA 28 and GMA 340 audio panels.
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DA 40 Series

Trouble  Possible Cause  Repair 
Audio selector panel does not operate.  Audio panel switched OFF. Circuit breaker pulled. Defective wiring. Faulty audio panel.  Switch audio panel ON. Re-set circuit breaker. Do a continuity test of the related wires. Replace defective wires. Repair or replace audio panel. 
No audio signal in head-set.  Faulty head-set. Faulty head-set socket. Defective wiring between audio panel and head-set socket. Faulty audio panel.  Replace head-set. Replace head-set socket. Do a continuity test of the related wires. Replace defective wires. Repair or replace audio panel. 
　
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